The entire GPT-5.6 family (Sol, Terra, Luna) only supports
/v1/responses and rejects /v1/chat/completions with this error:
"Function tools with reasoning_effort are not supported
in /v1/chat/completions. Please use /v1/responses instead."
This affects Azure OpenAI deployments of gpt-5.6-sol,
gpt-5.6-terra, and gpt-5.6-luna — all three fail the same way.
GPT-5.6 launched July 9, 2026 and is now generally available.
As the most capable OpenAI model family, it would be great
to support it via the Responses API endpoint.
The fix would likely involve detecting gpt-5.6-* models and
routing to /v1/responses instead of /v1/chat/completions,
or adding a provider profile option to force Responses mode.
Azure endpoint used:
https://[resource].openai.azure.com/openai/v1
The entire GPT-5.6 family (Sol, Terra, Luna) only supports
/v1/responses and rejects /v1/chat/completions with this error:
"Function tools with reasoning_effort are not supported
in /v1/chat/completions. Please use /v1/responses instead."
This affects Azure OpenAI deployments of gpt-5.6-sol,
gpt-5.6-terra, and gpt-5.6-luna — all three fail the same way.
GPT-5.6 launched July 9, 2026 and is now generally available.
As the most capable OpenAI model family, it would be great
to support it via the Responses API endpoint.
The fix would likely involve detecting gpt-5.6-* models and
routing to /v1/responses instead of /v1/chat/completions,
or adding a provider profile option to force Responses mode.
Azure endpoint used:
https://[resource].openai.azure.com/openai/v1