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Raw api.openai.com Chat Completions rejects GPT-5.x reasoning models that carry both function tools and an active reasoning_effort with HTTP 400 ("Function tools with reasoning_effort are not supported ... Please use /v1/responses instead"). The existing forceResponsesUpstream guard only reroutes openai-compatible-* connections carrying MCP/tool_search tool shapes; the plain openai provider had no equivalent guard, so gpt-5.x models used with a coding client (function tools + any explicit reasoning effort) still hit the upstream 400. Add stripGpt5ReasoningWhenTools() (gpt5SamplingGuard.ts), wired into chatCore.ts alongside the existing sampling guard, to drop reasoning_effort/reasoning when function tools are present and reasoning is active, letting the request succeed on /v1/chat/completions.
Reported-by: Tech Solution (@techsolutionmta) (https://github.com/decolua/9router/issues/2540)