PR #3726 fixed stale codex_responses persisting when switching providers
by hardcoding api_mode=chat_completions in 5 model flows. This broke
MiniMax, MiniMax-CN, and Alibaba which use /anthropic endpoints that
need anthropic_messages — the hardcoded value overrides the URL-based
auto-detection in runtime_provider.py.
Fix: pop api_mode from config in the 3 URL-dependent flows (custom
endpoint, Kimi, api_key_provider) instead of hardcoding. The runtime
resolver already correctly auto-detects api_mode from the base_url
suffix (/anthropic -> anthropic_messages, else chat_completions).
OpenRouter and Copilot ACP flows keep the explicit value since their
api_mode is always known.
Reported by stefan171.
981e14001c