Grok vs Kimi at a glance
| Grok | Kimi | |
|---|---|---|
| Developer | xAI | Moonshot AI |
| Latest version | Grok 4.5 | Kimi K3 |
| Known for | Real-time | Long-context |
| Context window | Up to 2 million tokens (flagship tier) | Up to 1 million tokens |
| Multimodal support | Text, images, and video | Text, images, and video |
| Open source | No | Partially |
| Official pricing | Free tier on X and grok.com; SuperGrok is $30/mo | Free to chat here; API from $0.30 per million cached tokens |
Grok benchmark highlight
Posts 83.3% on Terminal-Bench 2.1 and leads outright on SWE Marathon
Kimi benchmark highlight
Ranked #1 on LMArena's Frontend Code Arena, ahead of GPT and Claude on that leaderboard
Which one should you use?
Choose Grok if you want:
- Current events & trending topics
- Fast-moving research
- Math & reasoning problems
- A more direct, less filtered tone
Choose Kimi if you want:
- Large document analysis
- Long-context research
- Cost-efficient agentic tasks
- Processing books & lengthy reports
Standout strengths
Grok
Real-time information
Reads live public posts and events, so it's strong on breaking news and fast-moving topics.
DeepSearch citations
Pulls and cites sources directly instead of answering purely from training memory.
Strong reasoning & math
Competitive on academic and PhD-level science benchmarks, with sharply reduced hallucination rates.
Kimi
1M-token context window
Reads entire books, research papers, or codebases in a single pass without losing track.
Fast decoding at scale
A hybrid attention mechanism keeps long-context responses fast instead of slowing to a crawl.
Native vision understanding
Combines strong vision and language understanding in one model, not a separate add-on.
Frequently asked questions
Try Grok and Kimi for free
No credit card, no account required — pick Grok for current events & trending topics, or Kimi for large document analysis.