Model comparison
GPT-5.1 vs Kimi K2.7 Code
GPT-5.1 is the stronger model overall, scoring 49.0 to 43.3 on the Noometry Index. Kimi K2.7 Code costs 2.0× less per token, which makes it the better buy when GPT-5.1's lead doesn't matter for your workload.
Last verified . 12 shared benchmarks.
Summary
- They share 12 benchmarks with published results for both. GPT-5.1 scores higher in 3 categories and Kimi K2.7 Code in 2 categories; 3 gaps are clear of the uncertainty.
- The widest gap is in agentic & tool use, where GPT-5.1 leads 32.7 to 24.0.
- The biggest single-benchmark swing is SimpleQA Verified: 48% for GPT-5.1 and 36.5% for Kimi K2.7 Code.
- Kimi K2.7 Code is cheaper at $0.95 / $4 per million input/output tokens, against $1.25 / $10 for GPT-5.1.
- GPT-5.1 accepts more context: 400K tokens versus 262K.
- Kimi K2.7 Code has downloadable open weights; the other is API-only.
Side by side
| GPT-5.1 | Kimi K2.7 Code | |
|---|---|---|
| Provider | OpenAI | Moonshot AI |
| Noometry Index | 49.0 | 43.3 |
| Released | 2025-11-13 | 2026-06-12 |
| Weights | Proprietary | Open |
| Context window | 400K | 262K |
| Max output | 128K | 262K |
| Input $ / M tokens | $1.25 | $0.95 |
| Output $ / M tokens | $10 | $4 |
| Results tracked | 63 | 19 |
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Category by category
Coding GPT-5.1 leads
GPT-5.1: 46.4 (#66), Kimi K2.7 Code: 42.9 (#95)
| Benchmark | GPT-5.1 | Kimi K2.7 Code |
|---|---|---|
| LMArena WebDev | 1395 | 1473 |
| SciCode | 43.3% | 47.5% |
| WeirdML | 60.8% | 54.1% |
| ALE-Bench | 1,192 | 886.23 |
| SWE-bench Verified | 68% | — |
| DeepSWE | — | 30.5% |
| FrontierCode | — | 30.1% |
| SWE-bench Verified (bash only) | 66% | — |
| GSO | 13.7% | — |
| LiveBench Coding | 72.5% | — |
| LMArena Coding | 1454 | — |
Agentic & Tool Use GPT-5.1 leads
GPT-5.1: 32.7 (#60), Kimi K2.7 Code: 24.0 (#122)
| Benchmark | GPT-5.1 | Kimi K2.7 Code |
|---|---|---|
| Vending-Bench 2 | 1,473 | 5,083 |
| Terminal-Bench | 47.6% | — |
| APEX-Agents | — | 37.6% |
| DeepResearch Bench | 42.8% | — |
| GBAEval | — | 0.9% |
| LMArena Search | 1199 | — |
Reasoning Too close to call
GPT-5.1: 39.8 (#58), Kimi K2.7 Code: 39.0 (#61)
| Benchmark | GPT-5.1 | Kimi K2.7 Code |
|---|---|---|
| SimpleBench | 53.2% | 57.9% |
| CritPt | 4.9% | 10% |
| Chess Puzzles | 32% | 21% |
| Epoch Capabilities Index | 149.64 | 149.97 |
| ARC-AGI-2 | 17.6% | — |
| ARC-AGI-1 | 72.8% | — |
| EnigmaEval | 11.2% | — |
| LiveBench Reasoning | 95.8% | — |
| LMArena Hard Prompts | 1457 | — |
| Mystery Game Puzzles | 19% | — |
| DTBench | 90.1% | — |
| LiveBench Data Analysis | 72.1% | — |
| LMCA | 43.9% | — |
| Surface Evolver Bench | — | 48.8% |
| ForecastBench | 58.1 | — |
| LiveBench | 78.8% | — |
Math Too close to call
GPT-5.1: 52.2 (#51), Kimi K2.7 Code: 52.9 (#48)
| Benchmark | GPT-5.1 | Kimi K2.7 Code |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 88.6% | 95.6% |
| FrontierMath (Tiers 1-3) | — | 54% |
| FrontierMath Tier 4 | — | 12.2% |
| Omni-MATH | 46.4% | — |
| LiveBench Math | 94.5% | — |
| LMArena Math | 1447 | — |
| FrontierMath (Feb 2025 set) | 31% | — |
| FrontierMath Tier 4 (v1) | 12.5% | — |
Knowledge Kimi K2.7 Code leads
GPT-5.1: 50.6 (#71), Kimi K2.7 Code: 53.5 (#57)
| Benchmark | GPT-5.1 | Kimi K2.7 Code |
|---|---|---|
| GPQA Diamond | 87.6% | 87.9% |
| SimpleQA Verified | 48% | 36.5% |
| Humanity's Last Exam | 23.7% | — |
| MMLU-Pro | 57.9% | — |
| Vectara Hallucination Rate | 10.9% | — |
| GPQA (HELM) | 44.2% | — |
| LMArena Expert | 1470 | — |
Multimodal Not comparable
GPT-5.1: 44.8 (#19), Kimi K2.7 Code: —
| Benchmark | GPT-5.1 | Kimi K2.7 Code |
|---|---|---|
| LMArena Vision | 1250 | — |
| VPCT | 58.7% | — |
| LMArena Document | 1403 | — |
Multilingual Not comparable
GPT-5.1: 53.8 (#56), Kimi K2.7 Code: —
| Benchmark | GPT-5.1 | Kimi K2.7 Code |
|---|---|---|
| LMArena Non-English | 1431 | — |
| LMArena Chinese | 1495 | — |
| LMArena French | 1450 | — |
| LMArena German | 1438 | — |
| LMArena Japanese | 1453 | — |
| LMArena Korean | 1401 | — |
| LMArena Russian | 1435 | — |
| LMArena Spanish | 1433 | — |
Instruction Following Not comparable
GPT-5.1: 83.9 (#1), Kimi K2.7 Code: —
| Benchmark | GPT-5.1 | Kimi K2.7 Code |
|---|---|---|
| LiveBench Instruction Following | 93.3% | — |
| IFEval | 93.5% | — |
| LMArena Instruction Following | 1443 | — |
Long Context Not comparable
GPT-5.1: 47.6 (#14), Kimi K2.7 Code: —
| Benchmark | GPT-5.1 | Kimi K2.7 Code |
|---|---|---|
| CL-bench | 23.7% | — |
| CL-bench Life | 17.3% | — |
| LMArena Longer Query | 1447 | — |
Writing & Preference Not comparable
GPT-5.1: 64.5 (#55), Kimi K2.7 Code: —
| Benchmark | GPT-5.1 | Kimi K2.7 Code |
|---|---|---|
| LMArena Text | 1443 | — |
| LMArena Creative Writing | 1427 | — |
| WildBench | 86.3% | — |
| LMArena Multi-Turn | 1450 | — |
| LiveBench Language | 80.2% | — |
Frequently asked questions
Is GPT-5.1 better than Kimi K2.7 Code?
GPT-5.1 is the stronger model overall, scoring 49.0 to 43.3 on the Noometry Index. Kimi K2.7 Code costs 2.0× less per token, which makes it the better buy when GPT-5.1's lead doesn't matter for your workload.
Which is cheaper, GPT-5.1 or Kimi K2.7 Code?
Kimi K2.7 Code is cheaper. It lists at $0.95 per million input tokens and $4 per million output tokens; GPT-5.1 lists at $1.25 and $10.
Is GPT-5.1 or Kimi K2.7 Code better for coding?
GPT-5.1 scores higher on coding benchmarks: 46.4 versus 42.9 in the Noometry coding category.
Which has the bigger context window?
GPT-5.1 does, with 400K tokens against 262K.
How many benchmarks do GPT-5.1 and Kimi K2.7 Code share?
12 benchmarks have published results for both models. GPT-5.1 has 63 scored results on Noometry and Kimi K2.7 Code has 19.