Reconnecting error with deepseek api

[ervin3]

stream disconnected before completion: Provider error 400: {"error":{"message":"The reasoning_content in the thinking mode must be passed back to the API.","type":"invalid_request_error","param":null,"code":"invalid_request_error"}}

[ervin3]

i think it might be subagents setup.

[Ingwannu]

Thanks for the report. This is very likely the DeepSeek V4 thinking-mode history rule surfacing during a tool/subagent continuation.

DeepSeek V4 thinking mode returns reasoning_content on assistant messages and expects that field to be sent back on later multi-turn/tool-call requests. opencodex already had model-scoped support for replaying reasoning_content, but the built-in DeepSeek preset did not mark the V4 thinking models for that behavior, so a continuation turn could drop the field and DeepSeek would reject the request with the 400 you saw.

I opened #61 to address this. The PR:

• adds deepseek-v4-pro / deepseek-v4-flash to the DeepSeek preset
• marks those V4 thinking models for reasoning_content history replay
• maps Codex xhigh to DeepSeek max
• keeps the older deepseek-reasoner behavior unchanged

This should cover the subagent/tool-call path because the test now verifies an assistant message carrying both reasoning_content and tool_calls is replayed correctly.

[Ingwannu]

Merged the fix into dev via #61. Closing this for now; please reopen or comment if the DeepSeek reconnect error still reproduces after updating.