AILenny's Newsletterabout 3 hours ago
Claude Fable 5 review: Mythos model tested
9 min read
Anthropic released Claude Fable 5, its first generally available Mythos-class model, hitting 80% on SWBench Pro and outperforming Opus 4.8, GPT-4.5, and Gemini 3.1 Pro. The model costs $10 per million input tokens and $50 per million output tokens, consuming tokens at roughly twice the rate of other models.
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