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
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ModelsChatRankingsDocs

Changelog

A daily log of product changes, improvements, and new model releases on OpenRouter
April 24, 2026
April 24, 2026
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Product changes

  • Compare page redesign — New breadcrumbs, preset pills, layout, suggestions, and inline API link on the Compare page.
  • Guardrails column on API keys — API keys list view now shows which guardrails are attached to each key.
  • SDK docs reorganization — SDK documentation split into separate Client SDKs and Agent SDK tabs.
  • Agent TUI guide — New guide for building your own agent TUI.
  • Theme: system default — OpenRouter now defaults to the system theme, respecting your OS dark/light preference.
  • DeepSeek V4 tool history fix — Fixed native tool history preservation for DeepSeek V4 thinking + tools.
  • Chatroom: audio model filter — Audio output models are now filtered from the chatroom model selector.
  • Duplicate SSE error chunk fix — Fixed duplicate terminal error chunks when upstream providers send multiple error SSEs.

New models

  • OpenAI: GPT-5.5
  • OpenAI: GPT-5.5 Pro
  • DeepSeek: DeepSeek V4 Pro
  • DeepSeek: DeepSeek V4 Flash
  • Google: Gemini 3.1 Flash TTS Preview
  • Google: Veo 3.1 Fast