Teknium 72a6d7dffe fix(model_metadata): skip endpoint probe for known providers (Copilot context bug) (#2507) ...

The context length resolver was querying the /models endpoint for known
providers like GitHub Copilot, which returns a provider-imposed limit
(128k) instead of the model's actual context window (400k for gpt-5.4).
Since this check happened before the models.dev lookup, the wrong value
won every time.

Fix:
- Add api.githubcopilot.com and models.github.ai to _URL_TO_PROVIDER
- Skip the endpoint metadata probe for known providers — their /models
  data is unreliable for context length. models.dev has the correct
  per-provider values.

Reported by danny [DUMB] — gpt-5.4 via Copilot was resolving to 128k
instead of the correct 400k from models.dev.

2026-03-22 08:15:06 -07:00

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