#Azure Foundry gpt-5.6-sol fails in Codex after update

3 messages · Page 1 of 1 (latest)

vocal ivyBOT
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Reported by @signal ice

Bug Report: Azure Foundry gpt-5.6-sol fails in Codex after update
`Steps to Reproduce`
  1. Use Codex Desktop on Windows with Azure AI Foundry as a custom provider.
  2. Configure model/deployment as gpt-5.6-sol using Responses API.
  3. Send any prompt in Codex.
  4. Observe that the model appears available but does not answer.
`Expected Result`

Codex should send a compatible Azure Responses API request and gpt-5.6-sol should answer normally, like it did when treated as a custom model.

`Actual Result`

Every turn fails with:

X-OpenAI-Internal-Codex-Responses-Lite only supports function tools, custom tools, and client-executed tool search.

Direct Azure Responses API calls to the same deployment work, so the issue seems specific to Codex’s request shape.

`Environment`

Windows, Codex Desktop/CLI 0.144.0-alpha.4, Azure AI Foundry/Azure OpenAI Responses API, deployment gpt-5.6-sol, use_responses_lite=True, multi_agent_version=v2, direct Azure Responses API call works.

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Additional Information

Please provide relevant details to help resolve the issue, such as:

  • ChatGPT Shared Link (if applicable).
  • Screenshots or videos demonstrating the problem.

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signal ice
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This started after updating Codex today. Yesterday the same Azure Foundry gpt-5.6-sol deployment worked when treated as a custom model. Direct Azure Responses API calls to the same deployment still work, so this seems specific to Codex applying Responses-Lite / multi-agent v2 metadata to Azure.