Chetaslua(@chetaslua):🚨 Claude Fable 5.1 is rolling out RIGHT NOW claude-fable-5-1 + claude-mythos-5-1 inside claude code 2.1.257, pushed to npm today knowledge cutoff June 2026 1M context, $10/$50, cache reads down to $0.25 support article live in french, german, japanese and spanish but the english one isn't published yet Anti Distillation "Preserved thinking" - the api will now reject your request if you edit context before a thinking block.

Chetaslua

@chetaslua

AI researcher & reporter | I test new models on launch day, build working demos, and post prompts + results | Code:

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Chetaslua@chetaslua

2026.09.01 17:52

🚨 Claude Fable 5.1 is rolling out RIGHT NOW claude-fable-5-1 + claude-mythos-5-1 inside claude code 2.1.257, pushed to npm today knowledge cutoff June 2026 1M context, $10/$50, cache reads down to $0.25 support article live in french, german, japanese and spanish but the english one isn't published yet Anti Distillation "Preserved thinking" - the api will now reject your request if you edit context before a thinking block.