Model comparison
Gemini 2.5 Flash vs Kimi K2.5 Instant
Kimi K2.5 Instant is the stronger model overall, scoring 43.6 to 39.3 on the Noometry Index.
Last verified . 17 shared benchmarks.
GoogleSummary
- They share 17 benchmarks with published results for both. Gemini 2.5 Flash scores higher in 5 categories and Kimi K2.5 Instant in 4 categories; 6 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Kimi K2.5 Instant leads 29.7 to 18.1.
- Kimi K2.5 Instant has downloadable open weights; the other is API-only.
Side by side
| Gemini 2.5 Flash | Kimi K2.5 Instant | |
|---|---|---|
| Provider | Moonshot AI | |
| Noometry Index | 39.3 | 43.6 |
| Released | 2025-04-17 | — |
| Weights | Proprietary | Open |
| Context window | 1.05M | — |
| Max output | 66K | — |
| Input $ / M tokens | $0.30 | — |
| Output $ / M tokens | $2.50 | — |
| Results tracked | 54 | 18 |
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Category by category
Coding Kimi K2.5 Instant leads
Gemini 2.5 Flash: 35.8 (#220), Kimi K2.5 Instant: 42.6 (#97)
| Benchmark | Gemini 2.5 Flash | Kimi K2.5 Instant |
|---|---|---|
| LMArena Coding | 1424 | 1484 |
| SWE-bench Verified (bash only) | 28.7% | — |
| Aider Polyglot | 55.1% | — |
| LMArena WebDev | — | 1404 |
| WeirdML | 41.9% | — |
| ALE-Bench | 661.88 | — |
Agentic & Tool Use Not comparable
Gemini 2.5 Flash: 30.8 (#74), Kimi K2.5 Instant: —
| Benchmark | Gemini 2.5 Flash | Kimi K2.5 Instant |
|---|---|---|
| Terminal-Bench | 17.1% | — |
| Berkeley Function Calling Leaderboard | 56.2% | — |
| TheAgentCompany | 41.1% | — |
| BALROG | 33.5% | — |
| Vending-Bench 2 | 548.84 | — |
Reasoning Kimi K2.5 Instant leads
Gemini 2.5 Flash: 18.1 (#286), Kimi K2.5 Instant: 29.7 (#90)
| Benchmark | Gemini 2.5 Flash | Kimi K2.5 Instant |
|---|---|---|
| LMArena Hard Prompts | 1422 | 1443 |
| ARC-AGI-2 | 2.5% | — |
| SimpleBench | 41.2% | — |
| Kagi LLM Benchmark | 56.8% | — |
| ARC-AGI-1 | 33.3% | — |
| CritPt | 1.1% | — |
| EnigmaEval | 2.7% | — |
| DTBench | 76.5% | — |
| LMCA | 27.5% | — |
| Epoch Capabilities Index | 143.03 | — |
| ForecastBench | 60.6 | — |
Math Too close to call
Gemini 2.5 Flash: 39.9 (#98), Kimi K2.5 Instant: 39.4 (#105)
| Benchmark | Gemini 2.5 Flash | Kimi K2.5 Instant |
|---|---|---|
| LMArena Math | 1415 | 1442 |
| OTIS Mock AIME 2024-2025 | 73.1% | — |
| Omni-MATH | 38.5% | — |
| FrontierMath (Feb 2025 set) | 4.8% | — |
| FrontierMath Tier 4 (v1) | 4.2% | — |
Knowledge Kimi K2.5 Instant leads
Gemini 2.5 Flash: 36.4 (#168), Kimi K2.5 Instant: 40.2 (#123)
| Benchmark | Gemini 2.5 Flash | Kimi K2.5 Instant |
|---|---|---|
| LMArena Expert | 1426 | 1440 |
| Humanity's Last Exam | 12.1% | — |
| MMLU-Pro | 63.9% | — |
| Confabulations | 16.8% | — |
| Vectara Hallucination Rate | 7.8% | — |
| GPQA (HELM) | 39% | — |
Multimodal Gemini 2.5 Flash leads
Gemini 2.5 Flash: 41.8 (#32), Kimi K2.5 Instant: 40.2 (#50)
| Benchmark | Gemini 2.5 Flash | Kimi K2.5 Instant |
|---|---|---|
| LMArena Vision | 1253 | 1254 |
| GeoBench | 76% | — |
| VPCT | 46.2% | — |
| SpatialViz-Bench | 36.9% | — |
Multilingual Too close to call
Gemini 2.5 Flash: 52.3 (#88), Kimi K2.5 Instant: 52.0 (#94)
| Benchmark | Gemini 2.5 Flash | Kimi K2.5 Instant |
|---|---|---|
| LMArena Non-English | 1409 | 1406 |
| LMArena Chinese | 1450 | 1449 |
| LMArena French | 1433 | 1403 |
| LMArena German | 1418 | 1413 |
| LMArena Korean | 1385 | 1378 |
| LMArena Russian | 1415 | 1404 |
| LMArena Spanish | 1421 | 1447 |
| LMArena Japanese | 1405 | — |
Instruction Following Too close to call
Gemini 2.5 Flash: 75.7 (#54), Kimi K2.5 Instant: 75.3 (#65)
| Benchmark | Gemini 2.5 Flash | Kimi K2.5 Instant |
|---|---|---|
| LMArena Instruction Following | 1405 | 1430 |
| IFEval | 89.8% | — |
Long Context Gemini 2.5 Flash leads
Gemini 2.5 Flash: 47.5 (#17), Kimi K2.5 Instant: 43.9 (#83)
| Benchmark | Gemini 2.5 Flash | Kimi K2.5 Instant |
|---|---|---|
| LMArena Longer Query | 1419 | 1435 |
| Fiction.LiveBench | 77.8% | — |
Writing & Preference Kimi K2.5 Instant leads
Gemini 2.5 Flash: 53.8 (#157), Kimi K2.5 Instant: 60.6 (#95)
| Benchmark | Gemini 2.5 Flash | Kimi K2.5 Instant |
|---|---|---|
| LMArena Text | 1417 | 1420 |
| LMArena Creative Writing | 1400 | 1381 |
| LMArena Multi-Turn | 1408 | 1427 |
| Short-Story Creative Writing | 76.5% | — |
| EQ-Bench Creative Writing | 1137 | — |
| WildBench | 81.7% | — |
Frequently asked questions
Is Gemini 2.5 Flash better than Kimi K2.5 Instant?
Kimi K2.5 Instant is the stronger model overall, scoring 43.6 to 39.3 on the Noometry Index.
Is Gemini 2.5 Flash or Kimi K2.5 Instant better for coding?
Kimi K2.5 Instant scores higher on coding benchmarks: 42.6 versus 35.8 in the Noometry coding category.
How many benchmarks do Gemini 2.5 Flash and Kimi K2.5 Instant share?
17 benchmarks have published results for both models. Gemini 2.5 Flash has 54 scored results on Noometry and Kimi K2.5 Instant has 18.