GPT-5.6 Released, Codex Merged
GPT 5.6 launches with Sol, Terra, and Luna. Codex merges into ChatGPT. Better value, faster performance, and new agent features.
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Even though we’ve heard the story of Altman slumping in his chair many times, every time ChatGPT releases a new model, we still subconsciously hold onto a sliver of anticipation.
We didn’t have to wait long. Just now, the GPT-5.6 series has officially arrived, launching three models at once: the flagship Sol, the balanced Terra, and the value-oriented Luna. The names come from the Latin words for Sun, Earth/Land, and Moon, respectively.
Unlike the twists and turns of Fable 5, starting today, all three models are fully rolling out and will gradually cover ChatGPT, Codex, and the API within 24 hours.
But this isn’t the biggest update. The standalone Codex app has also been discontinued today — yet it hasn’t disappeared. The entire Codex capability has been merged into ChatGPT, creating a brand-new AI super app. GPT-5.6 is the core engine powering this new entry point.
GPT-5.6 Launch: Claude Becomes the Hidden Protagonist
If you open the official GPT-5.6 blog post, you’ll notice one thing: Claude is mentioned so many times it almost feels like an ad for the competitor. By comparison, it makes clear who comes up short.
