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5d3f85fc71
resolveModelByProviderInference() in open-sse/services/model.ts had an unconditional /^gpt-/i heuristic that hijacked any model id starting with gpt-/o1/o3 into provider openai, even when the id is cataloged under other providers. This broke bare (non-combo) requests for open-weight models like gpt-oss-120b (served by fireworks/cerebras/scaleway/byteplus/sambanova/ heroku), which don't exist on openai's catalog, producing a 404 with no fallback. Gate the heuristic on providers.length === 0 so it only fires for genuinely uncataloged openai-family ids, letting cataloged ids fall through to the existing single-candidate / ambiguous-candidate resolution paths. Regression guard: tests/unit/gptoss-provider-inference-5852.test.ts