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Claude Code gateway compatibility guide changedllm-gateway-protocol

Nearest release: v2.1.322, published 17 hours before upstream edited the page. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.

Upstream edited this page at 10 Nov 2026 19:39 UTC, give or take a minute or two: the time comes from Anthropic’s own sitemap rather than from a commit. This site recorded the change at 10 Nov 2026 20:07 UTC.

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3636 
3737| Format | Selected by | Endpoints | Forward unchanged |
3838| :- | :- | :- | :- |
39| Anthropic Messages | `ANTHROPIC_BASE_URL` | `/v1/messages`, `/v1/messages/count_tokens` (optional) | `anthropic-beta` and `anthropic-version` request headers |
39| Anthropic Messages | `ANTHROPIC_BASE_URL` | `/v1/messages`, `/v1/messages/count_tokens` (optional) | `anthropic-beta` and `anthropic-version` request headers, plus `Authorization` when a [claude.ai login](#request-headers) authenticates the request to Anthropic |
4040| Amazon Bedrock InvokeModel | `ANTHROPIC_BEDROCK_BASE_URL` with `CLAUDE_CODE_USE_BEDROCK=1` | `/model/{model}/invoke`, `/model/{model}/invoke-with-response-stream`, `/model/{model}/count-tokens` (optional) | `anthropic_beta` and `anthropic_version` request body fields |
4141| Google Cloud's Agent Platform rawPredict | `ANTHROPIC_VERTEX_BASE_URL` with `CLAUDE_CODE_USE_VERTEX=1` | `:rawPredict`, `:streamRawPredict`, `count-tokens:rawPredict` (optional) | `anthropic-beta` and `anthropic-version` request headers, and the `anthropic_version` request body field |
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111111 
112112## Request headers
113113 
114Claude Code includes these headers on API requests. Header names are case-insensitive on the wire. Forward `anthropic-version` and `anthropic-beta` unchanged, plus `anthropic-workspace-id` when the upstream is the [Claude Platform on AWS](https://code.claude.com/docs/en/claude-platform-on-aws.md); the rest the gateway may consume for routing, attribution, and tracing, and need not forward.
114Claude Code includes these headers on API requests. Header names are case-insensitive on the wire. Forward `anthropic-version` and `anthropic-beta` unchanged, plus `anthropic-workspace-id` when the upstream is the [Claude Platform on AWS](https://code.claude.com/docs/en/claude-platform-on-aws.md). Also forward `Authorization` when your gateway authenticates to Anthropic with the developer's claude.ai login and not a key of its own. The rest the gateway may consume for routing, attribution, and tracing, and need not forward.
115115 
116116| Header | Description |
117117| :- | :- |
118| `Authorization`, `x-api-key` | The developer's gateway credential, in one or both headers depending on which [credential variable](https://code.claude.com/docs/en/llm-gateway-connect.md#set-the-credential-variable) they set |
118| `Authorization`, `x-api-key` | The developer's gateway credential, in one or both headers depending on which [credential variable](https://code.claude.com/docs/en/llm-gateway-connect.md#set-the-credential-variable) they set. With a claude.ai login and no gateway credential, `Authorization` carries the login's token |
119119| `anthropic-version` | API version, currently `2023-06-01`. Amazon Bedrock- and Google Cloud's Agent Platform-format requests also carry the `anthropic_version` body field, whose value is the provider dialect string, not this header's value |
120120| `anthropic-beta` | Comma-separated capability values for the request. Forward the header verbatim; don't allowlist individual values, because the set changes with Claude Code releases. When the developer authenticates with a claude.ai login, which is possible when `ANTHROPIC_BASE_URL` is set without a gateway credential variable, this header also carries an OAuth capability that the upstream requires, and stripping it fails those requests with `401` |
121121| `x-claude-code-session-id` | A unique identifier for the current Claude Code session. Use it to aggregate all requests from one session without parsing request bodies |
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