OpenAI launches GPT-6 Sol and GPT-6 Luna: new generation, halved prices
In one sentence On September 22 OpenAI moved its mid and low-tier models to the GPT-6 generation: GPT-6 Sol at $2/$10 and GPT-6 Luna at $0.10/$0.50 per million tokens, 50% below GPT-5.6 promotional pricing. 1.05M-token context.
After the flagship GPT-6 Astra, released in early September, OpenAI also updated the two models most developers use every day. GPT-6 Sol is the mid-tier workhorse, GPT-6 Luna the small, cheap one.
The headline is price: according to OpenAI they cost half the promotional prices of their GPT-5.6 predecessors. Luna, at 10 cents per million input tokens, matches GPT-5.6 Sol at higher effort levels according to the company, while Sol makes half as many mistakes as the model it replaces.
Both are available immediately in ChatGPT Work and Codex for Plus, Pro, Business, Enterprise and Edu plans; Free and Go users get Luna in the desktop app. A week later, at DevDay on September 29, OpenAI introduced GPT-6.1 Sol, an upgrade of Sol at the same price.
Companies
OpenAI
Tools
GPT-6 Sol, GPT-6 Luna, ChatGPT, Codex
Tags
Sources
- https://www.constellationr.com/insights/news/openai-adds-gpt-6-luna-and-sol-touts-lower-prices
- https://computingforgeeks.com/gpt-6-sol-luna-released-features-benchmarks/
- https://www.cloudzero.com/blog/gpt-6-pricing/
- https://techcrunch.com/2026/09/29/openai-launches-gpt-6-1-sol-says-it-nearly-matches-gpt-6-astra-and-costs-less/