This bug was reported in the OpenHands/OpenHands project, but the latest comment suggest a problem with

reasoning_content

at the SDK level when using deepseek v4-pro https://github.com/OpenHands/OpenHands/issues/14347 Has a few users following / commenting on it.

Hey @millions-crayon-32880 I think it's OK to start working on deepseek support if you have time now, since we're getting close to getting all of the tier 1 models supported. Assigned this to you AGE-1534: [Bug]: DeepSeek v4-pro/v4-flash compatibility issues (model list, provider routing, reasoning_content)