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OpenAI GPT-5.6 Model Series Released

OpenAI has unveiled its GPT-5.6 suite of flagship Sol, Balanced Terra, and Efficient Luna for ChatGPT, Codex, and API.

07/10/2026Updated 07/10/20261 sources reviewed
Quick summary
  • GPT-5.6 Sol·Terra·Luna is available in three grades.
  • ChatGPT and Codex, API are available in sequence.
  • Ultra and API multi-agent capabilities are introduced to perform complex tasks as parallel agents.
WHAT HAPPENED

What happened?

OpenAI has unveiled its GPT-5.6 suite of flagship Sol, Balanced Terra, and Efficient Luna for ChatGPT, Codex, and API.

This announcement shows that we have moved from a single top performance competition to a product structure that chooses models according to the difficulty of work and cost. Developers need to re-compare token costs, delay times, and how tools are called, along with actual quality.

WHY IT MATTERS

Why does it matter?

Not only model performance, but cost-efficiency and how multiple agents run can change the selection criteria for AI work tools.

WHO SHOULD CARE

Who should care?

The ordinary user.The Developercompany
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Performance figures are based on OpenAI’s own and external benchmark descriptions, and actual work outcomes may vary depending on the task.