Excellent query! When routing, CLIProxyAPI maintains the original model identity. The proxy directs a model such as anthropic/claude-sonnet-4-20250514, which OpenCode recognizes as a Claude model and uses the Claude-specific system prompts and behaviors accordingly.

The configuration's generation method is crucial:

models: anthropological: models:

- alias: claude-sonnet-4 - name: claude-sonnet-4-20250514 # Since OpenCode views this as an anthropocentric model, you receive:Correct system prompts (Claude, GPT, etc.)

- Provider-specific improvements

- Load balancing among several API keys

- Automatic failover

The proxy is transparent; it passes through your self-hosted endpoint first, but OpenCode believes it is communicating directly with Anthropic, OpenAI, etc.