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b0e481eaa5
Two independent Grok failures seen when the provider is reached through a relay (a custom base URL) instead of api.x.ai directly: - lib/ai/providers.ts: a long non-streaming chat completion was cut off by the relay with a 504 at its idle timeout (~5 min), because nothing is sent upstream until the model has the whole answer. Adding 'grok' to the existing streaming-compat path (OPENAI_COMPAT_USE_STREAMING_CHAT=true) keeps bytes flowing across the idle window; the SSE is buffered back into a normal JSON response for the caller. The path is for relays only. usesCustomOpenAIBaseUrl recognises OpenAI's origin alone, so Grok's own api.x.ai also read as "custom" and was forced onto the compat transport; the provider's native endpoint is now excluded. - lib/media/adapters/grok-image-adapter.ts: response_format 'url' returns a link on the relay's CDN host (imgen.x.ai), which may be unreachable from the server's network. The generation then failed at the follow-up fetch through /api/proxy-media even though the image had been produced successfully. 'b64_json' inlines the bytes and removes that second hop. Inline bytes declare no media type, so the adapter reports one on ImageGenerationResult and returns a typed data URL, which is the shape openrouter-image-adapter already uses. Consumers take the type from there: agent image persistence records it, the client's stored media row keeps the type its data URL states, and classroom-media-generation names the file with the matching extension. A JPEG is no longer stored, served or named as a PNG. The process-wide undici timeout that previously accompanied these changes is dropped: upstream #1404 now gives LLM calls their own undici headers/body timeouts, which covers the same failure without raising the defaults globally. Co-authored-by: ciclou1 <ciclou1@users.noreply.github.com> Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com> Co-authored-by: wyuc <wang-yc24@mails.tsinghua.edu.cn>