OpenRouter

Anthropic has launched Claude Fable 5.2, positioned as its model for the most ambitious technical work and a step above Opus 5.5 on most evals. It delivers up to 30% faster output than Fable 5.1 at $8/M input and $40/M output with a 1M context window, and is now live on OpenRouter. Anthropic reports 69.9% on FrontierSWE v2, 89.3% on OSWorld 2.1 and 74.2% on Humanity's Last Exam with tools.

Meta's Muse Ember is now available on OpenRouter, positioned as a sub-task execution model for coding agents. The suggested pattern uses a frontier planner such as Muse Wonder to decompose work, then fans bounded sub-tasks out to Muse Ember for parallel execution. No parameter counts, benchmarks, or pricing details were disclosed.