OpenAI: 'Please welcome GPT-6 Sol and GPT-6 Luna'

OpenAI's official X post on Sept 22, 2026 welcoming GPT-6 Sol and GPT-6 Luna "to the GPT-6 universe": faster, more affordable models built on the advances behind GPT-6 Astra, with more efficient caching and inference. A second post (x.com/OpenAI/status/2102460995180663204) says they roll out in ChatGPT Work and Codex for paid tiers and in the API, and Free/Go users can try Luna in the desktop app. API prices were 50% below GPT-5.6. Verified via the X syndication endpoint (OpenAI, 2026-09-22T18:12Z).

Please welcome GPT-6 Sol and GPT-6 Luna to the GPT-6 universe.

GPT-6 Sol and Luna build on the advances behind GPT-6 Astra, bringing much of its strengths into faster and more affordable models to support work at scale.

We’ve also made caching and inference more efficient, and we’re passing the savings directly to you: 50% lower API prices for Sol and Luna compared with GPT‑5.6 promotional pricing.

Media: https://video.twimg.com/amplify_video/2102460948430966784/vid/avc1/1920x1080/2aqucgwb6tQ7xZ6U.mp4?tag=29

views 9990746 · likes 53492 · reposts 5298 · replies 2235 (at fetch time)

Archived 2026-09-29 via fxtwitter (unofficial).