diff --git a/openapi.yaml b/openapi.yaml
index 3804f18b..3a01537f 100644
--- a/openapi.yaml
+++ b/openapi.yaml
@@ -44,6 +44,8 @@ tags:
     description: Turn audio into text or text into audio.
   - name: Chat
     description: Given a list of messages comprising a conversation, the model will return a response.
+  - name: Messages
+    description: Anthropic-native Messages API. Send a structured list of input messages and receive a response. Supported on Anthropic, AWS Bedrock, Google Vertex AI, and Azure AI Foundry (Anthropic models).
   - name: Realtime
     description: WebSocket proxy for provider Realtime APIs
   - name: Collections
@@ -320,6 +322,204 @@ paths:
 
             main();
 
+  /messages:
+    servers: *DataPlaneServers
+    post:
+      operationId: createMessage
+      tags:
+        - Messages
+      summary: Messages
+      description: |
+        Anthropic-native Messages API. Send a structured list of input messages with text, image, or document content and receive a response from Claude.
+
+        This endpoint proxies the [Anthropic Messages API](https://docs.anthropic.com/en/api/messages) and supports all Claude-compatible providers:
+        - **Anthropic** (direct)
+        - **AWS Bedrock** (Claude models)
+        - **Google Vertex AI** (Claude models)
+        - **Azure AI Foundry** (Anthropic models) — set `azure_foundry_url` in your provider to `https://{resource}.services.ai.azure.com/anthropic`
+
+        Native Anthropic features like extended thinking, prompt caching, streaming with `x-portkey-*` headers, and tool use are all fully supported.
+      parameters:
+        - $ref: "#/components/parameters/PortkeyTraceId"
+        - $ref: "#/components/parameters/PortkeySpanId"
+        - $ref: "#/components/parameters/PortkeyParentSpanId"
+        - $ref: "#/components/parameters/PortkeySpanName"
+        - $ref: "#/components/parameters/PortkeyMetadata"
+      requestBody:
+        required: true
+        content:
+          application/json:
+            schema:
+              $ref: "#/components/schemas/CreateMessageRequest"
+      responses:
+        "200":
+          description: OK
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/CreateMessageResponse"
+      security:
+        - Portkey-Key: []
+          Virtual-Key: []
+        - Portkey-Key: []
+          Provider-Auth: []
+          Provider-Name: []
+        - Portkey-Key: []
+          Config: []
+        - Portkey-Key: []
+          Provider-Auth: []
+          Provider-Name: []
+          Custom-Host: []
+
+      x-code-samples:
+        - lang: cURL
+          label: Anthropic Direct
+          source: |
+            curl https://api.portkey.ai/v1/messages \
+              -H "Content-Type: application/json" \
+              -H "x-portkey-api-key: $PORTKEY_API_KEY" \
+              -H "x-portkey-virtual-key: $PORTKEY_PROVIDER_VIRTUAL_KEY" \
+              -d '{
+                "model": "claude-sonnet-4-6-20251101",
+                "max_tokens": 1024,
+                "messages": [
+                  {
+                    "role": "user",
+                    "content": "Hello, Claude!"
+                  }
+                ]
+              }'
+        - lang: cURL
+          label: Azure AI Foundry (Anthropic)
+          source: |
+            curl https://api.portkey.ai/v1/messages \
+              -H "Content-Type: application/json" \
+              -H "x-portkey-api-key: $PORTKEY_API_KEY" \
+              -d '{
+                "model": "@your-azure-foundry-anthropic-provider/your-azure-deployment-name",
+                "max_tokens": 1024,
+                "messages": [
+                  {
+                    "role": "user",
+                    "content": "Hello, Claude!"
+                  }
+                ]
+              }'
+        - lang: python
+          label: Anthropic SDK via Portkey
+          source: |
+            import anthropic
+
+            client = anthropic.Anthropic(
+                api_key="dummy",
+                default_headers={"x-portkey-api-key": "YOUR_PORTKEY_API_KEY"},
+                base_url="https://api.portkey.ai"
+            )
+
+            message = client.messages.create(
+                model="@your-provider/your-deployment",
+                max_tokens=1024,
+                messages=[
+                    {"role": "user", "content": "Hello, Claude!"}
+                ]
+            )
+            print(message.content)
+        - lang: javascript
+          label: Anthropic SDK via Portkey
+          source: |
+            import Anthropic from "@anthropic-ai/sdk";
+
+            const client = new Anthropic({
+              apiKey: "dummy",
+              defaultHeaders: { "x-portkey-api-key": "YOUR_PORTKEY_API_KEY" },
+              baseURL: "https://api.portkey.ai",
+            });
+
+            const message = await client.messages.create({
+              model: "@your-provider/your-deployment",
+              max_tokens: 1024,
+              messages: [{ role: "user", content: "Hello, Claude!" }],
+            });
+
+            console.log(message.content);
+
+  /messages/count_tokens:
+    servers: *DataPlaneServers
+    post:
+      operationId: countMessageTokens
+      tags:
+        - Messages
+      summary: Count Message Tokens
+      description: |
+        Count the number of tokens that will be used by a Messages API request before actually sending it to Claude. Useful for cost estimation and staying within context window limits.
+
+        Supported on the same providers as the `/messages` endpoint: Anthropic, AWS Bedrock, Google Vertex AI, and Azure AI Foundry (Anthropic models).
+      parameters:
+        - $ref: "#/components/parameters/PortkeyTraceId"
+        - $ref: "#/components/parameters/PortkeySpanId"
+        - $ref: "#/components/parameters/PortkeyParentSpanId"
+        - $ref: "#/components/parameters/PortkeySpanName"
+        - $ref: "#/components/parameters/PortkeyMetadata"
+      requestBody:
+        required: true
+        content:
+          application/json:
+            schema:
+              $ref: "#/components/schemas/CountMessageTokensRequest"
+      responses:
+        "200":
+          description: OK
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/CountMessageTokensResponse"
+      security:
+        - Portkey-Key: []
+          Virtual-Key: []
+        - Portkey-Key: []
+          Provider-Auth: []
+          Provider-Name: []
+        - Portkey-Key: []
+          Config: []
+        - Portkey-Key: []
+          Provider-Auth: []
+          Provider-Name: []
+          Custom-Host: []
+
+      x-code-samples:
+        - lang: cURL
+          label: Default
+          source: |
+            curl https://api.portkey.ai/v1/messages/count_tokens \
+              -H "Content-Type: application/json" \
+              -H "x-portkey-api-key: $PORTKEY_API_KEY" \
+              -H "x-portkey-virtual-key: $PORTKEY_PROVIDER_VIRTUAL_KEY" \
+              -d '{
+                "model": "claude-sonnet-4-6-20251101",
+                "messages": [
+                  {
+                    "role": "user",
+                    "content": "Hello, Claude!"
+                  }
+                ]
+              }'
+        - lang: python
+          label: Default
+          source: |
+            import anthropic
+
+            client = anthropic.Anthropic(
+                api_key="dummy",
+                default_headers={"x-portkey-api-key": "YOUR_PORTKEY_API_KEY"},
+                base_url="https://api.portkey.ai"
+            )
+
+            response = client.messages.count_tokens(
+                model="@your-provider/your-deployment",
+                messages=[{"role": "user", "content": "Hello, Claude!"}]
+            )
+            print(response.input_tokens)
+
   /realtime:
     servers: *DataPlaneServers
     get:
@@ -20410,6 +20610,8 @@ paths:
       summary: Get requests graph
       parameters:
         - $ref: "#/components/parameters/WorkspaceSlug"
+        - $ref: "#/components/parameters/IncludeAllWorkspaces"
+        - $ref: "#/components/parameters/ExcludeWorkspaceSlugs"
         - $ref: "#/components/parameters/TimeOfGenerationMin"
         - $ref: "#/components/parameters/TimeOfGenerationMax"
         - $ref: "#/components/parameters/TotalUnitsMin"
@@ -20486,6 +20688,8 @@ paths:
       summary: Get cost graph
       parameters:
         - $ref: "#/components/parameters/WorkspaceSlug"
+        - $ref: "#/components/parameters/IncludeAllWorkspaces"
+        - $ref: "#/components/parameters/ExcludeWorkspaceSlugs"
         - $ref: "#/components/parameters/TimeOfGenerationMin"
         - $ref: "#/components/parameters/TimeOfGenerationMax"
         - $ref: "#/components/parameters/TotalUnitsMin"
@@ -20570,6 +20774,8 @@ paths:
       summary: Get latency graph
       parameters:
         - $ref: "#/components/parameters/WorkspaceSlug"
+        - $ref: "#/components/parameters/IncludeAllWorkspaces"
+        - $ref: "#/components/parameters/ExcludeWorkspaceSlugs"
         - $ref: "#/components/parameters/TimeOfGenerationMin"
         - $ref: "#/components/parameters/TimeOfGenerationMax"
         - $ref: "#/components/parameters/TotalUnitsMin"
@@ -20671,6 +20877,8 @@ paths:
       summary: Get tokens graph
       parameters:
         - $ref: "#/components/parameters/WorkspaceSlug"
+        - $ref: "#/components/parameters/IncludeAllWorkspaces"
+        - $ref: "#/components/parameters/ExcludeWorkspaceSlugs"
         - $ref: "#/components/parameters/TimeOfGenerationMin"
         - $ref: "#/components/parameters/TimeOfGenerationMax"
         - $ref: "#/components/parameters/TotalUnitsMin"
@@ -20755,6 +20963,8 @@ paths:
       summary: Get users graph. Returns unique user count across different time buckets
       parameters:
         - $ref: "#/components/parameters/WorkspaceSlug"
+        - $ref: "#/components/parameters/IncludeAllWorkspaces"
+        - $ref: "#/components/parameters/ExcludeWorkspaceSlugs"
         - $ref: "#/components/parameters/TimeOfGenerationMin"
         - $ref: "#/components/parameters/TimeOfGenerationMax"
         - $ref: "#/components/parameters/TotalUnitsMin"
@@ -20831,6 +21041,8 @@ paths:
       summary: Get users requests graph. Returns average requests per user across different time buckets
       parameters:
         - $ref: "#/components/parameters/WorkspaceSlug"
+        - $ref: "#/components/parameters/IncludeAllWorkspaces"
+        - $ref: "#/components/parameters/ExcludeWorkspaceSlugs"
         - $ref: "#/components/parameters/TimeOfGenerationMin"
         - $ref: "#/components/parameters/TimeOfGenerationMax"
         - $ref: "#/components/parameters/TotalUnitsMin"
@@ -20915,6 +21127,8 @@ paths:
       summary: Get errors graph
       parameters:
         - $ref: "#/components/parameters/WorkspaceSlug"
+        - $ref: "#/components/parameters/IncludeAllWorkspaces"
+        - $ref: "#/components/parameters/ExcludeWorkspaceSlugs"
         - $ref: "#/components/parameters/TimeOfGenerationMin"
         - $ref: "#/components/parameters/TimeOfGenerationMax"
         - $ref: "#/components/parameters/TotalUnitsMin"
@@ -20991,6 +21205,8 @@ paths:
       summary: Get percentage error rate graph
       parameters:
         - $ref: "#/components/parameters/WorkspaceSlug"
+        - $ref: "#/components/parameters/IncludeAllWorkspaces"
+        - $ref: "#/components/parameters/ExcludeWorkspaceSlugs"
         - $ref: "#/components/parameters/TimeOfGenerationMin"
         - $ref: "#/components/parameters/TimeOfGenerationMax"
         - $ref: "#/components/parameters/TotalUnitsMin"
@@ -21067,6 +21283,8 @@ paths:
       summary: Get status code wise stacked error graph
       parameters:
         - $ref: "#/components/parameters/WorkspaceSlug"
+        - $ref: "#/components/parameters/IncludeAllWorkspaces"
+        - $ref: "#/components/parameters/ExcludeWorkspaceSlugs"
         - $ref: "#/components/parameters/TimeOfGenerationMin"
         - $ref: "#/components/parameters/TimeOfGenerationMax"
         - $ref: "#/components/parameters/TotalUnitsMin"
@@ -21166,6 +21384,8 @@ paths:
         - $ref: "#/components/parameters/VirtualKeys"
         - $ref: "#/components/parameters/Configs"
         - $ref: "#/components/parameters/WorkspaceSlug"
+        - $ref: "#/components/parameters/IncludeAllWorkspaces"
+        - $ref: "#/components/parameters/ExcludeWorkspaceSlugs"
         - $ref: "#/components/parameters/ApiKeyIds"
         - $ref: "#/components/parameters/Metadata"
         - $ref: "#/components/parameters/AiOrgModel"
@@ -21230,6 +21450,8 @@ paths:
       summary: Get retry and fallback rescued requests graph
       parameters:
         - $ref: "#/components/parameters/WorkspaceSlug"
+        - $ref: "#/components/parameters/IncludeAllWorkspaces"
+        - $ref: "#/components/parameters/ExcludeWorkspaceSlugs"
         - $ref: "#/components/parameters/TimeOfGenerationMin"
         - $ref: "#/components/parameters/TimeOfGenerationMax"
         - $ref: "#/components/parameters/TotalUnitsMin"
@@ -21322,6 +21544,8 @@ paths:
       summary: Get cache hit rate graph
       parameters:
         - $ref: "#/components/parameters/WorkspaceSlug"
+        - $ref: "#/components/parameters/IncludeAllWorkspaces"
+        - $ref: "#/components/parameters/ExcludeWorkspaceSlugs"
         - $ref: "#/components/parameters/TimeOfGenerationMin"
         - $ref: "#/components/parameters/TimeOfGenerationMax"
         - $ref: "#/components/parameters/TotalUnitsMin"
@@ -21418,6 +21642,8 @@ paths:
       summary: Get cache hit latency graph
       parameters:
         - $ref: "#/components/parameters/WorkspaceSlug"
+        - $ref: "#/components/parameters/IncludeAllWorkspaces"
+        - $ref: "#/components/parameters/ExcludeWorkspaceSlugs"
         - $ref: "#/components/parameters/TimeOfGenerationMin"
         - $ref: "#/components/parameters/TimeOfGenerationMax"
         - $ref: "#/components/parameters/TotalUnitsMin"
@@ -21488,6 +21714,8 @@ paths:
       summary: Get feedbacks graph
       parameters:
         - $ref: "#/components/parameters/WorkspaceSlug"
+        - $ref: "#/components/parameters/IncludeAllWorkspaces"
+        - $ref: "#/components/parameters/ExcludeWorkspaceSlugs"
         - $ref: "#/components/parameters/TimeOfGenerationMin"
         - $ref: "#/components/parameters/TimeOfGenerationMax"
         - $ref: "#/components/parameters/TotalUnitsMin"
@@ -21564,6 +21792,8 @@ paths:
       summary: Get score-wise feedbacks distribution graph
       parameters:
         - $ref: "#/components/parameters/WorkspaceSlug"
+        - $ref: "#/components/parameters/IncludeAllWorkspaces"
+        - $ref: "#/components/parameters/ExcludeWorkspaceSlugs"
         - $ref: "#/components/parameters/TimeOfGenerationMin"
         - $ref: "#/components/parameters/TimeOfGenerationMax"
         - $ref: "#/components/parameters/TotalUnitsMin"
@@ -21639,6 +21869,8 @@ paths:
       summary: Get weighted feedbacks graph. Weighted feedback is (value * score)
       parameters:
         - $ref: "#/components/parameters/WorkspaceSlug"
+        - $ref: "#/components/parameters/IncludeAllWorkspaces"
+        - $ref: "#/components/parameters/ExcludeWorkspaceSlugs"
         - $ref: "#/components/parameters/TimeOfGenerationMin"
         - $ref: "#/components/parameters/TimeOfGenerationMax"
         - $ref: "#/components/parameters/TotalUnitsMin"
@@ -21715,6 +21947,8 @@ paths:
       summary: Get feedbacks per ai_models graph
       parameters:
         - $ref: "#/components/parameters/WorkspaceSlug"
+        - $ref: "#/components/parameters/IncludeAllWorkspaces"
+        - $ref: "#/components/parameters/ExcludeWorkspaceSlugs"
         - $ref: "#/components/parameters/TimeOfGenerationMin"
         - $ref: "#/components/parameters/TimeOfGenerationMax"
         - $ref: "#/components/parameters/TotalUnitsMin"
@@ -21788,6 +22022,8 @@ paths:
       summary: Get cache summary data for the selected time period
       parameters:
         - $ref: "#/components/parameters/WorkspaceSlug"
+        - $ref: "#/components/parameters/IncludeAllWorkspaces"
+        - $ref: "#/components/parameters/ExcludeWorkspaceSlugs"
         - $ref: "#/components/parameters/TimeOfGenerationMin"
         - $ref: "#/components/parameters/TimeOfGenerationMax"
         - $ref: "#/components/parameters/TotalUnitsMin"
@@ -21854,6 +22090,8 @@ paths:
       summary: Get metadata users grouped data.
       parameters:
         - $ref: "#/components/parameters/WorkspaceSlug"
+        - $ref: "#/components/parameters/IncludeAllWorkspaces"
+        - $ref: "#/components/parameters/ExcludeWorkspaceSlugs"
         - $ref: "#/components/parameters/TimeOfGenerationMin"
         - $ref: "#/components/parameters/TimeOfGenerationMax"
         - $ref: "#/components/parameters/TotalUnitsMin"
@@ -21928,6 +22166,8 @@ paths:
       summary: Get ai model grouped data.
       parameters:
         - $ref: "#/components/parameters/WorkspaceSlug"
+        - $ref: "#/components/parameters/IncludeAllWorkspaces"
+        - $ref: "#/components/parameters/ExcludeWorkspaceSlugs"
         - $ref: "#/components/parameters/TimeOfGenerationMin"
         - $ref: "#/components/parameters/TimeOfGenerationMax"
         - $ref: "#/components/parameters/TotalUnitsMin"
@@ -21999,6 +22239,8 @@ paths:
       summary: Get provider grouped data.
       parameters:
         - $ref: "#/components/parameters/WorkspaceSlug"
+        - $ref: "#/components/parameters/IncludeAllWorkspaces"
+        - $ref: "#/components/parameters/ExcludeWorkspaceSlugs"
         - $ref: "#/components/parameters/TimeOfGenerationMin"
         - $ref: "#/components/parameters/TimeOfGenerationMax"
         - $ref: "#/components/parameters/TotalUnitsMin"
@@ -22082,6 +22324,8 @@ paths:
             type: string
           required: true
         - $ref: "#/components/parameters/WorkspaceSlug"
+        - $ref: "#/components/parameters/IncludeAllWorkspaces"
+        - $ref: "#/components/parameters/ExcludeWorkspaceSlugs"
         - $ref: "#/components/parameters/TimeOfGenerationMin"
         - $ref: "#/components/parameters/TimeOfGenerationMax"
         - $ref: "#/components/parameters/TotalUnitsMin"
@@ -23565,6 +23809,19 @@ components:
       schema:
         type: string
       description: Workspace slug filter. If a workspace API key is being used, this filter will not be taken into consideration. If an organisation API key is used and no workspace slug is passed, default workspace will be used.
+    IncludeAllWorkspaces:
+      in: query
+      name: include_all_workspaces
+      schema:
+        type: boolean
+      description: When `true`, returns data aggregated across all workspaces in the organisation. Only takes effect for organisation API keys; ignored for workspace API keys, which are already scoped to a single workspace. Do not combine with `workspace_slug` — if `workspace_slug` is present, it takes precedence and this parameter is ignored. One of `workspace_slug`, `include_all_workspaces`, or `exclude_workspace_slugs` is required.
+    ExcludeWorkspaceSlugs:
+      in: query
+      name: exclude_workspace_slugs
+      schema:
+        type: string
+      description: Comma separated workspace slugs to exclude. Behaves like `include_all_workspaces` (aggregates across all workspaces) but filters out the listed slugs. Only takes effect for organisation API keys; ignored for workspace API keys. Do not combine with `workspace_slug` — if `workspace_slug` is present, it takes precedence and this parameter is ignored. One of `workspace_slug`, `include_all_workspaces`, or `exclude_workspace_slugs` is required.
+      example: ws-legacy,ws-archived
     ApiKeyIds:
       in: query
       name: api_key_ids
@@ -23702,6 +23959,403 @@ components:
         type: string
 
   schemas:
+    # -------------------------------------------------------------------------
+    # Anthropic Messages API schemas
+    # -------------------------------------------------------------------------
+
+    AnthropicTextContent:
+      type: object
+      required:
+        - type
+        - text
+      properties:
+        type:
+          type: string
+          enum: [text]
+        text:
+          type: string
+
+    AnthropicImageSource:
+      type: object
+      required:
+        - type
+      properties:
+        type:
+          type: string
+          enum: [base64, url]
+        media_type:
+          type: string
+          enum: [image/jpeg, image/png, image/gif, image/webp]
+          description: Required when type is base64.
+        data:
+          type: string
+          description: Base64-encoded image data. Required when type is base64.
+        url:
+          type: string
+          description: URL of the image. Required when type is url.
+
+    AnthropicImageContent:
+      type: object
+      required:
+        - type
+        - source
+      properties:
+        type:
+          type: string
+          enum: [image]
+        source:
+          $ref: "#/components/schemas/AnthropicImageSource"
+
+    AnthropicDocumentSource:
+      type: object
+      required:
+        - type
+      properties:
+        type:
+          type: string
+          enum: [base64, url, text, content]
+        media_type:
+          type: string
+          enum: [application/pdf, text/plain]
+          description: Required when type is base64.
+        data:
+          type: string
+          description: Base64-encoded document data. Required when type is base64.
+        url:
+          type: string
+          description: URL of the document. Required when type is url.
+        text:
+          type: string
+          description: Plain text content. Required when type is text.
+
+    AnthropicDocumentContent:
+      type: object
+      required:
+        - type
+        - source
+      properties:
+        type:
+          type: string
+          enum: [document]
+        source:
+          $ref: "#/components/schemas/AnthropicDocumentSource"
+        title:
+          type: string
+        context:
+          type: string
+        citations:
+          type: object
+          properties:
+            enabled:
+              type: boolean
+
+    AnthropicToolUseContent:
+      type: object
+      required:
+        - type
+        - id
+        - name
+        - input
+      properties:
+        type:
+          type: string
+          enum: [tool_use]
+        id:
+          type: string
+        name:
+          type: string
+        input:
+          type: object
+
+    AnthropicToolResultContent:
+      type: object
+      required:
+        - type
+        - tool_use_id
+      properties:
+        type:
+          type: string
+          enum: [tool_result]
+        tool_use_id:
+          type: string
+        content:
+          oneOf:
+            - type: string
+            - type: array
+              items:
+                oneOf:
+                  - $ref: "#/components/schemas/AnthropicTextContent"
+                  - $ref: "#/components/schemas/AnthropicImageContent"
+        is_error:
+          type: boolean
+
+    AnthropicThinkingContent:
+      type: object
+      required:
+        - type
+        - thinking
+        - signature
+      properties:
+        type:
+          type: string
+          enum: [thinking]
+        thinking:
+          type: string
+        signature:
+          type: string
+
+    AnthropicRedactedThinkingContent:
+      type: object
+      required:
+        - type
+        - data
+      properties:
+        type:
+          type: string
+          enum: [redacted_thinking]
+        data:
+          type: string
+
+    AnthropicContentBlock:
+      oneOf:
+        - $ref: "#/components/schemas/AnthropicTextContent"
+        - $ref: "#/components/schemas/AnthropicImageContent"
+        - $ref: "#/components/schemas/AnthropicDocumentContent"
+        - $ref: "#/components/schemas/AnthropicToolUseContent"
+        - $ref: "#/components/schemas/AnthropicToolResultContent"
+        - $ref: "#/components/schemas/AnthropicThinkingContent"
+        - $ref: "#/components/schemas/AnthropicRedactedThinkingContent"
+
+    AnthropicMessage:
+      type: object
+      required:
+        - role
+        - content
+      properties:
+        role:
+          type: string
+          enum: [user, assistant]
+        content:
+          oneOf:
+            - type: string
+            - type: array
+              items:
+                $ref: "#/components/schemas/AnthropicContentBlock"
+
+    AnthropicSystemContent:
+      oneOf:
+        - type: string
+          description: Plain text system prompt.
+        - type: array
+          items:
+            type: object
+            required:
+              - type
+              - text
+            properties:
+              type:
+                type: string
+                enum: [text]
+              text:
+                type: string
+              cache_control:
+                type: object
+                properties:
+                  type:
+                    type: string
+                    enum: [ephemeral]
+
+    AnthropicTool:
+      type: object
+      required:
+        - name
+        - input_schema
+      properties:
+        name:
+          type: string
+        description:
+          type: string
+        input_schema:
+          type: object
+          description: JSON Schema for the tool input.
+        cache_control:
+          type: object
+          properties:
+            type:
+              type: string
+              enum: [ephemeral]
+
+    AnthropicThinkingConfig:
+      type: object
+      required:
+        - type
+      properties:
+        type:
+          type: string
+          enum: [enabled, disabled, adaptive]
+        budget_tokens:
+          type: integer
+          description: Max tokens for thinking. Required when type is enabled.
+
+    CreateMessageRequest:
+      type: object
+      required:
+        - model
+        - messages
+        - max_tokens
+      description: |
+        Request body for the Anthropic-native Messages API (`POST /v1/messages`).
+
+        For Azure AI Foundry (Anthropic models), set your provider's `azure_foundry_url` to
+        `https://{resource}.services.ai.azure.com/anthropic` (strip the path to `/anthropic`).
+        Use the deployment name as the `model` value (or `@provider/deployment` format with Portkey).
+      properties:
+        model:
+          type: string
+          description: |
+            The model identifier. When using Portkey's provider/virtual-key routing, use the
+            `@provider-slug/deployment-name` format (e.g., `@my-azure-foundry-provider/my-claude-deployment`).
+          example: "claude-sonnet-4-6-20251101"
+        messages:
+          type: array
+          items:
+            $ref: "#/components/schemas/AnthropicMessage"
+          description: List of input messages forming the conversation.
+        max_tokens:
+          type: integer
+          description: Maximum number of tokens to generate in the response.
+          example: 1024
+        system:
+          $ref: "#/components/schemas/AnthropicSystemContent"
+          description: Optional system prompt.
+        stream:
+          type: boolean
+          default: false
+          description: Set to true to stream the response using server-sent events.
+        temperature:
+          type: number
+          minimum: 0
+          maximum: 1
+          description: Sampling temperature between 0 and 1.
+        top_p:
+          type: number
+          description: Nucleus sampling probability.
+        top_k:
+          type: integer
+          description: Top-K sampling value.
+        stop_sequences:
+          type: array
+          items:
+            type: string
+          description: Custom stop sequences.
+        tools:
+          type: array
+          items:
+            $ref: "#/components/schemas/AnthropicTool"
+          description: Tool definitions available to the model.
+        tool_choice:
+          type: object
+          description: Controls which tool the model uses.
+          properties:
+            type:
+              type: string
+              enum: [auto, any, tool, none]
+            name:
+              type: string
+              description: Required when type is tool.
+        thinking:
+          $ref: "#/components/schemas/AnthropicThinkingConfig"
+          description: Extended thinking configuration.
+        metadata:
+          type: object
+          properties:
+            user_id:
+              type: string
+
+    AnthropicUsage:
+      type: object
+      properties:
+        input_tokens:
+          type: integer
+        output_tokens:
+          type: integer
+        cache_creation_input_tokens:
+          type: integer
+        cache_read_input_tokens:
+          type: integer
+
+    CreateMessageResponse:
+      type: object
+      properties:
+        id:
+          type: string
+        type:
+          type: string
+          enum: [message]
+        role:
+          type: string
+          enum: [assistant]
+        model:
+          type: string
+        content:
+          type: array
+          items:
+            $ref: "#/components/schemas/AnthropicContentBlock"
+        stop_reason:
+          type: string
+          enum: [end_turn, max_tokens, stop_sequence, tool_use, pause_turn]
+        stop_sequence:
+          type: string
+          nullable: true
+        usage:
+          $ref: "#/components/schemas/AnthropicUsage"
+
+    CountMessageTokensRequest:
+      type: object
+      required:
+        - model
+        - messages
+      description: |
+        Request body for the Anthropic token counting endpoint (`POST /v1/messages/count_tokens`).
+        Returns the number of input tokens that a Messages API call would consume, without actually
+        calling the model.
+      properties:
+        model:
+          type: string
+          description: The model identifier (same format as CreateMessageRequest).
+          example: "claude-sonnet-4-6-20251101"
+        messages:
+          type: array
+          items:
+            $ref: "#/components/schemas/AnthropicMessage"
+        system:
+          $ref: "#/components/schemas/AnthropicSystemContent"
+        tools:
+          type: array
+          items:
+            $ref: "#/components/schemas/AnthropicTool"
+        tool_choice:
+          type: object
+          properties:
+            type:
+              type: string
+              enum: [auto, any, tool, none]
+            name:
+              type: string
+        thinking:
+          $ref: "#/components/schemas/AnthropicThinkingConfig"
+
+    CountMessageTokensResponse:
+      type: object
+      properties:
+        input_tokens:
+          type: integer
+          description: The number of input tokens that would be consumed by the corresponding Messages API call.
+
+    # -------------------------------------------------------------------------
+    # End Anthropic Messages API schemas
+    # -------------------------------------------------------------------------
+
     ModelPricingConfig:
       type: object
       description: Complete pricing configuration for a model
@@ -41098,6 +41752,27 @@ x-code-samples:
         - type: object
           key: CreateChatCompletionStreamResponse
           path: streaming
+    - id: messages
+      title: Messages
+      description: |
+        Anthropic-native Messages API. Use with Anthropic, AWS Bedrock, Google Vertex AI, and
+        Azure AI Foundry (Anthropic models).
+
+        For Azure AI Foundry, set `azure_foundry_url` in your provider to
+        `https://{resource}.services.ai.azure.com/anthropic` (strip to `/anthropic`, not `/anthropic/v1/messages`).
+
+        Related guide: [Anthropic Messages API](https://docs.anthropic.com/en/api/messages)
+      navigationGroup: endpoints
+      sections:
+        - type: endpoint
+          key: createMessage
+          path: create
+        - type: endpoint
+          key: countMessageTokens
+          path: count-tokens
+        - type: object
+          key: CreateMessageResponse
+          path: object
     - id: realtime
       title: Realtime
       description: |