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Claude Fable 5.1 API: Model ID, Rates, Effort and Cache TTL

This story is from 2026-09-06. It is preserved in the archive; the latest stories are on the live feed.

Claude Fable 5.1 API: Model ID, Rates, Effort and Cache TTL Claude Fable 5.1 shipped on 1 September 2026. This post is the reference: the identifiers, the five published rates, and the cache-TTL choice that costs more than the price cut saves. For the cost argument against Opus 5, see Fable 5.1 vs…

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  1. 2026-09-06 00:33 · DEV Community — AI
    Claude Fable 5.1 API: Model ID, Rates, Effort and Cache TTL

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