Model comparison
GPT-5.5 Pro vs Kimi K2.5 Instant
GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 43.6 on the Noometry Index.
Last verified . 0 shared benchmarks.
Summary
- The widest gap is in math, where GPT-5.5 Pro leads 84.0 to 39.4.
- Kimi K2.5 Instant has downloadable open weights; the other is API-only.
Side by side
| GPT-5.5 Pro | Kimi K2.5 Instant | |
|---|---|---|
| Provider | OpenAI | Moonshot AI |
| Noometry Index | 64.3 | 43.6 |
| Released | 2026-04-23 | — |
| Weights | Proprietary | Open |
| Context window | 1.05M | — |
| Max output | 128K | — |
| Input $ / M tokens | $30 | — |
| Output $ / M tokens | $180 | — |
| Results tracked | 14 | 18 |
Sponsored placements are available on pages like this one. Advertise on Noometry
Category by category
Coding Not comparable
GPT-5.5 Pro: —, Kimi K2.5 Instant: 42.6 (#97)
| Benchmark | GPT-5.5 Pro | Kimi K2.5 Instant |
|---|---|---|
| LMArena WebDev | — | 1404 |
| LMArena Coding | — | 1484 |
Reasoning GPT-5.5 Pro leads
GPT-5.5 Pro: 73.3 (#10), Kimi K2.5 Instant: 29.7 (#90)
| Benchmark | GPT-5.5 Pro | Kimi K2.5 Instant |
|---|---|---|
| ARC-AGI-2 | 84.6% | — |
| SimpleBench | 76.9% | — |
| ARC-AGI-1 | 96.5% | — |
| CritPt | 30.6% | — |
| Chess Puzzles | 64% | — |
| LMArena Hard Prompts | — | 1443 |
| DTBench | 96% | — |
| LMCA | 53.9% | — |
| Epoch Capabilities Index | 162.07 | — |
Math GPT-5.5 Pro leads
GPT-5.5 Pro: 84.0 (#10), Kimi K2.5 Instant: 39.4 (#105)
| Benchmark | GPT-5.5 Pro | Kimi K2.5 Instant |
|---|---|---|
| FrontierMath (Tiers 1-3) | 87.7% | — |
| FrontierMath Tier 4 | 78% | — |
| OTIS Mock AIME 2024-2025 | 100% | — |
| LMArena Math | — | 1442 |
| FrontierMath (Feb 2025 set) | 52.4% | — |
| FrontierMath Tier 4 (v1) | 39.6% | — |
Knowledge GPT-5.5 Pro leads
GPT-5.5 Pro: 64.1 (#19), Kimi K2.5 Instant: 40.2 (#123)
| Benchmark | GPT-5.5 Pro | Kimi K2.5 Instant |
|---|---|---|
| GPQA Diamond | 93.9% | — |
| LMArena Expert | — | 1440 |
Multimodal Not comparable
GPT-5.5 Pro: —, Kimi K2.5 Instant: 40.2 (#50)
| Benchmark | GPT-5.5 Pro | Kimi K2.5 Instant |
|---|---|---|
| LMArena Vision | — | 1254 |
Multilingual Not comparable
GPT-5.5 Pro: —, Kimi K2.5 Instant: 52.0 (#94)
| Benchmark | GPT-5.5 Pro | Kimi K2.5 Instant |
|---|---|---|
| LMArena Non-English | — | 1406 |
| LMArena Chinese | — | 1449 |
| LMArena French | — | 1403 |
| LMArena German | — | 1413 |
| LMArena Korean | — | 1378 |
| LMArena Russian | — | 1404 |
| LMArena Spanish | — | 1447 |
Instruction Following Not comparable
GPT-5.5 Pro: —, Kimi K2.5 Instant: 75.3 (#65)
| Benchmark | GPT-5.5 Pro | Kimi K2.5 Instant |
|---|---|---|
| LMArena Instruction Following | — | 1430 |
Long Context Not comparable
GPT-5.5 Pro: —, Kimi K2.5 Instant: 43.9 (#83)
| Benchmark | GPT-5.5 Pro | Kimi K2.5 Instant |
|---|---|---|
| LMArena Longer Query | — | 1435 |
Writing & Preference Not comparable
GPT-5.5 Pro: —, Kimi K2.5 Instant: 60.6 (#95)
| Benchmark | GPT-5.5 Pro | Kimi K2.5 Instant |
|---|---|---|
| LMArena Text | — | 1420 |
| LMArena Creative Writing | — | 1381 |
| LMArena Multi-Turn | — | 1427 |
Frequently asked questions
Is GPT-5.5 Pro better than Kimi K2.5 Instant?
GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 43.6 on the Noometry Index.
How many benchmarks do GPT-5.5 Pro and Kimi K2.5 Instant share?
0 benchmarks have published results for both models. GPT-5.5 Pro has 14 scored results on Noometry and Kimi K2.5 Instant has 18.