Model comparison
GPT-5 Nano vs Kimi K2.6
Kimi K2.6 is the stronger model overall, scoring 47.7 to 33.5 on the Noometry Index. GPT-5 Nano costs 12× less per token, which makes it the better buy when Kimi K2.6's lead doesn't matter for your workload.
Last verified . 34 shared benchmarks.
Summary
- They share 34 benchmarks with published results for both. GPT-5 Nano scores higher in 1 category and Kimi K2.6 in 9 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where Kimi K2.6 leads 68.5 to 39.1.
- The biggest single-benchmark swing is FrontierMath (Tiers 1-3): 20% for GPT-5 Nano and 57.2% for Kimi K2.6.
- GPT-5 Nano is cheaper at $0.05 / $0.40 per million input/output tokens, against $0.95 / $4 for Kimi K2.6.
- GPT-5 Nano accepts more context: 400K tokens versus 262K.
- Kimi K2.6 has downloadable open weights; the other is API-only.
Side by side
| GPT-5 Nano | Kimi K2.6 | |
|---|---|---|
| Provider | OpenAI | Moonshot AI |
| Noometry Index | 33.5 | 47.7 |
| Released | 2025-08-07 | 2026-04-20 |
| Weights | Proprietary | Open |
| Context window | 400K | 262K |
| Max output | 128K | 262K |
| Input $ / M tokens | $0.05 | $0.95 |
| Output $ / M tokens | $0.40 | $4 |
| Results tracked | 49 | 51 |
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Category by category
Coding Kimi K2.6 leads
GPT-5 Nano: 33.6 (#254), Kimi K2.6: 50.7 (#43)
| Benchmark | GPT-5 Nano | Kimi K2.6 |
|---|---|---|
| WeirdML | 38.1% | 55.9% |
| LMArena Coding | 1351 | 1488 |
| ALE-Bench | 718.67 | 1,093 |
| SWE-bench Verified | — | 76.7% |
| SWE-bench Verified (bash only) | 34.8% | — |
| LMArena WebDev | — | 1509 |
| SciCode | — | 53.5% |
Agentic & Tool Use GPT-5 Nano leads
GPT-5 Nano: 25.8 (#106), Kimi K2.6: 21.9 (#137)
| Benchmark | GPT-5 Nano | Kimi K2.6 |
|---|---|---|
| Terminal-Bench | 21.8% | — |
| Berkeley Function Calling Leaderboard | 51.5% | — |
| OSWorld 2.0 | — | 4.6% |
| ExploitBench | — | 18.4% |
| GBAEval | — | 0.9% |
| GDP.pdf | — | 12% |
| Vending-Bench 2 | — | 6,205 |
Reasoning Kimi K2.6 leads
GPT-5 Nano: 16.3 (#306), Kimi K2.6: 40.5 (#55)
| Benchmark | GPT-5 Nano | Kimi K2.6 |
|---|---|---|
| Chess Puzzles | 27% | 26% |
| LMArena Hard Prompts | 1328 | 1470 |
| Mystery Game Puzzles | 9% | 18% |
| DTBench | 62.7% | 90.9% |
| LMCA | 7.9% | 37.3% |
| Epoch Capabilities Index | 139.38 | 151.05 |
| ARC-AGI-2 | 2.6% | — |
| Kagi LLM Benchmark | 62.2% | — |
| NYT Connections (extended) | — | 87.2% |
| ARC-AGI-1 | 20.7% | — |
| CritPt | — | 8% |
| EBR-Bench | — | 2.4% |
| ForecastBench | 59.1 | — |
Math Kimi K2.6 leads
GPT-5 Nano: 29.4 (#241), Kimi K2.6: 57.0 (#41)
| Benchmark | GPT-5 Nano | Kimi K2.6 |
|---|---|---|
| FrontierMath (Tiers 1-3) | 20% | 57.2% |
| FrontierMath Tier 4 | 2.4% | 25.6% |
| OTIS Mock AIME 2024-2025 | 81.1% | 96.1% |
| ProofBench | 12% | 16% |
| LMArena Math | 1317 | 1475 |
| FrontierMath (Feb 2025 set) | 8.3% | 39% |
| FrontierMath Tier 4 (v1) | 2.1% | 14.6% |
| MathArena Final-Answer Competitions | — | 72.9% |
| Omni-MATH | 54.6% | — |
| MATH Level 5 | 95.2% | — |
Knowledge Kimi K2.6 leads
GPT-5 Nano: 35.9 (#178), Kimi K2.6: 54.0 (#54)
| Benchmark | GPT-5 Nano | Kimi K2.6 |
|---|---|---|
| GPQA Diamond | 69.4% | 90.8% |
| SimpleQA Verified | 11.7% | 34.9% |
| Vectara Hallucination Rate | 10.5% | 10.8% |
| LMArena Expert | 1321 | 1491 |
| MMLU-Pro | 77.8% | — |
| GPQA (HELM) | 67.9% | — |
Multimodal Too close to call
GPT-5 Nano: 31.3 (#108), Kimi K2.6: 31.6 (#103)
| Benchmark | GPT-5 Nano | Kimi K2.6 |
|---|---|---|
| LMArena Vision | 1159 | 1283 |
| VPCT | 37.2% | — |
| Blueprint-Bench 2 | — | 3.9% |
| Furniture Assembly | — | 21.7% |
| LMArena Document | — | 1451 |
Multilingual Kimi K2.6 leads
GPT-5 Nano: 45.3 (#172), Kimi K2.6: 54.9 (#37)
| Benchmark | GPT-5 Nano | Kimi K2.6 |
|---|---|---|
| LMArena Non-English | 1313 | 1446 |
| LMArena Chinese | 1356 | 1521 |
| LMArena German | 1327 | 1450 |
| LMArena Japanese | 1226 | 1443 |
| LMArena Korean | 1269 | 1427 |
| LMArena Russian | 1296 | 1446 |
| LMArena Spanish | 1360 | 1464 |
| LMArena French | — | 1471 |
Instruction Following Kimi K2.6 leads
GPT-5 Nano: 75.0 (#79), Kimi K2.6: 76.3 (#43)
| Benchmark | GPT-5 Nano | Kimi K2.6 |
|---|---|---|
| LMArena Instruction Following | 1306 | 1451 |
| IFEval | 93.2% | — |
Long Context Kimi K2.6 leads
GPT-5 Nano: 31.3 (#281), Kimi K2.6: 44.9 (#52)
| Benchmark | GPT-5 Nano | Kimi K2.6 |
|---|---|---|
| LMArena Longer Query | 1312 | 1468 |
| Fiction.LiveBench | 44.4% | — |
Writing & Preference Kimi K2.6 leads
GPT-5 Nano: 39.1 (#249), Kimi K2.6: 68.5 (#26)
| Benchmark | GPT-5 Nano | Kimi K2.6 |
|---|---|---|
| LMArena Text | 1320 | 1455 |
| LMArena Creative Writing | 1249 | 1434 |
| EQ-Bench Creative Writing | 705 | 1725 |
| LMArena Multi-Turn | 1311 | 1453 |
| WildBench | 80.6% | — |
| EQ-Bench 4 | — | 1202 |
Frequently asked questions
Is GPT-5 Nano better than Kimi K2.6?
Kimi K2.6 is the stronger model overall, scoring 47.7 to 33.5 on the Noometry Index. GPT-5 Nano costs 12× less per token, which makes it the better buy when Kimi K2.6's lead doesn't matter for your workload.
Which is cheaper, GPT-5 Nano or Kimi K2.6?
GPT-5 Nano is cheaper. It lists at $0.05 per million input tokens and $0.40 per million output tokens; Kimi K2.6 lists at $0.95 and $4.
Is GPT-5 Nano or Kimi K2.6 better for coding?
Kimi K2.6 scores higher on coding benchmarks: 50.7 versus 33.6 in the Noometry coding category.
Which has the bigger context window?
GPT-5 Nano does, with 400K tokens against 262K.
How many benchmarks do GPT-5 Nano and Kimi K2.6 share?
34 benchmarks have published results for both models. GPT-5 Nano has 49 scored results on Noometry and Kimi K2.6 has 51.