GPT-6.1 Sol doesn’t support reasoning effort none or minimal

Remove the setting or use medium, the default.

Rejected Applies to gpt-6.1-sol on the OpenAI Chat Completions and OpenAI Responses API.

OpenAI's docs describe this error but don't quote the exact message, so we don't either.

How to fix it

Remove the setting or use medium, the default.

Before

{
  "input": "Summarize this ticket.",
  "model": "gpt-5.6-sol",
  "reasoning": {
    "effort": "minimal"
  }
}

After (GPT-6.1 Sol)

{
  "input": "Summarize this ticket.",
  "model": "gpt-6.1-sol",
  "reasoning": {
    "effort": "medium"
  }
}

GPT-6.1 Sol does not support none or minimal and defaults to medium.

How do I fix this when moving to gpt-6.1-sol?

Remove the setting or use medium, the default.

Where is this documented?