Model comparison
GPT-6.1 Sol vs Kimi K2.5
Kimi K2.5 has enough public results to be ranked (#50); GPT-6.1 Sol does not yet, so treat this comparison as directional.
Last verified . 0 shared benchmarks.
Summary
- Kimi K2.5 is cheaper at $0.45 / $2.25 per million input/output tokens, against $2 / $10 for GPT-6.1 Sol.
- GPT-6.1 Sol accepts more context: 1.05M tokens versus 262K.
- Kimi K2.5 has downloadable open weights; the other is API-only.
Side by side
| GPT-6.1 Sol | Kimi K2.5 | |
|---|---|---|
| Provider | OpenAI | Moonshot AI |
| Noometry Index | 42.1 | 47.8 |
| Released | 2026-09-29 | 2026-01-27 |
| Weights | Proprietary | Open |
| Context window | 1.05M | 262K |
| Max output | 128K | 262K |
| Input $ / M tokens | $2 | $0.45 |
| Output $ / M tokens | $10 | $2.25 |
| Results tracked | 2 | 51 |
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Category by category
Coding GPT-6.1 Sol leads
GPT-6.1 Sol: 51.4, Kimi K2.5: 48.7 (#48)
| Benchmark | GPT-6.1 Sol | Kimi K2.5 |
|---|---|---|
| SWE-bench Verified | — | 73.8% |
| DeepSWE | 75.2% | — |
| SWE-bench Verified (bash only) | — | 70.8% |
| LMArena WebDev | — | 1436 |
| SWE-bench Multilingual | — | 67.3% |
| SciCode | — | 49% |
| WeirdML | — | 45.6% |
| LMArena Coding | — | 1474 |
| ALE-Bench | — | 821.65 |
Agentic & Tool Use Too close to call
GPT-6.1 Sol: 34.3, Kimi K2.5: 34.0 (#44)
| Benchmark | GPT-6.1 Sol | Kimi K2.5 |
|---|---|---|
| Terminal-Bench | — | 43.2% |
| OSWorld | — | 63.3% |
| GDP.pdf | 32% | — |
| Vending-Bench 2 | — | 1,198 |
Reasoning Not comparable
GPT-6.1 Sol: —, Kimi K2.5: 31.2 (#74)
| Benchmark | GPT-6.1 Sol | Kimi K2.5 |
|---|---|---|
| ARC-AGI-2 | — | 11.8% |
| SimpleBench | — | 46.8% |
| Kagi LLM Benchmark | — | 78.5% |
| NYT Connections (extended) | — | 69.9% |
| ARC-AGI-1 | — | 65.3% |
| CritPt | — | 3.1% |
| Chess Puzzles | — | 12% |
| EnigmaEval | — | 3.4% |
| Thematic Generalization | — | 69.4% |
| LMArena Hard Prompts | — | 1454 |
| Epoch Capabilities Index | — | 148.05 |
Math Not comparable
GPT-6.1 Sol: —, Kimi K2.5: 50.3 (#46)
| Benchmark | GPT-6.1 Sol | Kimi K2.5 |
|---|---|---|
| MathArena Final-Answer Competitions | — | 62.3% |
| OTIS Mock AIME 2024-2025 | — | 92.2% |
| LMArena Math | — | 1470 |
| FrontierMath (Feb 2025 set) | — | 27.9% |
| FrontierMath Tier 4 (v1) | — | 4.2% |
Knowledge Not comparable
GPT-6.1 Sol: —, Kimi K2.5: 53.6 (#52)
| Benchmark | GPT-6.1 Sol | Kimi K2.5 |
|---|---|---|
| GPQA Diamond | — | 87.6% |
| Humanity's Last Exam | — | 24.4% |
| SimpleQA Verified | — | 34.3% |
| Vectara Hallucination Rate | — | 14.2% |
| LMArena Expert | — | 1466 |
Multimodal Not comparable
GPT-6.1 Sol: —, Kimi K2.5: 40.4 (#37)
| Benchmark | GPT-6.1 Sol | Kimi K2.5 |
|---|---|---|
| LMArena Vision | — | 1269 |
| LMArena Document | — | 1430 |
Multilingual Not comparable
GPT-6.1 Sol: —, Kimi K2.5: 54.1 (#50)
| Benchmark | GPT-6.1 Sol | Kimi K2.5 |
|---|---|---|
| LMArena Non-English | — | 1433 |
| LMArena Chinese | — | 1495 |
| LMArena French | — | 1454 |
| LMArena German | — | 1441 |
| LMArena Japanese | — | 1422 |
| LMArena Korean | — | 1412 |
| LMArena Russian | — | 1436 |
| LMArena Spanish | — | 1450 |
Instruction Following Not comparable
GPT-6.1 Sol: —, Kimi K2.5: 75.5 (#60)
| Benchmark | GPT-6.1 Sol | Kimi K2.5 |
|---|---|---|
| LMArena Instruction Following | — | 1431 |
Long Context Not comparable
GPT-6.1 Sol: —, Kimi K2.5: 52.1 (#7)
| Benchmark | GPT-6.1 Sol | Kimi K2.5 |
|---|---|---|
| Fiction.LiveBench | — | 86.1% |
| CL-bench | — | 19.3% |
| CL-bench Life | — | 13.2% |
| LMArena Longer Query | — | 1445 |
Writing & Preference Not comparable
GPT-6.1 Sol: —, Kimi K2.5: 65.3 (#51)
| Benchmark | GPT-6.1 Sol | Kimi K2.5 |
|---|---|---|
| LMArena Text | — | 1445 |
| LMArena Creative Writing | — | 1423 |
| EQ-Bench Creative Writing | — | 1579 |
| LMArena Multi-Turn | — | 1444 |
Frequently asked questions
Is GPT-6.1 Sol better than Kimi K2.5?
Kimi K2.5 has enough public results to be ranked (#50); GPT-6.1 Sol does not yet, so treat this comparison as directional.
Which is cheaper, GPT-6.1 Sol or Kimi K2.5?
Kimi K2.5 is cheaper. It lists at $0.45 per million input tokens and $2.25 per million output tokens; GPT-6.1 Sol lists at $2 and $10.
Is GPT-6.1 Sol or Kimi K2.5 better for coding?
GPT-6.1 Sol scores higher on coding benchmarks: 51.4 versus 48.7 in the Noometry coding category.
Which has the bigger context window?
GPT-6.1 Sol does, with 1.05M tokens against 262K.
How many benchmarks do GPT-6.1 Sol and Kimi K2.5 share?
0 benchmarks have published results for both models. GPT-6.1 Sol has 2 scored results on Noometry and Kimi K2.5 has 51.