Claude Code on Amazon Bedrock changedamazon-bedrock
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322322#### Map each model version to an inference profile
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324The `ANTHROPIC_DEFAULT_*_MODEL` environment variables configure one inference profile per model family. If your organization needs to expose several versions of the same family in the `/model` picker, each routed to its own application inference profile ARN, use the `modelOverrides` setting in your [settings file](/docs/en/settings#settings-files) instead.
324The `ANTHROPIC_DEFAULT_*_MODEL` environment variables configure one inference profile per model family. If your organization needs to expose several versions of the same family in the `/model` picker, each routed to its own application inference profile ARN, use the `modelOverrides` setting in your [settings file](/docs/en/settings#where-settings-live) instead.
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326326This example maps four Opus versions to distinct ARNs so users can switch between them without bypassing your organization's inference profiles:
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347347If you have not pinned a model and the current default is unavailable in your account, Claude Code falls back for the current session and shows a notice. It tries earlier versions of the default model first and, when the default is an Opus model and no Opus version is available, falls back to the default Sonnet model. The fallback is not persisted. Enable the newer model in your Amazon Bedrock account or [pin a version](#4-pin-model-versions) to make the choice permanent.
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349When you start the session on a specific Sonnet or Opus version, for example with `--model`, `ANTHROPIC_MODEL`, or the [`model` setting](/docs/en/settings), that version acts as the session's pinned default for the matching `sonnet` or `opus` alias. Claude Code skips the availability check for the built-in default your model replaces and starts on the model you configured, with no fallback notice.
349When you start the session on a specific Sonnet or Opus version, for example with `--model`, `ANTHROPIC_MODEL`, or the [`model` setting](/docs/en/settings-reference#model), that version acts as the session's pinned default for the matching `sonnet` or `opus` alias. Claude Code skips the availability check for the built-in default your model replaces and starts on the model you configured, with no fallback notice.
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351351Model aliases such as `opus` don't act as pins, and neither does a model ID Claude Code doesn't recognize, such as an application inference profile ARN.
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