# OpenAI launches GPT-6 Sol and Luna models

> OpenAI expands its GPT-6 lineup with cheaper, more accurate versions of Sol and Luna, undercutting Anthropic's latest release.
- Title: OpenAI launches GPT-6 Sol and Luna models · TechCrunch
- Summary: OpenAI expands its GPT-6 lineup with cheaper, more accurate versions of Sol and Luna, undercutting Anthropic's latest release. OpenAI's new Sol and Luna…
- Keywords: openai, gpt-6, sol model, luna model, anthropic, ai models, chatgpt, api pricing, factual accuracy, coding performance, technology, startups
- Source: TechCrunch — https://techcrunch.com/2026/09/22/openai-launches-gpt-6-sol-and-luna
- Author: Lucas Ropek
- Published: 2026-09-22T18:00:00+00:00
- Read time: 1 min
- Topics: openai, gpt-6, sol model, luna model, anthropic, ai models, chatgpt, api pricing, factual accuracy, coding performance, technology, startups
## OpenAI expands GPT-6 lineup
OpenAI launched GPT-6 Sol and Luna, smaller models that extend the capabilities of its flagship Astra model released earlier this month.
## Sol handles complex work
Sol is designed for demanding tasks like coding and computer work, while Luna handles high-volume clerical jobs such as summarizing documents and extracting information.
## Prices cut in half
The new Sol and Luna models cost 50 percent less than their GPT-5.6 predecessors, with OpenAI crediting improvements in caching and inference technology.
## Fewer mistakes, better accuracy
GPT-6 Sol makes about half as many factual errors as its predecessor and reaches Astra-level reliability at lower cost. The models also show improved accuracy in coding tasks.

> GPT-6 Sol makes about half as many mistakes as its predecessor, reaching Astra-level reliability at much lower cost.
## Outpacing Anthropic's models
OpenAI claims Sol and Luna substantially outperform Anthropic's top models, Fable and Opus. Anthropic released Opus 5.5 just 90 minutes before OpenAI's announcement.
## Rolling out to users today
Sol and Luna are now available in ChatGPT Work, Codex, and the API for paid accounts. Luna is also available for free users and in the desktop app.
## Key takeaway

OpenAI's new Sol and Luna models cost half as much as their predecessors while making fewer mistakes, intensifying competition with Anthropic.