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Grok (xAI) vs Kimi
A plain-English comparison to help you choose between them.
Two challengers to the default assistants, separated by what they know: Grok reads X and the live web as it answers, Kimi turns research into artefacts you can show. Pick Grok for fast-moving topics, breaking stories and anything a fixed-cutoff model would hedge on, weighing the brand-safety caveat before it becomes a company default. Pick Kimi when the output should be a briefing, a deck or a quick website rather than a feed-fresh answer, on a free tier generous enough to learn every surface before paying.
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Side by side
- Summary
Grok is xAI's assistant, distinguished by real-time grounding in X and the live web: it answers about what is happening now, not what the training data remembers. The model line has pushed to the benchmark front on reasoning, with long context, deep research modes and document generation arriving through successive releases.
The tier range is unusually wide, from a rate-limited free tier through mid-price plans to heavy top tiers, with voice features and agent tooling growing quickly around the core.
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The brand-safety question is the standing caveat: its permissiveness record makes it a personal-productivity choice more comfortably than a corporate-default one.
- Best for
- Real-time answers grounded in X and the live web
- Benchmark-front reasoning on the top models
- Tracking breaking topics as they develop
- A wide tier range from free to heavy use
- Users already living inside the X ecosystem
- Cost
- Freemium (Free tier + paid plans)
- Ease
- Openness
- Hosted service
- Data
- Its distinguishing feature is live grounding in X and the open web, so prompts travel to xAI and answers are shaped by public posts; treat anything confidential as unsuitable, and expect the provenance of a real-time answer to be a moving target rather than a citable source.
- Summary
Kimi is Moonshot AI's everyday assistant, and its distinguishing surfaces are the ones that produce finished artefacts: a deep research mode plus slide and website generation, all from the same conversation. It is beginner-friendly and freemium, with paid membership from $19 a month on the Moderato tier.
The membership carries a quiet second benefit. A paid tier also includes Kimi Code, Moonshot's coding agent, which shares the membership's single credit pool, with larger allowances on the higher tiers; the free tier carries no Kimi Code credits.
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For individuals and small teams who want research to end in something showable rather than a wall of chat, it is a strong-value pick.
- Best for
- Deep research briefings on unfamiliar topics
- Prompt-to-deck slides for working presentations
- Quick landing pages and microsites without code
- A free tier for everyday assistance
- One bill spanning assistant and coding agent
- Cost
- Freemium (Free tier + paid plans)
- Ease
- Openness
- Runs privately (self-hostable)
- Data
- Kimi is a hosted assistant whose consumer terms store data in China under PRC law, so weigh where your prompts and documents travel before routing sensitive work through it; for confidential material, prefer surfaces whose data terms you have checked.
Pricing
- Grok (xAI)
Free·$30$30/user·Custom
Prices as of August 2026.
- Free
- Free
- SuperGrok
- $30per month
- Business
- $30per user, per month
- Enterprise
- Price on applicationno list price published
- Kimi
Free·$19·$39·$99·$199
Prices as of August 2026.
- Adagio
- Free
- Moderato
- $19per month$15 per month if billed annually; new plans are waitlist-only
- Allegretto
- $39per month$31 per month if billed annually; new plans are waitlist-only
- Allegro
- $99per month$79 per month if billed annually; new plans are waitlist-only
- Vivace
- $199per month$159 per month if billed annually; new plans are waitlist-only
By area
Where each one pulls ahead, area by area.
| Area | Grok (xAI) | Kimi |
|---|---|---|
| By job | ||
| Getting started | Grok has a beginner follow its citations, which teaches the checking habit early and is the habit worth forming first | Kimi — when the free tier should let a newcomer learn every surface before anything is spent |
| By task | ||
| Search & knowledge retrieval | Grok tracks a developing story as the sources appear and will gauge the sentiment around a topic on X, which is a reading of the present rather than a report on it | Kimi answers the open question through a deep research run, so the reply rests on a dig rather than on what is being said at that moment |
| Writing & research | Grok cross-checks the dated claims in an older draft and summarises the live discussion around an event, which is the work that goes stale fastest | Kimi has a deep research surface doing the digging before there is a draft to check, which suits a piece built on an unknown rather than on this week |
Common questions
What is the brand-safety caveat on Grok?
A permissiveness record, including a documented image-generation safety scandal, that makes it easier to defend as a personal-productivity pick than as a corporate default where brand safety and regulated data are in play. Its looser, opinionated tone is deliberate, and some organisations treat that as governance risk; the more governed assistants are the safer workplace start.
What do the free tiers actually cover?
Grok is free on X and in its own apps within rate limits, with an unusually wide tier range above that, from mid-price plans to heavy top tiers. Kimi's free tier covers everyday assistance plus the headline surfaces, deep research, generated slides and websites, but carries no Kimi Code credits, so coding on the same bill starts at a paid membership tier.
How well grounded are their answers?
Differently. Grok cites live sources and reads public posts as events unfold, but X-sourced answers inherit X's biases and noise, so the citations deserve following. Kimi's deep research is built for open questions worked across the web into a structured briefing. Neither grounds answers strictly in documents you supply; that fenced behaviour belongs to the source-grounded notebooks.
Related comparisons
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Tool facts last checked July 2026