Grok 4 vs Kimi K2 Thinking
Benchmarks, API pricing and specs, head to head. Data updated 2026-06-10.
xAI · Jul 2025
xAI's mid-2025 flagship, trained on the 200K-GPU Colossus cluster — a math and science reasoning standout of its generation.
Moonshot AI · Nov 2025
A trillion-parameter open reasoning agent that can chain 200–300 tool calls — the open-weights agentic standout of late 2025.
The verdict
Grok 4 wins 2 of the 3 benchmarks these models share, against 1 for Kimi K2 Thinking. On price the gap is dramatic: Kimi K2 Thinking works out roughly 5.6x cheaper per blended million tokens. Kimi K2 Thinking also takes 262K of context versus 256K for Grok 4. And Kimi K2 Thinking is open-weights (Modified MIT), so it can be self-hosted — a structural advantage if data control or vendor independence matters.
Benchmark head-to-head 2–1
Specs & pricing
| Grok 4 | Kimi K2 Thinking | |
|---|---|---|
| modhub Index | — | 67.6 |
| Input price / 1M | $3 | $0.6 |
| Output price / 1M | $15 | $2.5 |
| Context window | 256K | 262K |
| Max output | — | — |
| Open weights | no | yes (Modified MIT) |
| Reasoning model | yes | yes |
| Multimodal input | text, image | text |
| Knowledge cutoff | Jul 2025 | Apr 2025 |
| Released | Jul 2025 | Nov 2025 |
| Example monthly cost* | $52.50 | $9.75 |
* 10M input + 1.5M output tokens per month at list prices, no caching. Green = better value on that row.
Frequently asked questions
- Which is better, Grok 4 or Kimi K2 Thinking?
- Grok 4 wins 2 of the 3 benchmarks these models share, against 1 for Kimi K2 Thinking. On price the gap is dramatic: Kimi K2 Thinking works out roughly 5.6x cheaper per blended million tokens. Kimi K2 Thinking also takes 262K of context versus 256K for Grok 4. And Kimi K2 Thinking is open-weights (Modified MIT), so it can be self-hosted — a structural advantage if data control or vendor independence matters.
- Which is cheaper, Grok 4 or Kimi K2 Thinking?
- Grok 4 costs $3/$15 per million input/output tokens, while Kimi K2 Thinking costs $0.6/$2.5. For a typical workload of 10M input and 1.5M output tokens per month, that's $52.50 versus $9.75.
- Which model is better for coding, Grok 4 or Kimi K2 Thinking?
- We don't yet track SWE-bench Verified results for both models; check their individual pages for coding-related scores.