Choosing a Model (Anthropic Claude)

Testronaut supports Anthropic Claude models for agentic browser workflows, including native tool calls and screenshots.

Setup

Select Anthropic Claude during initialization:

testronaut --init

Add your API key to .env:

ANTHROPIC_API_KEY=sk-ant-...

The generated configuration uses the canonical provider ID anthropic:

{
  "provider": "anthropic",
  "model": "claude-sonnet-5"
}

Model	Best for
`claude-sonnet-5`	Recommended balance of capability, latency, and cost
`claude-opus-5`	Most demanding workflows and deeper reasoning
`claude-haiku-4-5`	Fast, cost-conscious smoke tests and larger suites

Model access and rate limits depend on your Anthropic account. Testronaut forwards the selected model ID directly to the Anthropic Messages API.

testronaut --provider=anthropic --model=claude-opus-5

--provider=claude is accepted as a convenience alias. Environment overrides work too:

TESTRONAUT_PROVIDER=anthropic TESTRONAUT_MODEL=claude-haiku-4-5 testronaut

The selected provider and model are included in local and uploaded reports.