Anthropic · Codex · GPT · ChatGPT · OpenAI · Decrypt
GPT-5.6 Rumors Heat Up as Users Swear ChatGPT Suddenly Got Smarter
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★ Tier-1 Source
Something felt different in ChatGPT this week—and a lot of people noticed at once.
Key facts
- The full game took 60 minutes and 15 seconds to create. ( GPT 5.5 Pro always responded with in a 10min mark)
- In a separate post, he noted response times stretching to 20 or 40 minutes, a pace he said hadn't shown up since before GPT-5.5 shipped
- As I’ve said before, based on great authority, GPT-5.6 will be an incremental/solid improvement over GPT-5.5, not a Fable killer," he wrote, while noting Fable 5 still beat both models
- AI insider Chetas Lua reported a similar slowdown testing a robotic simulation, also pretty sure his results come from OpenAI’s new model: “GPT 5.6 Pro continues to mog [ Anthropic’s Fable 5 ] in 3D
Summary
Users across X report sharper outputs and unusually long response times in ChatGPT and Codex this week. Some users reported significantly improved web design and 3D video game outputs from ChatGPT. A formal release for GPT-5.6 is rumored for next week, but OpenAI has yet to announce plans. Across X, testers spent the past two days swapping screenshots and stopwatch times, all pointing to one theory: OpenAI is quietly A/B testing GPT-5.6 inside ChatGPT, swapped in for some users who select GPT-5.5 Pro.