Claude Code on Amazon Bedrock changedamazon-bedrock
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305305When Claude Code starts with Amazon Bedrock configured, it verifies that the models it intends to use are accessible in your account.
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307If you have pinned a model version that is older than the current Claude Code default, and your account can invoke the newer version, Claude Code prompts you to update the pin. Accepting writes the new model ID to your [user settings file](https://code.claude.com/docs/en/settings.md) and restarts Claude Code. Declining is remembered until the next default version change. Pins that point to an [application inference profile ARN](#map-each-model-version-to-an-inference-profile) are skipped, since those are managed by your administrator.
307You may have pinned a model version that is older than the current Claude Code default. If your account can invoke the newer version, Claude Code prompts you to update the pin. Accepting writes the new model ID to your [user settings file](https://code.claude.com/docs/en/settings.md) and restarts Claude Code. Declining is remembered until the next default version change.
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309Claude Code doesn't check or prompt for these pins:
310
311* A pin in the `env` block of [managed settings](https://code.claude.com/docs/en/managed-settings.md)
312* A pin that points to an [application inference profile ARN](#map-each-model-version-to-an-inference-profile), because your administrator manages it
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309314If 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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311316When you start the session on a specific Sonnet or Opus version, for example with `--model`, `ANTHROPIC_MODEL`, or the [`model` setting](https://code.claude.com/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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313Model 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.
318These don't act as pins when you start a session on them:
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320* A model alias such as `opus`
321* A model ID Claude Code doesn't recognize, such as an application inference profile ARN
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315323When these checks find a model your account can't invoke, Claude Code remembers the refusal on this machine for up to a day, and launches during that time skip the remembered model without asking Amazon Bedrock again. Claude Code checks a remembered refusal of a current default model again at launch once ten minutes have passed since the last check, so a default your administrator re-enables comes back. To turn the memory off, set [`CLAUDE_CODE_SKIP_MODEL_ACCESS_MEMORY=1`](https://code.claude.com/docs/en/env-vars).
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