Model comparison
GPT-6 Sol vs Kimi K2.5 Instant
GPT-6 Sol is the stronger model overall, scoring 61.8 to 43.6 on the Noometry Index.
Last verified . 18 shared benchmarks.
Summary
- They share 18 benchmarks with published results for both. GPT-6 Sol scores higher in 6 categories and Kimi K2.5 Instant in 3 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in math, where GPT-6 Sol leads 87.2 to 39.4.
- Kimi K2.5 Instant has downloadable open weights; the other is API-only.
Side by side
| GPT-6 Sol | Kimi K2.5 Instant | |
|---|---|---|
| Provider | OpenAI | Moonshot AI |
| Noometry Index | 61.8 | 43.6 |
| Released | 2026-09-22 | — |
| Weights | Proprietary | Open |
| Context window | 1.05M | — |
| Max output | 128K | — |
| Input $ / M tokens | $2 | — |
| Output $ / M tokens | $10 | — |
| Results tracked | 45 | 18 |
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Category by category
Coding GPT-6 Sol leads
GPT-6 Sol: 60.1 (#11), Kimi K2.5 Instant: 42.6 (#97)
| Benchmark | GPT-6 Sol | Kimi K2.5 Instant |
|---|---|---|
| LMArena WebDev | 1688 | 1404 |
| LMArena Coding | 1447 | 1484 |
| DeepSWE | 68.8% | — |
| FrontierCode | 49.3% | — |
| SciCode | 57.6% | — |
| ALE-Bench | 2,462 | — |
Agentic & Tool Use Not comparable
GPT-6 Sol: 37.2 (#36), Kimi K2.5 Instant: —
| Benchmark | GPT-6 Sol | Kimi K2.5 Instant |
|---|---|---|
| APEX-Agents | 54.3% | — |
| GDP.pdf | 26.4% | — |
| Vending-Bench 2 | 14,428 | — |
Reasoning GPT-6 Sol leads
GPT-6 Sol: 74.0 (#9), Kimi K2.5 Instant: 29.7 (#90)
| Benchmark | GPT-6 Sol | Kimi K2.5 Instant |
|---|---|---|
| LMArena Hard Prompts | 1418 | 1443 |
| ARC-AGI-2 | 89.6% | — |
| NYT Connections (extended) | 90.1% | — |
| ARC-AGI-1 | 95.5% | — |
| CritPt | 30.9% | — |
| EBR-Bench | 53.3% | — |
| Mystery Game Puzzles | 56% | — |
| DTBench | 97.3% | — |
| LMCA | 59.1% | — |
| Epoch Capabilities Index | 162.72 | — |
Math GPT-6 Sol leads
GPT-6 Sol: 87.2 (#7), Kimi K2.5 Instant: 39.4 (#105)
| Benchmark | GPT-6 Sol | Kimi K2.5 Instant |
|---|---|---|
| LMArena Math | 1402 | 1442 |
| FrontierMath (Tiers 1-3) | 89.8% | — |
| FrontierMath Tier 4 | 90% | — |
| OTIS Mock AIME 2024-2025 | 100% | — |
| ProofBench | 83% | — |
Knowledge GPT-6 Sol leads
GPT-6 Sol: 64.8 (#15), Kimi K2.5 Instant: 40.2 (#123)
| Benchmark | GPT-6 Sol | Kimi K2.5 Instant |
|---|---|---|
| LMArena Expert | 1439 | 1440 |
| GPQA Diamond | 94.3% | — |
| SimpleQA Verified | 60.7% | — |
| Vectara Hallucination Rate | 6.5% | — |
Multimodal GPT-6 Sol leads
GPT-6 Sol: 47.6 (#10), Kimi K2.5 Instant: 40.2 (#50)
| Benchmark | GPT-6 Sol | Kimi K2.5 Instant |
|---|---|---|
| LMArena Vision | 1245 | 1254 |
| Blueprint-Bench 2 | 36.9% | — |
| Furniture Assembly | 58.3% | — |
Multilingual Kimi K2.5 Instant leads
GPT-6 Sol: 50.5 (#118), Kimi K2.5 Instant: 52.0 (#94)
| Benchmark | GPT-6 Sol | Kimi K2.5 Instant |
|---|---|---|
| LMArena Non-English | 1385 | 1406 |
| LMArena Chinese | 1405 | 1449 |
| LMArena French | 1410 | 1403 |
| LMArena German | 1390 | 1413 |
| LMArena Korean | 1341 | 1378 |
| LMArena Russian | 1401 | 1404 |
| LMArena Spanish | 1384 | 1447 |
| LMArena Japanese | 1385 | — |
Instruction Following Too close to call
GPT-6 Sol: 74.5 (#94), Kimi K2.5 Instant: 75.3 (#65)
| Benchmark | GPT-6 Sol | Kimi K2.5 Instant |
|---|---|---|
| LMArena Instruction Following | 1412 | 1430 |
Long Context Too close to call
GPT-6 Sol: 43.1 (#108), Kimi K2.5 Instant: 43.9 (#83)
| Benchmark | GPT-6 Sol | Kimi K2.5 Instant |
|---|---|---|
| LMArena Longer Query | 1411 | 1435 |
Writing & Preference GPT-6 Sol leads
GPT-6 Sol: 71.9 (#18), Kimi K2.5 Instant: 60.6 (#95)
| Benchmark | GPT-6 Sol | Kimi K2.5 Instant |
|---|---|---|
| LMArena Text | 1395 | 1420 |
| LMArena Creative Writing | 1378 | 1381 |
| LMArena Multi-Turn | 1412 | 1427 |
| EQ-Bench Creative Writing | 2125 | — |
Frequently asked questions
Is GPT-6 Sol better than Kimi K2.5 Instant?
GPT-6 Sol is the stronger model overall, scoring 61.8 to 43.6 on the Noometry Index.
Is GPT-6 Sol or Kimi K2.5 Instant better for coding?
GPT-6 Sol scores higher on coding benchmarks: 60.1 versus 42.6 in the Noometry coding category.
How many benchmarks do GPT-6 Sol and Kimi K2.5 Instant share?
18 benchmarks have published results for both models. GPT-6 Sol has 45 scored results on Noometry and Kimi K2.5 Instant has 18.