A: In OpenClaw, the default model for Anthropic (or any provider) is not tied to the API key itself. Instead, it is explicitly configured in the agent’s settings via agents.defaults.model.primary. For example, you might set it to anthropic/claude-sonnet-4-5 or anthropic/claude-opus-4-5, depending on your preference.

The ANTHROPIC_API_KEY (or stored credentials in auth-profiles.json) only enables authentication to the Anthropic API. It does not dictate the model. If you see the error No credentials found for profile "anthropic:default", it means the Gateway couldn’t locate the API key in the expected location (e.g., missing or misconfigured credentials in the auth profile).

Key steps to resolve:

1. Verify credentials: Ensure the Anthropic API key is correctly stored in auth-profiles.json under the relevant profile (e.g., anthropic:default).
2. Specify the model: Explicitly set agents.defaults.model.primary to your desired Anthropic model (e.g., anthropic/claude-sonnet-4-5).
3. Restart the Gateway: After updating the config, restart the Gateway to apply changes.

If the model is not specified, OpenClaw may default to a generic or fallback model, but this depends on your configuration. Always explicitly define the model to avoid ambiguity.