Model comparison
GPT-5.5 Pro vs Kimi K2.6
GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 47.7 on the Noometry Index. Kimi K2.6 costs 39× less per token, which makes it the better buy when GPT-5.5 Pro's lead doesn't matter for your workload.
Last verified . 11 shared benchmarks.
Summary
- They share 11 benchmarks with published results for both. GPT-5.5 Pro scores higher in 3 categories and Kimi K2.6 in 0 categories; 3 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where GPT-5.5 Pro leads 73.3 to 40.5.
- The biggest single-benchmark swing is FrontierMath Tier 4: 78% for GPT-5.5 Pro and 25.6% for Kimi K2.6.
- Kimi K2.6 is cheaper at $0.95 / $4 per million input/output tokens, against $30 / $180 for GPT-5.5 Pro.
- GPT-5.5 Pro accepts more context: 1.05M tokens versus 262K.
- Kimi K2.6 has downloadable open weights; the other is API-only.
Side by side
| GPT-5.5 Pro | Kimi K2.6 | |
|---|---|---|
| Provider | OpenAI | Moonshot AI |
| Noometry Index | 64.3 | 47.7 |
| Released | 2026-04-23 | 2026-04-20 |
| Weights | Proprietary | Open |
| Context window | 1.05M | 262K |
| Max output | 128K | 262K |
| Input $ / M tokens | $30 | $0.95 |
| Output $ / M tokens | $180 | $4 |
| Results tracked | 14 | 51 |
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Category by category
Coding Not comparable
GPT-5.5 Pro: —, Kimi K2.6: 50.7 (#43)
| Benchmark | GPT-5.5 Pro | Kimi K2.6 |
|---|---|---|
| SWE-bench Verified | — | 76.7% |
| LMArena WebDev | — | 1509 |
| SciCode | — | 53.5% |
| WeirdML | — | 55.9% |
| LMArena Coding | — | 1488 |
| ALE-Bench | — | 1,093 |
Agentic & Tool Use Not comparable
GPT-5.5 Pro: —, Kimi K2.6: 21.9 (#137)
| Benchmark | GPT-5.5 Pro | Kimi K2.6 |
|---|---|---|
| OSWorld 2.0 | — | 4.6% |
| ExploitBench | — | 18.4% |
| GBAEval | — | 0.9% |
| GDP.pdf | — | 12% |
| Vending-Bench 2 | — | 6,205 |
Reasoning GPT-5.5 Pro leads
GPT-5.5 Pro: 73.3 (#10), Kimi K2.6: 40.5 (#55)
| Benchmark | GPT-5.5 Pro | Kimi K2.6 |
|---|---|---|
| CritPt | 30.6% | 8% |
| Chess Puzzles | 64% | 26% |
| DTBench | 96% | 90.9% |
| LMCA | 53.9% | 37.3% |
| Epoch Capabilities Index | 162.07 | 151.05 |
| ARC-AGI-2 | 84.6% | — |
| SimpleBench | 76.9% | — |
| NYT Connections (extended) | — | 87.2% |
| ARC-AGI-1 | 96.5% | — |
| EBR-Bench | — | 2.4% |
| LMArena Hard Prompts | — | 1470 |
| Mystery Game Puzzles | — | 18% |
Math GPT-5.5 Pro leads
GPT-5.5 Pro: 84.0 (#10), Kimi K2.6: 57.0 (#41)
| Benchmark | GPT-5.5 Pro | Kimi K2.6 |
|---|---|---|
| FrontierMath (Tiers 1-3) | 87.7% | 57.2% |
| FrontierMath Tier 4 | 78% | 25.6% |
| OTIS Mock AIME 2024-2025 | 100% | 96.1% |
| FrontierMath (Feb 2025 set) | 52.4% | 39% |
| FrontierMath Tier 4 (v1) | 39.6% | 14.6% |
| MathArena Final-Answer Competitions | — | 72.9% |
| ProofBench | — | 16% |
| LMArena Math | — | 1475 |
Knowledge GPT-5.5 Pro leads
GPT-5.5 Pro: 64.1 (#19), Kimi K2.6: 54.0 (#54)
| Benchmark | GPT-5.5 Pro | Kimi K2.6 |
|---|---|---|
| GPQA Diamond | 93.9% | 90.8% |
| SimpleQA Verified | — | 34.9% |
| Vectara Hallucination Rate | — | 10.8% |
| LMArena Expert | — | 1491 |
Multimodal Not comparable
GPT-5.5 Pro: —, Kimi K2.6: 31.6 (#103)
| Benchmark | GPT-5.5 Pro | Kimi K2.6 |
|---|---|---|
| LMArena Vision | — | 1283 |
| Blueprint-Bench 2 | — | 3.9% |
| Furniture Assembly | — | 21.7% |
| LMArena Document | — | 1451 |
Multilingual Not comparable
GPT-5.5 Pro: —, Kimi K2.6: 54.9 (#37)
| Benchmark | GPT-5.5 Pro | Kimi K2.6 |
|---|---|---|
| LMArena Non-English | — | 1446 |
| LMArena Chinese | — | 1521 |
| LMArena French | — | 1471 |
| LMArena German | — | 1450 |
| LMArena Japanese | — | 1443 |
| LMArena Korean | — | 1427 |
| LMArena Russian | — | 1446 |
| LMArena Spanish | — | 1464 |
Instruction Following Not comparable
GPT-5.5 Pro: —, Kimi K2.6: 76.3 (#43)
| Benchmark | GPT-5.5 Pro | Kimi K2.6 |
|---|---|---|
| LMArena Instruction Following | — | 1451 |
Long Context Not comparable
GPT-5.5 Pro: —, Kimi K2.6: 44.9 (#52)
| Benchmark | GPT-5.5 Pro | Kimi K2.6 |
|---|---|---|
| LMArena Longer Query | — | 1468 |
Writing & Preference Not comparable
GPT-5.5 Pro: —, Kimi K2.6: 68.5 (#26)
| Benchmark | GPT-5.5 Pro | Kimi K2.6 |
|---|---|---|
| LMArena Text | — | 1455 |
| LMArena Creative Writing | — | 1434 |
| EQ-Bench Creative Writing | — | 1725 |
| EQ-Bench 4 | — | 1202 |
| LMArena Multi-Turn | — | 1453 |
Frequently asked questions
Is GPT-5.5 Pro better than Kimi K2.6?
GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 47.7 on the Noometry Index. Kimi K2.6 costs 39× less per token, which makes it the better buy when GPT-5.5 Pro's lead doesn't matter for your workload.
Which is cheaper, GPT-5.5 Pro or Kimi K2.6?
Kimi K2.6 is cheaper. It lists at $0.95 per million input tokens and $4 per million output tokens; GPT-5.5 Pro lists at $30 and $180.
Which has the bigger context window?
GPT-5.5 Pro does, with 1.05M tokens against 262K.
How many benchmarks do GPT-5.5 Pro and Kimi K2.6 share?
11 benchmarks have published results for both models. GPT-5.5 Pro has 14 scored results on Noometry and Kimi K2.6 has 51.