AISimon Willison5 days ago
Initial impressions of Claude Fable 5
10 min read
Anthropic released Claude Fable 5, matching Claude Mythos 5 performance but with stricter safety classifiers that trigger often. The model costs $10 per million input tokens and $50 per million output tokens, with a 1 million token context window and 128,000 maximum output tokens. The API includes automatic fallback to another model when requests are rejected.
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