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Fable 5.1 and Opus 5 now support changing the effort level without invalidating the cache, as least through the API platform.claude.com/docs/en/buil...

1/9/26, 6:39 pm1 repost31 likes

Axialis

@axialis.com

2 Sept

That makes effort escalation much more practical. Have you measured the cost difference over a long agent session?