Added fast mode for Claude Fable 5.2 in Messages API, enabled by setting speed:"fast".
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LLM APIs updates in 2026-w46
Launch of Claude Fable 5.2 and Claude Mythos 5.2 with 1 M‑token context, 128 k output, lower pricing ($8/$40 per MTok vs $10/$50) and availability on API, AWS, Google Cloud, Bedrock, and Microsoft Foundry.