# Kimi K3, for deep reasoning

By the SelGPT team. Updated October 1, 2026. Source: https://selgpt.app/models/kimi-k3

Kimi K3 from Moonshot AI thinks through hard problems step by step before it answers. In SelGPT it sits next to GPT-6.1, Claude and Gemini.

> Kimi K3 is a reasoning model from Moonshot AI that works through hard, multi-step problems before answering. SelGPT includes it in Plus from $9.99 a month billed yearly, served only by hosts that agree not to train on your chats.

## What it is good at

- Maths, logic and planning problems with many steps.
- Comparing options and recommending one, with the reasons.
- Agent-style tasks that use tools such as web search.

## 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

### Who makes Kimi K3?

Moonshot AI. In SelGPT it runs on hosts that agree not to train on your requests.

## Related

- [AI for research](https://selgpt.app/ai-for-research): Research with SelGPT: it searches the web, pulls several sources together, compares them and shows where every fact came from.
- [AI for math](https://selgpt.app/ai-for-math): Solve and understand maths problems step by step with SelGPT’s reasoning model, from algebra and statistics to proofs and word problems.
- [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.
- [GPT-6.1 Sol](https://selgpt.app/models/gpt-6-1-sol): Use OpenAI’s GPT-6.1 Sol in SelGPT for writing, analysis and code, alongside Claude, Gemini and Kimi, from $9.99 a month billed yearly.