# OpenAI Launches GPT-6 Sol and Luna, Cutting API Prices in Half

*2026-09-22 22:01 UTC · AI · 1 min read*

> OpenAI released GPT-6 Sol and Luna with permanent 50% API price cuts, fewer factual errors, and better agent-safety scores than their predecessors.

OpenAI released two new models, GPT-6 Sol and GPT-6 Luna, on September 22, just 19 days after its flagship GPT-6 Astra. The company is positioning them as workhorses for everyday enterprise tasks that do not need Astra's top-tier reasoning.

GPT-6 Sol now costs $2/$10 per million input/output tokens, down from $4/$20 for GPT-5.6 Sol, matching Claude Sonnet 5 pricing. GPT-6 Luna drops to $0.10/$0.50 per million tokens. An OpenAI spokesperson confirmed the cuts are permanent list prices, not a limited promotion, made possible by inference and caching improvements alongside a 90% discount on cached input reads.

OpenAI says GPT-6 Sol makes roughly half as many factual errors as its predecessor and scores better on agent-safety metrics such as deception and failure disclosure. Sol targets recurring complex work like code review and debugging, while Luna is aimed at high-volume summarization and extraction. Both are live in the API now and rolling out to ChatGPT Work and Codex subscribers, with Luna also reaching free users through the desktop app.

## Sources

- [venturebeat.com](https://venturebeat.com/technology/openai-releases-gpt-6-sol-and-luna-models-slashing-api-costs-50-or-more)
- [thenewstack.io](https://thenewstack.io/openai-gpt-6-sol-luna-release/)

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TechTools News · https://techtools.cz/tools/news/article/2421-openai-launches-gpt-6-sol-and-luna-cutting-api-prices-in-half
Česká verze: https://techtools.cz/tools/news/clanek/2494-openai-spustil-modely-gpt-6-sol-a-luna-ceny-api-snizil-o-polovinu