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OpenAI Launches GPT-6 Sol and GPT-6 Luna as Lower-Cost GPT-6 Models

September 22, 2026 at 16:25 EDT

Foundation Models
AI Agents
Software Dev & Coding

OpenAI has released GPT-6 Sol and GPT-6 Luna, extending its GPT-6 lineup beyond Astra with models aimed at professional work, coding agents, computer use and high-volume tasks at lower API prices. The models are available in ChatGPT Work and Codex for Plus, Pro, Business, Enterprise and Edu users, while GPT-6 Luna is also available to Free and Go users in the desktop app; OpenAI says they are not yet available in Chat.

Sep. 22, 2026 · OpenAI

GPT-6 gets cheaper tiers

GPT-6 Sol and GPT-6 Luna bring the new model family to coding, agents and high-volume work with lower API prices than GPT-5.6 promotional pricing.

50%

price reduction versus GPT-5.6 promotional pricing

1.05M

token context window for Sol and Luna

128K

maximum output tokens

API prices move down

Sol old input

Sol new input

$0.20

Luna old input

$0.10

Luna new input

Each new input price is half of the prior promotional price.

Why developers care

Sol targets harder coding and agentic workflows, while Luna gives teams a cheaper model for high-volume focused tasks.

What still needs testing

Teams still need task-specific checks for reliability, presentation quality and tool-use behavior before routing production work.

Where the models fit

Astra: peak capability→Sol: complex work at lower cost→Luna: high-volume efficiency

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