Model comparison
Grok 4.1 Fast vs Kimi K2.7 Code
Kimi K2.7 Code is the stronger model overall, scoring 43.3 to 41.4 on the Noometry Index. Grok 4.1 Fast costs 6.2× less per token, which makes it the better buy when Kimi K2.7 Code's lead doesn't matter for your workload.
Last verified . 4 shared benchmarks.
Summary
- They share 4 benchmarks with published results for both. Grok 4.1 Fast scores higher in 2 categories and Kimi K2.7 Code in 3 categories; 5 gaps are clear of the uncertainty.
- The widest gap is in math, where Kimi K2.7 Code leads 52.9 to 31.9.
- Grok 4.1 Fast is cheaper at $0.20 / $0.50 per million input/output tokens, against $0.95 / $4 for Kimi K2.7 Code.
- Kimi K2.7 Code accepts more context: 262K tokens versus 128K.
- Kimi K2.7 Code has downloadable open weights; the other is API-only.
Side by side
| Grok 4.1 Fast | Kimi K2.7 Code | |
|---|---|---|
| Provider | xAI | Moonshot AI |
| Noometry Index | 41.4 | 43.3 |
| Released | 2025-06-27 | 2026-06-12 |
| Weights | Proprietary | Open |
| Context window | 128K | 262K |
| Max output | 30K | 262K |
| Input $ / M tokens | $0.20 | $0.95 |
| Output $ / M tokens | $0.50 | $4 |
| Results tracked | 32 | 19 |
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Category by category
Coding Kimi K2.7 Code leads
Grok 4.1 Fast: 34.1 (#245), Kimi K2.7 Code: 42.9 (#95)
| Benchmark | Grok 4.1 Fast | Kimi K2.7 Code |
|---|---|---|
| LMArena WebDev | 1242 | 1473 |
| ALE-Bench | 394.93 | 886.23 |
| DeepSWE | — | 30.5% |
| FrontierCode | — | 30.1% |
| SciCode | — | 47.5% |
| WeirdML | — | 54.1% |
| LMArena Coding | 1411 | — |
Agentic & Tool Use Grok 4.1 Fast leads
Grok 4.1 Fast: 36.3 (#39), Kimi K2.7 Code: 24.0 (#122)
| Benchmark | Grok 4.1 Fast | Kimi K2.7 Code |
|---|---|---|
| Vending-Bench 2 | 1,107 | 5,083 |
| APEX-Agents | — | 37.6% |
| Berkeley Function Calling Leaderboard | 69.6% | — |
| τ²-bench Banking | 13.1% | — |
| GBAEval | — | 0.9% |
| LMArena Search | 1171 | — |
Reasoning Grok 4.1 Fast leads
Grok 4.1 Fast: 43.4 (#49), Kimi K2.7 Code: 39.0 (#61)
| Benchmark | Grok 4.1 Fast | Kimi K2.7 Code |
|---|---|---|
| SimpleBench | 56% | 57.9% |
| NYT Connections (extended) | 87.4% | — |
| CritPt | — | 10% |
| Chess Puzzles | — | 21% |
| LMArena Hard Prompts | 1407 | — |
| DTBench | 87.7% | — |
| Surface Evolver Bench | — | 48.8% |
| Epoch Capabilities Index | — | 149.97 |
| ForecastBench | 61 | — |
Math Kimi K2.7 Code leads
Grok 4.1 Fast: 31.9 (#221), Kimi K2.7 Code: 52.9 (#48)
| Benchmark | Grok 4.1 Fast | Kimi K2.7 Code |
|---|---|---|
| FrontierMath (Tiers 1-3) | — | 54% |
| FrontierMath Tier 4 | — | 12.2% |
| MathArena Final-Answer Competitions | 60.9% | — |
| OTIS Mock AIME 2024-2025 | — | 95.6% |
| ProofBench | 4% | — |
| LMArena Math | 1408 | — |
Knowledge Kimi K2.7 Code leads
Grok 4.1 Fast: 33.1 (#207), Kimi K2.7 Code: 53.5 (#57)
| Benchmark | Grok 4.1 Fast | Kimi K2.7 Code |
|---|---|---|
| GPQA Diamond | — | 87.9% |
| SimpleQA Verified | — | 36.5% |
| Vectara Hallucination Rate | 17.8% | — |
| LMArena Expert | 1399 | — |
Multimodal Not comparable
Grok 4.1 Fast: 37.0 (#76), Kimi K2.7 Code: —
| Benchmark | Grok 4.1 Fast | Kimi K2.7 Code |
|---|---|---|
| LMArena Vision | 1201 | — |
Multilingual Not comparable
Grok 4.1 Fast: 51.0 (#114), Kimi K2.7 Code: —
| Benchmark | Grok 4.1 Fast | Kimi K2.7 Code |
|---|---|---|
| LMArena Non-English | 1391 | — |
| LMArena Chinese | 1441 | — |
| LMArena French | 1415 | — |
| LMArena German | 1404 | — |
| LMArena Japanese | 1349 | — |
| LMArena Korean | 1361 | — |
| LMArena Russian | 1387 | — |
| LMArena Spanish | 1413 | — |
Instruction Following Not comparable
Grok 4.1 Fast: 72.7 (#133), Kimi K2.7 Code: —
| Benchmark | Grok 4.1 Fast | Kimi K2.7 Code |
|---|---|---|
| LMArena Instruction Following | 1376 | — |
Long Context Not comparable
Grok 4.1 Fast: 42.4 (#126), Kimi K2.7 Code: —
| Benchmark | Grok 4.1 Fast | Kimi K2.7 Code |
|---|---|---|
| LMArena Longer Query | 1390 | — |
Writing & Preference Not comparable
Grok 4.1 Fast: 57.2 (#131), Kimi K2.7 Code: —
| Benchmark | Grok 4.1 Fast | Kimi K2.7 Code |
|---|---|---|
| LMArena Text | 1408 | — |
| LMArena Creative Writing | 1394 | — |
| EQ-Bench Creative Writing | 1327 | — |
| LMArena Multi-Turn | 1389 | — |
Frequently asked questions
Is Grok 4.1 Fast better than Kimi K2.7 Code?
Kimi K2.7 Code is the stronger model overall, scoring 43.3 to 41.4 on the Noometry Index. Grok 4.1 Fast costs 6.2× less per token, which makes it the better buy when Kimi K2.7 Code's lead doesn't matter for your workload.
Which is cheaper, Grok 4.1 Fast or Kimi K2.7 Code?
Grok 4.1 Fast is cheaper. It lists at $0.20 per million input tokens and $0.50 per million output tokens; Kimi K2.7 Code lists at $0.95 and $4.
Is Grok 4.1 Fast or Kimi K2.7 Code better for coding?
Kimi K2.7 Code scores higher on coding benchmarks: 42.9 versus 34.1 in the Noometry coding category.
Which has the bigger context window?
Kimi K2.7 Code does, with 262K tokens against 128K.
How many benchmarks do Grok 4.1 Fast and Kimi K2.7 Code share?
4 benchmarks have published results for both models. Grok 4.1 Fast has 32 scored results on Noometry and Kimi K2.7 Code has 19.