# GPT-6.1 Sol, OpenAI’s flagship

By the SelGPT team. Updated October 1, 2026. Source: https://selgpt.app/models/gpt-6-1-sol

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.

> 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.

[See plans](https://selgpt.app/pricing)

## 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 writing](https://selgpt.app/ai-for-writing): Draft, 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 coding](https://selgpt.app/ai-for-coding): Use SelGPT as your AI coding assistant: write functions, explain errors, review pull requests and look up current docs, with a model built for code.
- [Models](https://selgpt.app/models): Every 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 Luna](https://selgpt.app/models/gpt-6-luna): Use OpenAI’s GPT-6 Luna in SelGPT for everyday questions, writing, files and images, unlimited within fair use on every paid plan.
- [Claude Opus 5.5](https://selgpt.app/models/claude-opus-5-5): Use 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 Flash](https://selgpt.app/models/gemini-3-8-flash): Use 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.