Choosing a model

The default is Claude Opus 5.5 at high effort, chosen by the review eval: it found the most known issues, with almost no false alarms. For less cost, model: claude-sonnet-5-5 with effort: low was as good on simple changes and missed a little more on complex ones. Claude Haiku 4.5 isn’t recommended: half its comments were wrong.

Provider	Key (CLI environment variable)	Notes
anthropic	ANTHROPIC_API_KEY	The default
mistral	MISTRAL_API_KEY	Defaults to codestral-latest
openai	OPENAI_API_KEY	Name a model
openrouter	OPENROUTER_API_KEY	Name a model
openai-compatible	--api-key-env	Any OpenAI-compatible endpoint: set base-url and a model
ollama	none	A model on your own machine (CLI only; see below)

In the Action, set provider, and model where the table says to name one, with that provider’s key as a secret. For Mistral:

      - uses: sgtwickool/codemop@v1
        with:
          provider: mistral
          api-key: ${{ secrets.MISTRAL_API_KEY }}