"On Agents' Last Exam, GPT‑5.6 Sol sets a new high of 53.6, eclipsing Claude Fable 5 (adaptive) by 13.1 points. At medium reasoning, it beats Fable 5 by 11.4 points at roughly one-quarter the estimated cost. GPT‑5.6 Terra and Luna also outperforms Fable 5 at around one-sixteenth the cost." — OpenAI
SUMMARYOpenAI launched GPT-5.6 across ChatGPT, Codex, and its API, with global rollout beginning immediately and expanding to full availability over 24 hours. The company says GPT-5.6 Sol sets new highs on Agent’s Last Exam and the Artificial Analysis Coding Agent Index while using fewer tokens, less time, and lower cost than Claude Fable 5. An ultra mode for parallel multi-agent work and improved computer-use capabilities for refining code, documents, presentations, and spreadsheets.
GPT-5.6 Sol sets a new standard for intelligence and efficiency, delivering state-of-the-art performance across coding, knowledge work, cybersecurity, and science with fewer tokens and lower cost. — OpenAI
Source: https://x.com/OpenAI/status/2075271422545703003
On the Artificial Analysis Coding Agent Index, GPT‑5.6 Sol sets a new state of the art at 80.0—2.8 points above Claude Fable 5—while using less than half the output tokens, taking less than half the time, and costing about one-third less. GPT-5.6 launches with ultra mode, our highest-performance setting to accelerate your most ambitious work by coordinating multiple agents to work in parallel.
It trades higher token use for stronger and faster results on demanding tasks. GPT‑5.6 delivers a step change in design judgment.
Its stronger computer-use capabilities let it inspect and refine the rendered result—not just generate the underlying code or content—so it can catch visual and functional issues and apply finishing touches before handing the GPT‑5.6 improves artifact quality across presentations, documents, and spreadsheets, and works better with your templates.
These editable artifacts can be exported to the tools professionals already use and refined as part of real enterprise workflows. GPT‑5.6 is available starting today across ChatGPT, Codex, and the OpenAI API. The rollout is starting globally now and will continue gradually toward full availability over the next 24 hours.
In ChatGPT, Plus, Pro, Business, and Enterprise users access GPT-5.6 Sol through — OpenAI