reasoning effort none returns a 400 on GPT-6 Astra

Q: How do I fix this when moving to gpt-6-astra?

Use low, the lowest effort GPT-6 Astra supports.

Returns 400 Applies to gpt-6-astra 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

Use low, the lowest effort GPT-6 Astra supports.

Before

{
  "messages": [
    {
      "content": "Summarize this ticket.",
      "role": "user"
    }
  ],
  "model": "gpt-5.6-sol",
  "reasoning_effort": "none"
}

After (GPT-6 Astra)

{
  "messages": [
    {
      "content": "Summarize this ticket.",
      "role": "user"
    }
  ],
  "model": "gpt-6-astra",
  "reasoning_effort": "low"
}

Check your whole request in the linter