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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DocsAPI ReferenceClient SDKsAgent SDKCookbookChangelog
  • Overview
    • Quickstart
    • Principles
    • Models
    • Stripe Projects
    • FAQ
    • Report Feedback
  • Models & Routing
    • Model Fallbacks
    • Provider Selection
    • Auto Exacto
    • Private Models
      • Free
      • Extended
      • Exacto
      • Thinking
      • Online
      • Nitro
  • Features
    • Workspaces
    • Presets
    • Response Caching
    • Tool Calling
    • Structured Outputs
    • Message Transforms
    • Zero Completion Insurance
    • ZDR
    • App Attribution
    • Service Tiers
    • Sovereign AI
    • Router Metadata
    • Input & Output Logging
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  • Usage
  • Details
  • Related Resources
Models & RoutingModel Variants

Free Variant

Access free models with the :free variant

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Extended Variant

Extended context windows with :extended

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Built with

The :free variant allows you to access free versions of models on OpenRouter.

Usage

Append :free to any model ID:

1{
2  "model": "meta-llama/llama-3.2-3b-instruct:free"
3}

Details

Free variants provide access to models without cost, but may have different rate limits or availability compared to paid versions.

Related Resources

  • Free Models Router - Learn how to use the Free Models Router in the Chat Playground for zero-cost inference