Claude Code's /model picker showed fake 'Claude Sonnet/Opus/Haiku' because /v1/models returned the static Anthropic catalog and the launch command did not enable discovery. With the Auto Router on, /v1/models now advertises the real backend models (autorouter tier targets + managed backend catalogs + model_list), and a model picked from the picker routes straight to its backend (explicit pick wins over tier signals). claude-* alias traffic still flows through the configured tiers.
- /v1/models: real models when router enabled; static Anthropic catalog fallback otherwise
- explicit-pick deferral in /v1/messages and /v1/chat/completions (AppState::resolve_explicit_pick)
- CLAUDE_CODE_ENABLE_GATEWAY_MODEL_DISCOVERY=true in the Auto Router copy-command and the README/CLI launch instructions
- tests: unit (push_model_row, RouterConfig::active_tiers) + integration (explicit_pick beats think tier)
Co-Authored-By: Claude <noreply@anthropic.com>
whit3rabbitandClaude