GPT-5.6 Pro appears to downgrade to GPT-5.5 Mini across web, desktop and iOS
yuchaocheung-pixel · ghdev · 2026-07-22
GPT-5.6 Pro appears to reroute to GPT-5.5 Mini across web, desktop, and iOS
A GitHub issue against openai/codex reports a possible silent routing mismatch: after selecting GPT-5.6 Pro, the account consistently gets Instant-like responses with no visible reasoning, and the model reportedly identifies itself as GPT-5.5 Mini.
- Reproduced on ChatGPT Web for Windows, Codex Desktop, and ChatGPT for iOS
- The reporter says the behavior is consistent even in a private/incognito browser session
- The issue asks OpenAI to inspect requested-model vs served-model routing, account eligibility, and any safety flags
- If the downgrade is intentional, the user wants the UI to disclose the actual served model
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