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.
ModelsChatRankingsDocs
DocsAPI ReferenceClient SDKsAgent SDKCookbookChangelog
DocsAPI ReferenceClient SDKsAgent SDKCookbookChangelog

Changelog

A daily log of product changes, improvements, and new model releases on OpenRouter
April 3, 2026
April 3, 2026

Product changes

  • Anthropic compaction — Compaction support through the API when using Anthropic models. Used by tools to enable automatic context window management for long conversations.

New models

  • Google: Gemma 4 26B A4B
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