GPT 5.5 - reoccurring 'message' was provided without its required 'reasoning' item

Before submitting your bug report

• I've tried using the "Ask AI" feature on the Continue docs site to see if the docs have an answer
• I'm not able to find a related conversation on GitHub discussions that reports the same bug
• I'm not able to find an open issue that reports the same bug
• I've seen the troubleshooting guide on the Continue Docs

Relevant environment info

- OS: WSL 2
- Continue version: 1.2.22
- IDE version: 1.124.2 (Visual Studio Code)
- Model: GPT 5.5 (Open AI apki key)
- config:
  
  - name: GPT-5.5
    provider: openai
    model: gpt-5.5
    apiKey: sk-proj-
    defaultCompletionOptions:
      promptCaching: true

Description

It's not always, just sometimes but Resubmit last message doesnt' help. After several click GPT 5.5 I guess chooses different approach and the error disappers. I have no problem with Opus 4.6, so it might be model related.

here is error output:

Error handling model response

{"message":"Item 'msg_07ddda73bf133ab6006a2cfd8e30f481a3b33726a611ef9119' of type 'message' was provided without its required 'reasoning' item: 'rs_07ddda73bf133ab6006a2cfd8bb24881a3b60b5630fce8f932'.","type":"invalid_request_error","param":"input","code":null}

To reproduce

No response

Log output

Start from the reported model-response error and trace the GPT-5.5 request and response-handling path in the Continue codebase; the issue does not name a file, test, or reproduction. Compare the failing OpenAI interaction with the working Opus 4.6 case, and consider the issue addressed when the missing reasoning-item error is prevented or reliably handled.