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OpenAI· Released Sep 29

GPT-6.1 Sol

Successor to GPT-6 Sol, announced at OpenAI DevDay on 2026-09-29 with near-Astra intelligence for a fifth of the price: $2 input and $10 output per million tokens, a 1.05M-token context window and five reasoning levels. Rolled out in ChatGPT Work, Codex and the API.

Higgsfield: Sol vs Astra on a 3D game prototype, 4x faster at one-fifth the costSep 29

Entries

ganson-labs

@ganson-labs · Oct 4

Tournament where teams of agents built from Claude Sonnet 5.5 and GPT-6.1 Sol each write a territory-capture entry, to compare the models head to head.

sonnynabong

@sonnynabong · Sep 30

Chronograph, an experimental scroll-driven 3D Anime.js demo inspired by the Anime.js site, made with Sol 6.1.

okonio

@okonio · Sep 30

Same prompt and reference image given to Sol and Opus 5.5 to build live Three.js 3D characters, with the full prompt and both codebases.

GPT-6.1 Sol: quick answers

What can you build with GPT-6.1 Sol?
People have published 44 public builds made with GPT-6.1 Sol. The most common uses are coding (15), games (9), agents (4), animation videos (4) and research (4).
What are the best GPT-6.1 Sol GitHub repos?
The most-starred open-source GPT-6.1 Sol projects in the index are Snowium: Chromium 124 ported to Mac OS X Snow Leopard, GPT-6.1 Sol in Microsoft Foundry: C# demo with Responses API and gpt-js-animations: motion graphics engine and skill for GPT models.
Are there GPT-6.1 Sol demo videos?
Yes: 10 videos show GPT-6.1 Sol in use, each linked to the original post.
Where do people share GPT-6.1 Sol projects?
Mostly on GitHub, YouTube and X, from 42 creators between Sep 29 and Oct 7.