# OpenAI launches GPT-5.6 in three tiers: Sol, Terra, Luna

> OpenAI has split its newest flagship into three named tiers rather than shipping a single monolithic model. Sol is the top-end reasoning system aimed at coding and science, complete with a new Ultra subagent mode and a Max reasoning-effort setting; Terra sits in the middle as a balanced workhorse; and Luna is the cheap, fast option at roughly a dollar per million input tokens, which OpenAI pitches as a quarter of what leading rivals charge. The more telling launch may be what shipped alongside it. ChatGPT Work is framed not as a chatbot that answers questions but as an agent built to carry out entire jobs, running on Sol with its heaviest reasoning settings. That reframing, from answering to doing, is where the industry is clearly headed. Pricing this aggressively while pushing an autonomous work agent signals OpenAI is competing on both cost and capability at once. Sol is even offered on Cerebras hardware at 750 tokens per second for enterprises that need speed. For most readers the practical takeaway is simpler: better models, cheaper tiers, and software that increasingly tries to finish tasks on its own.

_Section: [Daily AI Updates](https://www.wortins.com/daily-ai) · Source: OpenAI · Published Thursday, July 23, 2026_

## Wortins' read

OpenAI has split its newest flagship into three named tiers rather than shipping a single monolithic model. Sol is the top-end reasoning system aimed at coding and science, complete with a new Ultra subagent mode and a Max reasoning-effort setting; Terra sits in the middle as a balanced workhorse; and Luna is the cheap, fast option at roughly a dollar per million input tokens, which OpenAI pitches as a quarter of what leading rivals charge. The more telling launch may be what shipped alongside it. ChatGPT Work is framed not as a chatbot that answers questions but as an agent built to carry out entire jobs, running on Sol with its heaviest reasoning settings. That reframing, from answering to doing, is where the industry is clearly headed. Pricing this aggressively while pushing an autonomous work agent signals OpenAI is competing on both cost and capability at once. Sol is even offered on Cerebras hardware at 750 tokens per second for enterprises that need speed. For most readers the practical takeaway is simpler: better models, cheaper tiers, and software that increasingly tries to finish tasks on its own.

## Source

[Read the full story at OpenAI](https://openai.com/index/gpt-5-6/)

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