OpenAI Launches GPT-5.6 Sol, Terra, and Luna for General Availability

OpenAI has begun rolling out the GPT-5.6 model family for general availability, bringing its new flagship Sol model alongside the mid-tier Terra and budget-friendly Luna to ChatGPT, ChatGPT Work, Codex, and the API.



The rollout follows a limited preview period initiated late last month. OpenAI says GPT-5.6 Sol achieves state-of-the-art results across coding, knowledge work, cybersecurity, and science while using fewer tokens than previous frontier models, delivering stronger performance per dollar. On the Agents' Last Exam benchmark, which evaluates long-running professional workflows, Sol scored 53.6 percent, beating Anthropic's Claude Fable 5 by 13.1 percentage points. OpenAI says Terra outperforms Fable 5 at substantially lower cost, while Luna surpasses Claude Opus 4.8 in coding tasks at approximately one-quarter the estimated cost.


For developers, GPT-5.6 introduces an ultra capability setting that coordinates four agents in parallel to complete complex tasks faster. The models also feature Programmatic Tool Calling in the Responses API, allowing the AI to write and run lightweight programs in memory to coordinate tools and filter intermediate data rather than sending every tool response back to the developer. Developers can also build ultra-style workflows using the new multi-agent beta in the Responses API.

The release introduces OpenAI's strongest cybersecurity capabilities yet, achieving a 73.5 percent score on ExploitBench2. Because of the models' advanced cybersecurity capabilities, OpenAI is reserving access to its most cyber-capable frontier models through its Trusted Access for Cyber program. Individual members must enable Advanced Account Security with hardware-backed passkeys by September 1 to retain access to these models.

Beyond coding, GPT-5.6 improves knowledge work by generating more polished presentations, documents, and spreadsheets. It can infer a presentation's design system—including layouts, typography, spacing, colors, and Slide Master rules—from reference decks and apply those conventions consistently to new material. Its enhanced computer use capabilities also let the model inspect its rendered output to catch visual and functional issues before delivering the final result.

The GPT-5.6 family is rolling out globally over the next 24 hours. In the API, Sol is priced at $5 per million input tokens and $30 per million output tokens. Terra costs $2.50 for input and $15 for output, while Luna is priced at $1 and $6 respectively. Availability varies by subscription tier across ChatGPT, ChatGPT Work, Codex, and the OpenAI API.