We’re making better intelligence easier to access in ChatGPT for everyone: - GPT-5.6 Sol now powers both Instant and deep reasoning for Plus & Pro users, delivering more factual, focused responses. - Free & Go users get unlimited text chats with GPT-5.6 Luna starting tomorrow.↗

An internal version of our next major model produced 10 new results on long-standing open problems in mathematics and theoretical computer science, using roughly $2,000 worth of tokens at GPT-5.6 Sol API rates.↗

After deployment, we applied GPT-5.6 Sol to advance the frontier of efficiency by making itself more efficient to run. The results: - 20% lower serving costs from production GPU kernel improvements. - 15%+ better token-generation efficiency from improved speculative decoding.↗

results: gpt 5.6 sol and claude fable 5 outright refused to game an AI detection system grok 4.5 instantly took up the challenge and after 14 iterations it wrote an essay that finally passed the AI content detector grok then also made a nice website to display all 14 essays i…↗

i know i've been griping about a couple SOL things but overall the GPT 5.6 models are *incredible* - here's my highlights Sol - doesn't talk like a robot anymore - super well done and impressive. not quite fable-level but soooo much better than 5.5 Terra - truly a sonnet-class…↗

OpenAI just dropped A TON of alpha on GPT 5.6-maxxing. it's a long document, but i pulled out the top tricks you can steal right now: 1. delete instructions from your old prompts. OpenAI's rule is to state each instruction exactly once. they found that removing repeated instruc…↗

With 5.6 Sol, a lot of people are still prompting the model exactly as they did 5.5 It's important to note that 5.6 Sol is a lot more tenacious and thorough than previously models. Check out the guide I wrote here to get better outcomes learn.chatgpt.com/docs/prompting↗

One /goal prompt to GPT 5.6 Sol and I got this. I didn't script, research, record, or edit. I did nothing.↗

5.6 Sol is underhyped for general work Real work is not just a repo of markdown files and a git repo High level, high leverage work, whether you're a developer or not, spans crosses email, slack, multiple, documents, multiple tabs in my browser, and native software. It's no lo…↗

And you can also see our full showcase of how I built the game here: developers.openai.com/showcase/backr… This was not really a long-running project, more of a late-night idea. It truly didn't take that long; it built the vibes I wanted, and then we spent some time polishing it!↗

Workbench template to allow many GPT-5.6-Sols and Fables to coordinate as a team: workbench.md/templates/agen…↗

OpenAI just made GPT-5.6 available to everyone, so I wanted to answer the most burning question: Is GPT-5.6 better than Claude Fable 5? I tested both models across 6 real use cases: → Frontend design (5.6 has closed the gap) → Build a 3D Star Fox-style game → Edit and publish…↗

my favorite thing about GPT 5.6 is that it's a fucking stellar researcher. you can now work at the level of your ideas. here's the entire prompt we used to get 5.6 Sol to post-train 5.6 Luna:↗

You can now vibe code a language model. From a single prompt, GPT‑5.6 built the entire training pipeline and trained a model from scratch on my iMessage history. Locally on my Mac. It now generates replies in my writing style.↗

Introducing ChatGPT Work, a new agent in ChatGPT powered by Codex and GPT-5.6. It can take action across your apps and files, stay with a project for hours if needed, and turn a goal into finished work. It’s a whole new way to get work done.↗

BREAKING: GPT-5.6 Sol is out—AND Codex has been merged into ChatGPT Desktop as ChatGPT Codex. This combo model and desktop app harness are the gold-standard for knowledge work in AI. 5.6 is powerful, fast, half the price of Fable, and my default for almost everything. We’ve b…↗

obviously the best model we have ever produced, but also one of the best blog posts we have ever produced: openai.com/index/gpt-5-6/↗

x.com/i/article/2074…↗

🚨 SCOOP(s): - GPT-5.6 will be the final model in the 5.x series. GPT-6 is slated to launch in about a month, earlier than expected, and possibly even later this month - GPT-6 will be based on a new, significantly larger pretrain (versus the ~4T 5.5/5.6 'Spud' base) - There is l…↗