Setup
- Get an API key from console.anthropic.com.
- Set the environment variable:
export ANTHROPIC_API_KEY="sk-ant-..."
Configuration
agents:
root:
model: anthropic/claude-sonnet-4-0
models:
claude:
provider: anthropic
model: claude-sonnet-4-0
max_tokens: 64000
agents:
root:
model: claude
Available models
| Model | Best for |
|---|
claude-sonnet-4-5 | Most capable, extended thinking |
claude-sonnet-4-0 | Strong coding, balanced performance |
Thinking budget
Anthropic uses an integer token budget. The value must be between 1024 and 32768 and must be less than max_tokens. Defaults to 8192 with interleaved thinking enabled.
models:
claude-deep:
provider: anthropic
model: claude-sonnet-4-5
max_tokens: 64000
thinking_budget: 16384 # must be < max_tokens
Thinking budget values below 1024 or greater than or equal to max_tokens are ignored and a warning is logged.
models:
claude:
provider: anthropic
model: claude-sonnet-4-5
thinking_budget: 0
Interleaved thinking
Interleaved thinking allows the model to call tools during its reasoning process, enabling tighter integration between thinking and action. It is enabled by default.
models:
claude:
provider: anthropic
model: claude-sonnet-4-5
provider_opts:
interleaved_thinking: false # disable if needed