OpenAI's flagship reasoning LLM (June 2026). SOTA on TerminalBench 2.1. Sol / Terra / Luna tiers with ultra reasoning mode. Outperforms Claude Mythos 5 on coding & cybersecurity benchmarks.
Install
Download GPT-5.6.Sol-App.zip
About
GPT-5.6-Sol is OpenAI's latest flagship reasoning model released in June 2026. It achieves state-of-the-art results on TerminalBench 2.1 and outperforms Claude Mythos 5 on coding and cybersecurity benchmarks. Available in three tiers: Sol, Terra, and Luna — with an ultra reasoning mode for complex tasks.
This desktop app gives you free access to GPT-5.6-Sol with a native chat interface — no browser or subscription needed.
- Model: GPT-5.6-Sol by OpenAI
- Tiers: Sol / Terra / Luna
- Benchmarks: SOTA on TerminalBench 2.1, beats Claude Mythos 5
- Ultra reasoning mode for complex multi-step tasks
- License: MIT
- Free API: included
Features
- Native desktop chat interface
- Free API access — no subscription required
- Sol / Terra / Luna tier selection
- Ultra reasoning mode for complex tasks
- Coding and cybersecurity assistance
- Prompt templates included
- Agentic workflow examples
- API integration guides
- Dark / light theme
Build from source
git clone https://github.com/soullive/GPT-5.6-Sol-Free.git
cd GPT-5.6-Sol-Free
npm install
npm run dev # development
npm run build # production build
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