GPT-6.1 Sol, OpenAI’s flagship
GPT-6.1 Sol is OpenAI’s flagship model for demanding writing, analysis and code. In SelGPT it sits next to Claude, Gemini and Kimi in the same chat.
By the SelGPT team. Updated
GPT-6.1 Sol is OpenAI’s flagship model, strong at writing, analysis and code. SelGPT includes it in Plus from $9.99 a month billed yearly, with Claude Opus 5.5, Gemini 3.8 Flash, Kimi K3 and more in the same app, and you can switch between them in any conversation.
What it is good at
- Long-form writing and editing.
- Analysis of data, documents and decisions.
- Writing and reviewing code.
Plans
It draws from your plan’s monthly allowance, shown as a percentage in the app. GPT-6 Luna stays unlimited on paid plans when the allowance runs out.
Questions
Can I use GPT-6.1 Sol without ChatGPT?
Yes. SelGPT includes GPT-6.1 Sol in its own app, alongside models from other labs, from $9.99 a month billed yearly.
Related
- AI for writingDraft, rewrite and polish emails, essays, posts and reports with SelGPT, an AI writing assistant with GPT-6.1, Claude, Gemini and more, web search and no ads.
- AI for codingUse SelGPT as your AI coding assistant: write functions, explain errors, review pull requests and look up current docs, with a model built for code.
- ModelsEvery model in SelGPT: GPT-6 Luna, Claude Opus 5.5, GPT-6.1 Sol, Gemini 3.8 Flash, Kimi K3, DeepSeek, MiMo, GLM and Qwen, in one chat.
- GPT-6 LunaUse OpenAI’s GPT-6 Luna in SelGPT for everyday questions, writing, files and images, unlimited within fair use on every paid plan.
- Claude Opus 5.5Use Anthropic’s Claude Opus 5.5, ranked #1 on the Artificial Analysis Intelligence Index, in SelGPT Plus from $9.99 a month billed yearly.
- Gemini 3.8 FlashUse Google’s Gemini 3.8 Flash in SelGPT for research and long documents, alongside GPT-6.1, Claude and Kimi, from $9.99 a month billed yearly.