OpenAI Introduces GPT-5.6 Family and ChatGPT Work

OpenAI has released new GPT-5.6 models across Sol, Terra, and Luna tiers featuring deep reasoning modes, and launched ChatGPT Work for autonomous operations.

Compiled by Sergey KostenchukPublished 2026-07-09Updated 2026-07-10

2026-07-09 Research OpenAI

🤖 New GPT-5.6 Models and ChatGPT Work from OpenAI

OpenAI has introduced the GPT-5.6 family consisting of three tiers: the flagship Sol (science and coding), the balanced Terra, and the fast Luna. New reasoning modes have been added: 'max' for deep reasoning and 'ultra' for agent operations. Additionally, ChatGPT Work has been released for long-term autonomous tasks.

🌍 The transition to a three-tier architecture (Sol/Terra/Luna) allows for flexible management of computational cost and quality. The 'ultra' mode sets a new standard in agentic workflows.

👤 Users can now choose a model based on the task: Luna for simple tasks, Terra for everyday use, and Sol for complex research. ChatGPT Work will allow users to delegate long-running tasks to the AI.

Source 1: https://www.elser.ai/blog/gpt-5-6-sol-vs-terra-vs-luna-which-model-should-you-use Source 2: https://theairankings.com/openai/gpt-5-6/

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