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OpenAI Rolls Out GPT-6 Sol and Luna for ChatGPT Work, Codex and API Users

September 23, 2026 at 03:23 EDT

Foundation Models
AI Agents
Software Dev & Coding

OpenAI has rolled out GPT-6 Sol and GPT-6 Luna, lower-cost members of the GPT-6 family, to ChatGPT Work, Codex and the API. The Sept. 22 release positions the two models as faster, cheaper companions to GPT-6 Astra for agentic work, coding and high-volume production tasks.

Sept. 22, 2026 | OpenAI

GPT-6 moves downmarket

Sol and Luna bring GPT-6 capabilities to Work, Codex and API users at lower per-token prices, aiming to make agentic work cheaper to repeat.

50%

API price cut versus GPT-5.6 promotional pricing

1.05M

context window for both Sol and Luna

128K

maximum output tokens on each model

$0.10

Luna input price per 1M tokens

Sol output price per 1M tokens

Each stacked block represents $2 in output-token cost.

$20

GPT-5.6 Sol

$10

GPT-6 Sol

The listed Sol output rate falls by half, from $20 to $10 per 1M tokens.

How the family is meant to tier work

Luna

Focused, repeatable extraction, routing, summaries and short answers.

→

Sol

Complex coding, agentic workflows and recurring professional work.

→

Astra

Highest-depth reasoning when the hardest tasks justify the cost.

Why developers care

Cheaper iteration for Codex and agent loops.
Luna can handle high-volume helper tasks.

What to watch

Task-level costs depend on tokens, retries and reasoning effort.
Early coding-quality reports vary by workload.

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