aider/aider/website/docs/llms/openrouter.md

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Connecting to LLMs	500

OpenRouter

Aider can connect to models provided by OpenRouter: You'll need an OpenRouter API key.

python -m pip install -U aider-chat

export OPENROUTER_API_KEY=<key> # Mac/Linux
setx   OPENROUTER_API_KEY <key> # Windows, restart shell after setx

# Or any other open router model
aider --model openrouter/<provider>/<model>

# List models available from OpenRouter
aider --list-models openrouter/

In particular, many aider users access Sonnet via OpenRouter:

python -m pip install -U aider-chat

export OPENROUTER_API_KEY=<key> # Mac/Linux
setx   OPENROUTER_API_KEY <key> # Windows, restart shell after setx

aider --model openrouter/anthropic/claude-3.5-sonnet

{: .tip } If you get errors, check your OpenRouter privacy settings. Be sure to "enable providers that may train on inputs" to allow use of all models.

Controlling provider selection

You can control which OpenRouter providers are used by creating a .aider.model.settings.yml file in your home directory or project root. See Advanced model settings for more details about model settings files. For example:

- name: openrouter/anthropic/claude-3.5-sonnet
  extra_params:
    provider:
      # Only use these providers, in this order
      order: ["Anthropic", "Together"]
      # Don't fall back to other providers
      allow_fallbacks: false
      # Skip providers that may train on inputs
      data_collection: "deny"
      # Only use providers supporting all parameters
      require_parameters: true

See OpenRouter's provider routing docs for full details on these settings.