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Sweep 22 Oct 2026 · 04:32Z Build v2.1.308 527 read Stable v2.1.308 Latest v2.1.308 Next v2.1.308 Feeds RSS JSON llms.txt llms-full.txt Unofficial
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fallback-credit changedbuild-with-claude/fallback-credit

Nearest release: v2.1.308, published 2 hours after this site recorded the change. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.

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77Prompt caches are per-model. When a model declines a request and you retry on another model, the conversation prefix already cached for the first model must be written into the new model's cache in full. Cache writes cost more than cache reads. Fallback credit removes that extra cost. The refusal carries a credit token, you echo the token on the retry, and the retry is billed as though the conversation had been on the new model from the start.
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9You need this page only when you build the retry yourself: over raw HTTP or with custom retry logic. [Server-side fallback](https://platform.claude.com/docs/en/build-with-claude/refusals-and-fallback#server-side-fallback) and the [SDK middleware](https://platform.claude.com/docs/en/build-with-claude/refusals-and-fallback#client-side-fallback) apply fallback credit automatically. If you use either, skip this page.
9You need this page only when you build the retry yourself: over raw HTTP or with custom retry logic. [Server-side fallback](https://platform.claude.com/docs/en/build-with-claude/refusals-and-fallback#server-side-fallback) and [client-side fallback with the SDK middleware](https://platform.claude.com/docs/en/build-with-claude/refusals-and-fallback#client-side-fallback) apply fallback credit automatically. If you use either, skip this page.
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1111[Refusals and fallback](https://platform.claude.com/docs/en/build-with-claude/refusals-and-fallback) covers detecting refusals and choosing a fallback approach. [Prompt caching](https://platform.claude.com/docs/en/build-with-claude/prompt-caching) explains cache reads and cache writes if those terms are new.
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