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622622 * **`fallback-credit-*`:** keep this header on both requests. The retry needs it to redeem the token.
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624624 <Note>
625 On models that include the 1M token context window by default, such as Claude Fable 5.1, Claude Fable 5, Claude Opus 5, and Claude Opus 4.8, the `context-1m-2025-08-07` beta header has no effect. To keep the two requests identical, omit that header on both rather than sending it on one and not the other.
625 On models that include the 1M token context window by default, such as Claude Fable 5.1, Claude Fable 5, Claude Opus 5.5, Claude Opus 5, and Claude Opus 4.8, the `context-1m-2025-08-07` beta header has no effect. To keep the two requests identical, omit that header on both rather than sending it on one and not the other.
626626 </Note>
627627</Accordion>
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