Grok 4.1 Fast vs Kimi K2.6
Benchmarks, API pricing and specs, head to head. Data updated 2026-06-10.
xAI · Nov 2025
A 2M-token context window for $0.20 per million input tokens — the cheapest long-context frontier offering anywhere.
Moonshot AI · Apr 2026
Moonshot's multimodal flagship that ties GPT-5.5 on several coding evaluations at a fraction of the price, with open weights.
The verdict
These two models don't yet share verified results on the benchmarks we track, so judge them on specs, pricing and intended use. On price the gap is dramatic: Grok 4.1 Fast works out roughly 6.2x cheaper per blended million tokens. Grok 4.1 Fast also takes 2M of context versus 262K for Kimi K2.6. And Kimi K2.6 is open-weights (Modified MIT), so it can be self-hosted — a structural advantage if data control or vendor independence matters.
Specs & pricing
| Grok 4.1 Fast | Kimi K2.6 | |
|---|---|---|
| modhub Index | — | — |
| Input price / 1M | $0.2 | $0.95 |
| Output price / 1M | $0.5 | $4 |
| Context window | 2M | 262K |
| Max output | — | 262K |
| Open weights | no | yes (Modified MIT) |
| Reasoning model | yes | yes |
| Multimodal input | text, image | text, image |
| Knowledge cutoff | Nov 2025 | Feb 2026 |
| Released | Nov 2025 | Apr 2026 |
| Example monthly cost* | $2.75 | $15.50 |
* 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 4.1 Fast or Kimi K2.6?
- These two models don't yet share verified results on the benchmarks we track, so judge them on specs, pricing and intended use. On price the gap is dramatic: Grok 4.1 Fast works out roughly 6.2x cheaper per blended million tokens. Grok 4.1 Fast also takes 2M of context versus 262K for Kimi K2.6. And Kimi K2.6 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 4.1 Fast or Kimi K2.6?
- Grok 4.1 Fast costs $0.2/$0.5 per million input/output tokens, while Kimi K2.6 costs $0.95/$4. For a typical workload of 10M input and 1.5M output tokens per month, that's $2.75 versus $15.50.
- Which model is better for coding, Grok 4.1 Fast or Kimi K2.6?
- We don't yet track SWE-bench Verified results for both models; check their individual pages for coding-related scores.