OpenAI

OpenAI's product graphic for the GPT-6.1 Sol announcement.
GPT-6.1 Sol Keeps Sol's Token Price and Aims at Astra's Work
AI
On September 29, 2026, OpenAI introduced GPT-6.1 Sol at Sol's existing token price, aimed at work that used to need Astra.
OpenAI's product graphic for the GPT-6 Sol and Luna announcement.
GPT-6 Sol and Luna Arrive at the Lower API Rates, and They Are Not in Chat
AI
On September 22, 2026, OpenAI launched GPT-6 Sol and Luna at lower API rates. Neither model is in regular ChatGPT Chat yet.
OpenAI's announcement graphic for GPT-6 Astra.
OpenAI Starts Rolling Out GPT-6 Astra
AI
On September 3, 2026, OpenAI introduced GPT-6 Astra and began rolling it out.
Published graphic from OpenAI's July 9, 2026 GPT-5.6 post
OpenAI Launches GPT-5.6 as Sol, Terra, and Luna
AI
On July 9, 2026, OpenAI made the GPT-5.6 family generally available in three sizes: Sol, Terra, and Luna.
Figure OpenAI published with the GPT-5.5 post
GPT-5.5 Is in ChatGPT, Codex, and the API, With a Pro Tier Beside It
AI
OpenAI introduced GPT-5.5 on April 23, 2026, with a Pro tier beside it, in ChatGPT, Codex, and the API. A look at what it means for coding at a maker's bench.