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 21, 2026
April 21, 2026
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Product changes

  • Throughput metrics — Added tokens/second throughput metrics to the Activity Explorer.
  • View Logs shortcut — Activity page filters now include a “View Logs” link that passes your current filters through to the logs view.
  • Date range filter options — Added “Past hour” and “Past 24 hours” quick filter options to the date range picker.
  • Guardrails on API key detail — The API key detail page now shows guardrail configuration.
  • Logs refresh indicator — The refresh button on the Activity page now shows a spinning icon while loading.
  • web_fetch server tool — Re-added the openrouter:web_fetch server tool for fetching web content during inference.

New models

  • OpenAI: GPT-5.4 Image 2
  • Pareto Code Router
  • inclusionAI: Ling-2.6-flash