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HomeDocsClaude Code CLI 14 Oct 2026
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Claude Code on Amazon Bedrock changedamazon-bedrock

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Upstream edited this page at 14 Oct 2026 02:36 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 14 Oct 2026 02:37 UTC.

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193193 
194194#### Credential caching and resolution timeout
195195 
196Claude Code resolves the AWS default credential provider chain once and keeps the resolved credentials in memory. It reuses them until five minutes before they expire, or for one hour when they carry no expiration, so an SSO-backed profile requests credentials from IAM Identity Center about once per credential lifetime. A credential error from the API clears the cache, and the retry resolves fresh credentials. Requires Claude Code v2.1.207 or later.
196Claude Code resolves the AWS default credential provider chain once and keeps the resolved credentials in memory. It reuses them until five minutes before they expire, or for one hour when they carry no expiration, so an SSO-backed profile requests credentials from IAM Identity Center about once per credential lifetime. A credential error from the API clears the cache, and the retry resolves fresh credentials.
197197 
198198The cache covers every credential method listed at the start of this step except an Amazon Bedrock API key, which doesn't use the provider chain. To resolve the chain on every request instead, set [`CLAUDE_CODE_SKIP_AWS_CRED_CACHE=1`](/docs/en/env-vars).
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244244 
245245`Expiration` is optional. When the command returns a valid ISO 8601 `Expiration`, Claude Code caches the credentials until five minutes before that time. Without it, credentials are cached for one hour.
246246 
247When you configure `awsCredentialExport` without `awsAuthRefresh`, Claude Code uses the exported credentials directly and doesn't re-resolve the AWS default credential provider chain at startup. Requires Claude Code v2.1.206 or later.
247When you configure `awsCredentialExport` without `awsAuthRefresh`, Claude Code uses the exported credentials directly and doesn't re-resolve the AWS default credential provider chain at startup.
248248 
249249### 3. Configure Claude Code
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322322* 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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324324<Warning>
325 Opus models have a higher per-token price than Sonnet models, so a deployment that doesn't pin a primary model is billed at the Opus rate once it updates to v2.1.207 or later. To keep Sonnet 4.5 as the primary model, set `ANTHROPIC_MODEL` to its full model ID. A deployment that steers the default with `ANTHROPIC_DEFAULT_SONNET_MODEL` and doesn't set `ANTHROPIC_DEFAULT_OPUS_MODEL` keeps its steered Sonnet model as the default.
325 Opus models have a higher per-token price than Sonnet models, so if you don't pin a primary model, you're billed at the Opus rate. To use Sonnet 4.5 as the primary model, set `ANTHROPIC_MODEL` to its full model ID. A deployment that steers the default with `ANTHROPIC_DEFAULT_SONNET_MODEL` and doesn't set `ANTHROPIC_DEFAULT_OPUS_MODEL` keeps its steered Sonnet model as the default.
326326</Warning>
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328Before v2.1.280, the primary model on Amazon Bedrock defaulted to Opus 5 and the `opus` alias resolved to Opus 5 from v2.1.219. On v2.1.207 through v2.1.218, the primary model on Amazon Bedrock defaulted to Opus 4.8 and the `opus` alias resolved to Opus 4.8. Before v2.1.207, the primary model defaulted to Sonnet 4.5, the `opus` alias resolved to Opus 4.6, and background tasks always used the primary model.
328Before v2.1.280, the primary model on Amazon Bedrock defaulted to Opus 5 and the `opus` alias resolved to Opus 5 from v2.1.219. On v2.1.207 through v2.1.218, the primary model on Amazon Bedrock defaulted to Opus 4.8 and the `opus` alias resolved to Opus 4.8.
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330330To customize models further, use one of these methods:
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