Model comparison
Kimi K2.7 Code vs Step 5 Preview
Kimi K2.7 Code and Step 5 Preview score almost the same on the Noometry Index (43.0 vs 43.8), so choose on price, context window or the category you care about most.
Last verified . 3 shared benchmarks.
StepFunSummary
- They share 3 benchmarks with published results for both. Kimi K2.7 Code scores higher in 1 category and Step 5 Preview in 1 category; one gap is clear of the uncertainty.
- The widest gap is in coding, where Step 5 Preview leads 50.6 to 42.4.
- The biggest single-benchmark swing is SciCode: 47.5% for Kimi K2.7 Code and 58.9% for Step 5 Preview.
- Step 5 Preview is cheaper at $1 / $2.70 per million input/output tokens, against $0.95 / $4 for Kimi K2.7 Code.
- Step 5 Preview accepts more context: 1.02M tokens versus 262K.
- Kimi K2.7 Code has downloadable open weights; the other is API-only.
Side by side
| Kimi K2.7 Code | Step 5 Preview | |
|---|---|---|
| Provider | Moonshot AI | StepFun |
| Noometry Index | 43.0 | 43.8 |
| Released | 2026-06-12 | 2026-09-16 |
| Weights | Open | Proprietary |
| Context window | 262K | 1.02M |
| Max output | 262K | 66K |
| Input $ / M tokens | $0.95 | $1 |
| Output $ / M tokens | $4 | $2.70 |
| Results tracked | 19 | 3 |
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Category by category
Coding Step 5 Preview leads
Kimi K2.7 Code: 42.4 (#92), Step 5 Preview: 50.6 (#40)
| Benchmark | Kimi K2.7 Code | Step 5 Preview |
|---|---|---|
| LMArena WebDev | 1473 | 1569 |
| SciCode | 47.5% | 58.9% |
| DeepSWE | 30.5% | — |
| FrontierCode | 30.1% | — |
| WeirdML | 54.1% | — |
| ALE-Bench | 886.23 | — |
Agentic & Tool Use Not comparable
Kimi K2.7 Code: 23.9 (#115), Step 5 Preview: —
| Benchmark | Kimi K2.7 Code | Step 5 Preview |
|---|---|---|
| APEX-Agents | 37.6% | — |
| GBAEval | 0.9% | — |
| Vending-Bench 2 | 5,083 | — |
Reasoning Too close to call
Kimi K2.7 Code: 38.2 (#56), Step 5 Preview: 38.0 (#58)
| Benchmark | Kimi K2.7 Code | Step 5 Preview |
|---|---|---|
| CritPt | 10% | 20.9% |
| SimpleBench | 57.9% | — |
| Chess Puzzles | 21% | — |
| Surface Evolver Bench | 48.8% | — |
| Epoch Capabilities Index | 150.01 | — |
Math Not comparable
Kimi K2.7 Code: 52.6 (#39), Step 5 Preview: —
| Benchmark | Kimi K2.7 Code | Step 5 Preview |
|---|---|---|
| FrontierMath (Tiers 1-3) | 54% | — |
| FrontierMath Tier 4 | 12.2% | — |
| OTIS Mock AIME 2024-2025 | 95.6% | — |
Knowledge Not comparable
Kimi K2.7 Code: 53.6 (#51), Step 5 Preview: —
| Benchmark | Kimi K2.7 Code | Step 5 Preview |
|---|---|---|
| GPQA Diamond | 87.9% | — |
| SimpleQA Verified | 36.5% | — |
Frequently asked questions
Is Kimi K2.7 Code better than Step 5 Preview?
Kimi K2.7 Code and Step 5 Preview score almost the same on the Noometry Index (43.0 vs 43.8), so choose on price, context window or the category you care about most.
Which is cheaper, Kimi K2.7 Code or Step 5 Preview?
Step 5 Preview is cheaper. It lists at $1 per million input tokens and $2.70 per million output tokens; Kimi K2.7 Code lists at $0.95 and $4.
Is Kimi K2.7 Code or Step 5 Preview better for coding?
Step 5 Preview scores higher on coding benchmarks: 50.6 versus 42.4 in the Noometry coding category.
Which has the bigger context window?
Step 5 Preview does, with 1.02M tokens against 262K.
How many benchmarks do Kimi K2.7 Code and Step 5 Preview share?
3 benchmarks have published results for both models. Kimi K2.7 Code has 19 scored results on Noometry and Step 5 Preview has 3.