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Models

Use provider/model. Browser Use Pi uses upstream Pi’s pinned model catalog and transports; it does not fork the model loop or silently substitute models.

Example Environment variable
openrouter/openai/gpt-5.6-luna OPENROUTER_API_KEY
openrouter/openai/gpt-6-astra OPENROUTER_API_KEY
openrouter/anthropic/claude-opus-5 OPENROUTER_API_KEY
anthropic/claude-sonnet-4-6 ANTHROPIC_API_KEY

Provider access depends on your account. A catalog entry is not proof of entitlement. Screenshot interpretation requires a vision model.

const agent = await BrowserUse.create({
  model: 'openrouter/openai/gpt-5.6-luna',
  reasoning: 'xhigh',
});

Reasoning levels depend on the model. Inspect builtinModels() or supply models for a new endpoint/catalog. Advanced callers can override streamFn.

Opus 5 / OpenRouter: Pi 0.85.1’s Messages route sends an unsupported mid-conversation effort update. The default SDK resolution uses OpenRouter’s /api/v1 completions transport for this exact model. Caller-supplied models collections are left untouched. Remove this compatibility patch when Pi’s upstream route is fixed.

Usage and costs come from the configured model catalog. They are estimates, not invoices. maxCostUsd is checked between turns and may overshoot by one response.