OpenAI has launched its new GPT-5.6 family of models, including Sol, Terra, and Luna, which are now available across ChatGPT, Codex, and the OpenAI API. GPT-5.6 Sol demonstrates significant advancements, setting new state-of-the-art benchmarks on the Artificial Analysis Coding Agent Index and Agents' Last Exam, outperforming competitors like Claude Fable 5. The new models offer improved artifact quality, enhanced design judgment, and a high-performance "ultra mode" that utilizes multiple agents in parallel for demanding tasks, all while using fewer tokens and at a lower cost. AI
IMPACT Sets new SOTA on coding and agent benchmarks, potentially pressuring competitors and accelerating enterprise adoption of advanced AI capabilities.
RANK_REASON Frontier-lab model release with system card
- ChatGPT
- Claude Fable 5
- Claude Fable 5 (adaptive)
- Codex
- GPT-5.6
- GPT-5.6 Luna
- GPT-5.6 Pro
- GPT-5.6 Sol
- GPT-5.6 Terra
- OpenAI
- OpenAI API
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