For AI agents: a documentation index is available at the root level at /llms.txt and /llms-full.txt. Append /llms.txt to any URL for a page-level index, or .md for the markdown version of any page.
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Changelog

A daily log of product changes, improvements, and new model releases on OpenRouter
April 7, 2026
April 7, 2026

Product changes

  • Model compare benchmarks — The model compare page now includes Artificial Analysis and Design Arena benchmark scores for side-by-side evaluation.
  • Request caching for Messages API — The /messages endpoint now supports request caching. See Response Caching docs.
  • Sticky compare selectors — Model selectors on the compare page are now sticky with removal buttons for a smoother multi-model comparison experience.

New models

  • Anthropic: Claude Opus 4.6 (Fast)
  • Z.ai: GLM 5.1
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