3d (edited) • 🎙️ General
GPT-5.6 Preview: Introducing Sol, Terra & Luna
OpenAI has announced a preview of the GPT-5.6 family, introducing three models designed for different levels of capability, speed, and cost.
The New Models
GPT-5.6 Sol
- Flagship model with the strongest reasoning capabilities
- Introduces a new Ultra Mode that leverages sub-agents for complex tasks
- State-of-the-art performance in coding, biology, and cybersecurity benchmarks
GPT-5.6 Terra
- Balanced model for everyday work
- Delivers performance comparable to GPT-5.5
- Costs 2x less than GPT-5.5
GPT-5.6 Luna
- Fast and affordable model
- Designed for speed and cost efficiency while maintaining strong capabilities
Key Updates
- Improved long-horizon reasoning and agentic workflows
- Stronger performance in coding and cybersecurity tasks
- Enhanced safety systems with extensive automated and human red-teaming
- New pricing and prompt caching improvements for developers
- New naming system: generation number (5.6) + capability tier (Sol, Terra, Luna)
Availability
Current Status: Limited preview for a small group of trusted partners through the API and Codex.
General Release: OpenAI plans to make GPT-5.6 Sol, Terra, and Luna available in ChatGPT, Codex, and the API in the coming weeks.
The GPT-5.6 launch is not just about introducing more powerful models-it is about giving users and developers clearer choices across intelligence, speed, and cost.
Which model would best fit your use case: Sol, Terra, or Luna?
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GPT-5.6 Preview: Introducing Sol, Terra & Luna
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