Model comparison
GPT-6.1 Sol vs Kimi K2.5 Instant
Kimi K2.5 Instant has enough public results to be ranked (#92); GPT-6.1 Sol does not yet, so treat this comparison as directional.
Last verified . 0 shared benchmarks.
Summary
- The widest gap is in coding, where GPT-6.1 Sol leads 51.4 to 42.3.
- Kimi K2.5 Instant has downloadable open weights; the other is API-only.
Side by side
| GPT-6.1 Sol | Kimi K2.5 Instant | |
|---|---|---|
| Provider | OpenAI | Moonshot AI |
| Noometry Index | 42.1 | 42.9 |
| Released | 2026-09-29 | — |
| Weights | Proprietary | Open |
| Context window | 1.05M | — |
| Max output | 128K | — |
| Input $ / M tokens | $2 | — |
| Output $ / M tokens | $10 | — |
| Results tracked | 2 | 18 |
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Category by category
Coding GPT-6.1 Sol leads
GPT-6.1 Sol: 51.4, Kimi K2.5 Instant: 42.3 (#95)
| Benchmark | GPT-6.1 Sol | Kimi K2.5 Instant |
|---|---|---|
| DeepSWE | 75.2% | — |
| LMArena WebDev | — | 1404 |
| LMArena Coding | — | 1483 |
Agentic & Tool Use Not comparable
GPT-6.1 Sol: 34.3, Kimi K2.5 Instant: —
| Benchmark | GPT-6.1 Sol | Kimi K2.5 Instant |
|---|---|---|
| GDP.pdf | 32% | — |
Reasoning Not comparable
GPT-6.1 Sol: —, Kimi K2.5 Instant: 28.5 (#88)
| Benchmark | GPT-6.1 Sol | Kimi K2.5 Instant |
|---|---|---|
| LMArena Hard Prompts | — | 1443 |
Math Not comparable
GPT-6.1 Sol: —, Kimi K2.5 Instant: 36.6 (#105)
| Benchmark | GPT-6.1 Sol | Kimi K2.5 Instant |
|---|---|---|
| LMArena Math | — | 1443 |
Knowledge Not comparable
GPT-6.1 Sol: —, Kimi K2.5 Instant: 39.5 (#121)
| Benchmark | GPT-6.1 Sol | Kimi K2.5 Instant |
|---|---|---|
| LMArena Expert | — | 1438 |
Multimodal Not comparable
GPT-6.1 Sol: —, Kimi K2.5 Instant: 39.5 (#47)
| Benchmark | GPT-6.1 Sol | Kimi K2.5 Instant |
|---|---|---|
| LMArena Vision | — | 1254 |
Multilingual Not comparable
GPT-6.1 Sol: —, Kimi K2.5 Instant: 52.2 (#89)
| Benchmark | GPT-6.1 Sol | Kimi K2.5 Instant |
|---|---|---|
| LMArena Non-English | — | 1406 |
| LMArena Chinese | — | 1450 |
| LMArena French | — | 1403 |
| LMArena German | — | 1413 |
| LMArena Korean | — | 1378 |
| LMArena Russian | — | 1404 |
| LMArena Spanish | — | 1448 |
Instruction Following Not comparable
GPT-6.1 Sol: —, Kimi K2.5 Instant: 75.5 (#61)
| Benchmark | GPT-6.1 Sol | Kimi K2.5 Instant |
|---|---|---|
| LMArena Instruction Following | — | 1430 |
Long Context Not comparable
GPT-6.1 Sol: —, Kimi K2.5 Instant: 43.8 (#82)
| Benchmark | GPT-6.1 Sol | Kimi K2.5 Instant |
|---|---|---|
| LMArena Longer Query | — | 1435 |
Writing & Preference Not comparable
GPT-6.1 Sol: —, Kimi K2.5 Instant: 60.8 (#91)
| Benchmark | GPT-6.1 Sol | Kimi K2.5 Instant |
|---|---|---|
| LMArena Text | — | 1420 |
| LMArena Creative Writing | — | 1379 |
| LMArena Multi-Turn | — | 1427 |
Frequently asked questions
Is GPT-6.1 Sol better than Kimi K2.5 Instant?
Kimi K2.5 Instant has enough public results to be ranked (#92); GPT-6.1 Sol does not yet, so treat this comparison as directional.
Is GPT-6.1 Sol or Kimi K2.5 Instant better for coding?
GPT-6.1 Sol scores higher on coding benchmarks: 51.4 versus 42.3 in the Noometry coding category.
How many benchmarks do GPT-6.1 Sol and Kimi K2.5 Instant share?
0 benchmarks have published results for both models. GPT-6.1 Sol has 2 scored results on Noometry and Kimi K2.5 Instant has 18.