Claude Code on Amazon Bedrock changedamazon-bedrock
Nearest release: v2.1.317, published 2 hours before upstream edited the page. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.
Upstream edited this page at 3 Nov 2026 02:14 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 3 Nov 2026 02:37 UTC.
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### Start a session on a specific model ### Remembered model refusals
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311311* A pin in the `env` block of [managed settings](https://code.claude.com/docs/en/managed-settings.md)
312312* 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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314If the update prompt still appears for a pin in managed settings, update Claude Code to v2.1.314 or later. Before v2.1.314, the managed pin stayed in effect after you accepted, so the prompt came back at the next start.
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314316If 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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318### Start a session on a specific model
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316320When 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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318322These don't act as pins when you start a session on them:
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320324* A model alias such as `opus`
321325* A model ID Claude Code doesn't recognize, such as an application inference profile ARN
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323When 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).
327### Remembered model refusals
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329When the startup model checks find a model your account can't invoke, Claude Code can remember the refusal on this machine for up to a day. Once ten minutes have passed since the last check, Claude Code checks a remembered refusal of a current default model again at launch. A default your administrator re-enables then 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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325331### When your organization enforces a model allowlist
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