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HomeDocsClaude Code CLI 20 Aug 2026
One change · claude-code

Claude Code on Amazon Bedrock changedamazon-bedrock

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290290Background 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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292* When you select a primary model with `--model`, `ANTHROPIC_MODEL`, or the `model` setting, background tasks use that model. Setting `ANTHROPIC_DEFAULT_OPUS_MODEL` without `ANTHROPIC_DEFAULT_SONNET_MODEL` counts as a selection too, because the built-in Sonnet model may not be enabled in an account that steers its own Opus.
292* When you select a primary model with `--model`, `ANTHROPIC_MODEL`, or the `model` setting, background tasks use that model. When Claude Code starts the session on the model you set with [`ANTHROPIC_DEFAULT_MODEL`](/docs/en/model-config#set-a-default-model-for-new-sessions), background tasks use that model too. Setting `ANTHROPIC_DEFAULT_OPUS_MODEL` without `ANTHROPIC_DEFAULT_SONNET_MODEL` also counts as a selection, because the built-in Sonnet model may not be enabled in an account that steers its own Opus.
293293* To use Haiku for background tasks, set `ANTHROPIC_DEFAULT_HAIKU_MODEL` to a model ID that is available in your account.
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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, 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), 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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