Errors with Deepseek models

[designermonkey]

What happened?

I don't know if this is something I've done wrong or something else, so I thought I should post it here.

Using deepseek/deepseek-v4-flash over Openrouter, I keep getting this:

Error: 400 Provider returned error
 {"code":20015,"message":"The `reasoning_content` in the thinking mode must be passed back to the API.","data":null}

Steps to reproduce

Just leave the model doing reasoning and thinking about a task.

Expected behavior

Not sure... Not getting an error?

Version

0.70.x

[github-actions]

This issue was auto-closed. All issues from new contributors are auto-closed by default.
Issues submitted Friday through Sunday are not reviewed. If this is urgent, ask on Discord: https://discord.com/invite/3cU7Bz4UPx

Maintainers review auto-closed issues daily and reopen worthwhile ones. Issues that do not meet the quality bar in CONTRIBUTING.md will not be reopened or receive a reply.

If a maintainer replies lgtmi on one of your issues, your future issues will stay open. If a maintainer replies lgtm, your future issues and PRs will stay open.

See CONTRIBUTING.md.

[aguspiza]

{
  "id": "deepseek/deepseek-v4-flash",
  "reasoning": true,
  "compat": {
    "requiresReasoningContentOnAssistantMessages": true,
    "thinkingFormat": "deepseek"
  }
}

[pyfisch]

I still get this error when running the latest version of pi. Messages work fine for a bit, but if I don't send messages for a few minutes and then continue the session I see this error.

I think this only happens with openrouter and the siliconflow provider. This isn't confirmed yet as I need to test the other providers more. Still sucks, because siliconflow is fast and the others are a lot slower.