Anthropic Launches Claude Fable 5 to the Public with 95% on SWE-bench Verified and Charges Double that of Opus 4.8
The first model in the Mythos class available to the public arrives at the API for $10 per million input tokens and $50 for output, achieving 80.3% on SWE-bench Pro compared to 58.6% for GPT-5.5.