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An ordinary agent with a tool fails on the whole GPT-5.6 family:
Agent(role=..., goal=..., backstory=...,
llm=LLM(model="openai/gpt-5.6-sol"), tools=[multiply])
Function tools with reasoning_effort are not supported for gpt-5.6-sol in
/v1/chat/completions. To use function tools, use /v1/responses or set
reasoning_effort to 'none'.
Nothing sets reasoning_effort -- not the user, not CrewAI. The family applies a
server-side default and then refuses it once tools are present. Confirmed with
raw HTTP, no CrewAI involved, on a payload with no reasoning_effort key at all:
gpt-5.6-sol tools, no reasoning_effort key -> 400
gpt-5.6-sol tools, reasoning_effort="none" -> OK
gpt-5.5 tools, no reasoning_effort key -> OK
gpt-5.4 tools, no reasoning_effort key -> OK
gpt-5.2 tools, no reasoning_effort key -> OK
So this is GPT-5.6 only, and it needs an explicit "none" -- dropping the key is
what the rejected request already looked like.
Recovered from the error rather than a model list: catch the 400, resend with
reasoning_effort="none", once. No model names, so a family OpenAI restricts later
works without a release here. Detection matches the structured `param` field plus
the message, so the unrelated "Unsupported value" 400 that o1/o3 return for
"none" isn't mistaken for this one, and the retry can't loop.
Verified against main with real agents (no reasoning_effort anywhere):
model no tools tools tools + reasoning=True
gpt-5.6-sol ok / ok 400 / ok hang / ok
gpt-5.6-terra ok / ok 400 / ok - / ok
gpt-5.6-luna ok / ok 400 / ok - / ok
gpt-5.5 ok ok -
gpt-5.2 ok ok ok / ok
gpt-4o ok ok -
On main, tools + Agent(reasoning=True) produced no output and no error and was
killed at 420s; gpt-5.2 with the same config finishes in ~40s. Both the 400 and
that hang are fixed.
Tests: 15 cases, including agent definitions with tools, with tools plus
reasoning=True, and without tools. tests/llms + tests/agents -> 961 passed
(1 pre-existing unrelated failure from a local OLLAMA_API_KEY env leak).
Ruff + mypy clean.