o1
by OpenAI
Foundational reasoning model trained with reinforcement learning to think step-by-step before responding. Forms rich internal chains of reasoning to tackle complex problems in mathematics, coding, and scientific domains with thoughtful deliberation.
- Deep reasoning foundation using reinforcement learning for step-by-step problem analysis
- Rich internal reasoning chains forming thoughtful deliberation before delivering answers
- Complex problem specialization excelling in mathematics, coding, and scientific challenges
- Multimodal reasoning support handling both text and visual inputs with analytical depth
- Established reasoning benchmark serving as the foundation for OpenAI's reasoning model development
Model Information
Supported Formats
GPT 5.6 SolGPT-5.6 Sol is OpenAI's flagship model in the GPT-5.6 family, released July 9, 2026, for the most complex professional work spanning software engineering, long-horizon research, agentic tool use, and careful result refinement.
GPT 5.6 TerraGPT-5.6 Terra balances capability and cost efficiency for everyday production workloads in the GPT-5.6 family, released July 9, 2026.
GPT 5.6 LunaGPT-5.6 Luna is the fastest, most cost-optimized model in the GPT-5.6 family, released July 9, 2026, built for high-volume and latency-sensitive workloads.