Model comparison
Kimi K2 Thinking Turbo vs Step 5 Preview
Kimi K2 Thinking Turbo is the stronger model overall, scoring 45.4 to 43.8 on the Noometry Index.
Last verified . 1 shared benchmarks.
StepFunSummary
- They share 1 benchmark with published results for both. Kimi K2 Thinking Turbo scores higher in 0 categories and Step 5 Preview in 2 categories; 2 gaps are clear of the uncertainty.
- The widest gap is in coding, where Step 5 Preview leads 50.6 to 38.1.
- Kimi K2 Thinking Turbo has downloadable open weights; the other is API-only.
Side by side
| Kimi K2 Thinking Turbo | Step 5 Preview | |
|---|---|---|
| Provider | Moonshot AI | StepFun |
| Noometry Index | 45.4 | 43.8 |
| Released | 2025-11-06 | 2026-09-16 |
| Weights | Open | Proprietary |
| Context window | — | 1.02M |
| Max output | — | 66K |
| Input $ / M tokens | — | $1 |
| Output $ / M tokens | — | $2.70 |
| Results tracked | 21 | 3 |
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Category by category
Coding Step 5 Preview leads
Kimi K2 Thinking Turbo: 38.1 (#166), Step 5 Preview: 50.6 (#40)
| Benchmark | Kimi K2 Thinking Turbo | Step 5 Preview |
|---|---|---|
| LMArena WebDev | 1322 | 1569 |
| SciCode | — | 58.9% |
| LMArena Coding | 1454 | — |
Reasoning Step 5 Preview leads
Kimi K2 Thinking Turbo: 31.4 (#72), Step 5 Preview: 38.0 (#58)
| Benchmark | Kimi K2 Thinking Turbo | Step 5 Preview |
|---|---|---|
| CritPt | — | 20.9% |
| Chess Puzzles | 20% | — |
| LMArena Hard Prompts | 1428 | — |
Math Not comparable
Kimi K2 Thinking Turbo: 45.5 (#62), Step 5 Preview: —
| Benchmark | Kimi K2 Thinking Turbo | Step 5 Preview |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 83.1% | — |
| LMArena Math | 1429 | — |
Knowledge Not comparable
Kimi K2 Thinking Turbo: 50.9 (#64), Step 5 Preview: —
| Benchmark | Kimi K2 Thinking Turbo | Step 5 Preview |
|---|---|---|
| GPQA Diamond | 84.2% | — |
| LMArena Expert | 1439 | — |
Multilingual Not comparable
Kimi K2 Thinking Turbo: 51.6 (#104), Step 5 Preview: —
| Benchmark | Kimi K2 Thinking Turbo | Step 5 Preview |
|---|---|---|
| LMArena Non-English | 1398 | — |
| LMArena Chinese | 1457 | — |
| LMArena French | 1425 | — |
| LMArena German | 1390 | — |
| LMArena Japanese | 1356 | — |
| LMArena Korean | 1329 | — |
| LMArena Russian | 1390 | — |
| LMArena Spanish | 1407 | — |
Instruction Following Not comparable
Kimi K2 Thinking Turbo: 74.2 (#103), Step 5 Preview: —
| Benchmark | Kimi K2 Thinking Turbo | Step 5 Preview |
|---|---|---|
| LMArena Instruction Following | 1403 | — |
Long Context Not comparable
Kimi K2 Thinking Turbo: 43.2 (#99), Step 5 Preview: —
| Benchmark | Kimi K2 Thinking Turbo | Step 5 Preview |
|---|---|---|
| LMArena Longer Query | 1415 | — |
Writing & Preference Not comparable
Kimi K2 Thinking Turbo: 60.2 (#99), Step 5 Preview: —
| Benchmark | Kimi K2 Thinking Turbo | Step 5 Preview |
|---|---|---|
| LMArena Text | 1415 | — |
| LMArena Creative Writing | 1373 | — |
| LMArena Multi-Turn | 1414 | — |
Frequently asked questions
Is Kimi K2 Thinking Turbo better than Step 5 Preview?
Kimi K2 Thinking Turbo is the stronger model overall, scoring 45.4 to 43.8 on the Noometry Index.
Is Kimi K2 Thinking Turbo or Step 5 Preview better for coding?
Step 5 Preview scores higher on coding benchmarks: 50.6 versus 38.1 in the Noometry coding category.
How many benchmarks do Kimi K2 Thinking Turbo and Step 5 Preview share?
1 benchmark has published results for both models. Kimi K2 Thinking Turbo has 21 scored results on Noometry and Step 5 Preview has 3.