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173173| `ANTHROPIC_SMALL_FAST_MODEL` | \[DEPRECATED] Name of [Haiku-class model for background tasks](/docs/en/costs) |
174174| `ANTHROPIC_SMALL_FAST_MODEL_AWS_REGION` | Override AWS region for the Haiku-class model when using Amazon Bedrock or Amazon Bedrock Mantle. On Amazon Bedrock, this only takes effect when `ANTHROPIC_DEFAULT_HAIKU_MODEL` or the deprecated `ANTHROPIC_SMALL_FAST_MODEL` is also set, since Amazon Bedrock otherwise runs background tasks on the [default Sonnet model or the primary model](/docs/en/amazon-bedrock#4-pin-model-versions) in the session region |
175175| `ANTHROPIC_VERTEX_BASE_URL` | Override Google Cloud's Agent Platform endpoint URL. Use for custom Google Cloud's Agent Platform endpoints or when routing through an [LLM gateway](/docs/en/llm-gateway). See [Google Cloud's Agent Platform](/docs/en/google-vertex-ai) |
176| `ANTHROPIC_VERTEX_PROJECT_ID` | GCP project ID for Google Cloud's Agent Platform requests. Overridden by `GCLOUD_PROJECT`, `GOOGLE_CLOUD_PROJECT`, or the project in your `GOOGLE_APPLICATION_CREDENTIALS` credential file. See [Google Cloud's Agent Platform](/docs/en/google-vertex-ai) |
176| `ANTHROPIC_VERTEX_PROJECT_ID` | GCP project ID that Google Cloud's Agent Platform requests are addressed to. See [Configure GCP credentials](/docs/en/google-vertex-ai#3-configure-gcp-credentials) |
177177| `ANTHROPIC_WORKSPACE_ID` | Workspace ID for [workload identity federation](https://platform.claude.com/docs/en/manage-claude/workload-identity-federation). Set this when your federation rule is scoped to more than one workspace so the token exchange knows which workspace to target |
178178| `API_FORCE_IDLE_TIMEOUT` | Override the 5-minute body idle timeout that aborts a streaming model response when no bytes arrive. Set to `0` to turn the timeout off, for example when a slow [gateway](/docs/en/llm-gateway) or local model pauses longer than 5 minutes between chunks, or `1` to keep it on for every provider. When unset, the timeout is active on providers other than the direct Anthropic API and [Claude Platform on AWS](/docs/en/claude-platform-on-aws). The [stream watchdogs](/docs/en/network-config#streaming-idle-watchdogs) run independently of it and abort a long silent pause even when you set `0` here |
179179| `API_TIMEOUT_MS` | Timeout for API requests in milliseconds (default: 600000, or 10 minutes; maximum: 2147483647). Increase this when requests time out on slow networks or when routing through a proxy. Values above the maximum overflow the underlying timer and cause requests to fail immediately |