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HomeDocsClaude Code CLI 24 Sep 2026
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Claude Code on Amazon Bedrock changedamazon-bedrock

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Upstream edited this page at 24 Sep 2026 23:34 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 28 Sep 2026 23:37 UTC.

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278278To keep the built-in default models and change only their preferred prefix, set [`ANTHROPIC_BEDROCK_REGION_PREFIX`](#cross-region-inference-profile-prefixes) instead of pinning. The difference shows in what the `opus` alias resolves to:
279279 
280| You set | The `opus` alias resolves to |
281| :------------------------------------------------------------ | :------------------------------------------------------------------------------ |
282| `ANTHROPIC_DEFAULT_OPUS_MODEL='us.anthropic.claude-opus-4-8'` | `us.anthropic.claude-opus-4-8`, the exact ID you pinned |
283| `ANTHROPIC_BEDROCK_REGION_PREFIX=eu` | `eu.anthropic.claude-opus-5-5`, the built-in default with your preferred prefix |
280| You set | The `opus` alias resolves to |
281| :- | :- |
282| `ANTHROPIC_DEFAULT_OPUS_MODEL='us.anthropic.claude-opus-4-8'` | `us.anthropic.claude-opus-4-8`, the exact ID you pinned |
283| `ANTHROPIC_BEDROCK_REGION_PREFIX=eu` | `eu.anthropic.claude-opus-5-5`, the built-in default with your preferred prefix |
284284 
285285For current and legacy model IDs, see [Models overview](https://platform.claude.com/docs/en/about-claude/models/overview). For the full list of pinning environment variables, see [Model configuration](/docs/en/model-config#pin-models-for-third-party-deployments).
286286 
287287Claude Code uses these default models when no pinning variables are set:
288288 
289| Model type | Default model |
290| :--------------- | :---------------------------------------------------------------------------------------- |
291| Primary model | Opus 5.5, for example `us.anthropic.claude-opus-5-5` in a `us-*` region |
289| Model type | Default model |
290| :- | :- |
291| Primary model | Opus 5.5, for example `us.anthropic.claude-opus-5-5` in a `us-*` region |
292292| Small/fast model | Sonnet 4.5, for example `us.anthropic.claude-sonnet-4-5-20250929-v1:0` in a `us-*` region |
293293 
294294Background tasks such as session title generation use the small/fast model, normally a Haiku-class model. On Amazon Bedrock, Claude Code uses the default Sonnet model for background tasks because Haiku may not be enabled in every account or region. Two selections change which model carries them:
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358358 
359359On the Amazon Bedrock [Invoke API](https://docs.aws.amazon.com/bedrock/latest/APIReference/API_runtime_InvokeModelWithResponseStream.html), Claude Code resolves its built-in default models to [cross-region inference profile](https://docs.aws.amazon.com/bedrock/latest/userguide/inference-profiles-support.html) IDs; to route model versions through your own inference profiles instead, see [Map each model version to an inference profile](#map-each-model-version-to-an-inference-profile). This table shows the prefix Claude Code prefers for each resolved AWS region:
360360 
361| AWS region | Prefix |
362| :------------------------ | :-------- |
361| AWS region | Prefix |
362| :- | :- |
363363| `us-gov-*` (AWS GovCloud) | `us-gov.` |
364| `us-*` | `us.` |
365| `eu-*` | `eu.` |
366| `ap-*` | `apac.` |
367| All other regions | `global.` |
364| `us-*` | `us.` |
365| `eu-*` | `eu.` |
366| `ap-*` | `apac.` |
367| All other regions | `global.` |
368368 
369369Set `ANTHROPIC_BEDROCK_REGION_PREFIX` to choose the prefix Claude Code tries first; when Claude Code can check profile availability and finds no matching profile for a model, it falls back as described in the resolution order below. Valid values are `us`, `eu`, `apac`, `jp`, `au`, and `global`. For example, set it to `global` when your account has `global.` profiles enabled but Claude Code would derive a geography-specific one from your AWS region. Requires Claude Code v2.1.224 or later.
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538538 
539539These variables are specific to the Mantle endpoint. See [Environment variables](/docs/en/env-vars) for the full list.
540540 
541| Variable | Purpose |
542| :-------------------------------------- | :------------------------------------------------------------------------- |
543| `CLAUDE_CODE_USE_MANTLE` | Enable the Mantle endpoint. Set to `1` or `true`. |
544| `ANTHROPIC_BEDROCK_MANTLE_BASE_URL` | Override the default Mantle endpoint URL |
545| `CLAUDE_CODE_SKIP_MANTLE_AUTH` | Skip client-side authentication for proxy setups |
541| Variable | Purpose |
542| :- | :- |
543| `CLAUDE_CODE_USE_MANTLE` | Enable the Mantle endpoint. Set to `1` or `true`. |
544| `ANTHROPIC_BEDROCK_MANTLE_BASE_URL` | Override the default Mantle endpoint URL |
545| `CLAUDE_CODE_SKIP_MANTLE_AUTH` | Skip client-side authentication for proxy setups |
546546| `ANTHROPIC_SMALL_FAST_MODEL_AWS_REGION` | Override AWS region for the Haiku-class model (shared with Amazon Bedrock) |
547547 
548548## Troubleshooting
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