teknium1
3275ca88ec
The openai-codex image provider rode a Responses call with a hosted image_generation tool on a pinned chat model (gpt-5.5). Two failure classes came with that shape: when OpenAI withdrew gpt-5.5 from an account cohort every image call 404'd while chat kept working (#105398, #107076), and the host model was free to answer in text instead of calling the tool, so we streamed SSE, kept partial frames and retried on empty streams. Post to chatgpt.com/backend-api/codex/images/generations and images/edits instead - the route the official Codex client uses (codex-rs/ext/image-generation). No host model, no SSE, no partial-frame handling; the response is a plain JSON body with b64_json. Remote source URLs are fetched client-side and inlined as data URLs because the backend's own downloader 400s on ordinary public images. The backend treats model/quality/size as advisory (#107233), so the result now reports reported_quality/reported_size next to the requested values plus the x-codex-imagegen-request-id for support. GPT Image 2.5 is deliberately not added to this catalog: the backend accepts any model id, including nonexistent ones, and generates with its server-managed engine (C2PA reports gpt-image 2.0), so a 2.5 tier here would be a label with no effect (#106708).
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