Claude Code on Google Cloud's Agent Platform changedgoogle-vertex-ai
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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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193193* **If you accept**: Claude Code writes the new model ID to your [user settings file](https://code.claude.com/docs/en/settings.md) and restarts
194194* **If you decline**: Claude Code remembers your choice until the next default version change
195195
196For a pin in the `env` block of [managed settings](https://code.claude.com/docs/en/managed-settings.md), Claude Code runs no check and shows no prompt.
196For a pin in the `env` block of [managed settings](https://code.claude.com/docs/en/managed-settings.md), Claude Code runs no check and shows no prompt. If the update prompt still appears for this pin, 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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198198If you have not pinned a model and the current default is unavailable in your project, 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 [Model Garden](https://console.cloud.google.com/vertex-ai/model-garden) or [pin a version](#5-pin-model-versions) to make the choice permanent.
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200### Start a session on a specific model
201
200202When 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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202Model aliases such as `opus` don't act as pins, and neither does a model ID Claude Code doesn't recognize.
204When you start a session on a model alias such as `opus` or on a model ID Claude Code doesn't recognize, that value doesn't act as a pin.
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204When these checks find a model your project 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 Agent Platform 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).
206### Remembered model refusals
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208When the startup model checks find a model your project 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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206210### When your organization enforces a model allowlist
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