[AW Top 10] 05 Route Pi models to endpoints that support them #65933

Priority 5/10 | 3 source issues | Impact 4/5 | Confidence 4/5 | Effort 2/5

One assignment, one coherent fix

Pi runs fail with HTTP 400 unsupported_api_for_model because models such as grok-4.6 and gpt-5.4-mini are not accessible through the chat completions endpoint. Three workflow failures share this cause.

Implementation scope

Teach Pi model resolution to select the correct API (responses or chat completions) per model, or validate the model and endpoint pairing at compile time with an actionable error. Add the pairing data next to the existing model alias inventory.

Done when

• A test shows Pi selects a supported API for each model in the alias inventory.
• Compile or preflight fails with a clear message when a model cannot be served by the configured Pi endpoint.

Why now

The error text names the exact cause and affects multiple scheduled workflows. Evidence is direct from the failure bodies, though the set of affected models may be larger.

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