# Kimi K2.5 vs Step 5 Preview

> Side-by-side benchmark comparison for Kimi K2.5 and Step 5 Preview across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/kimi-k2-5-vs-step-5-preview
- Last updated: September 21, 2026

- Shared sourced benchmarks: 7
- HTML indexing: indexable
- Ranking lane: BenchAlign v5

## Quick Verdict

Pick Step 5 Preview if you want the stronger benchmark profile. Kimi K2.5 only makes more sense when its price, context window, or workload-specific category wins matter more than the overall score.

## Summary

- Step 5 Preview leads overall 72 to 54.3.
- The clearest category separation is in reasoning, where the averages are 54.1 for Kimi K2.5 and 78.5 for Step 5 Preview.
- The biggest single benchmark swing is MCP Atlas in Agentic, with scores of 29.5% and 85.6%.
- Step 5 Preview is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.
- Step 5 Preview also has the larger context window at 1M.

## Model Snapshot

| Property | Kimi K2.5 | Step 5 Preview |
|----------|----------|----------|
| Creator | Moonshot AI | StepFun |
| Type | Open Weight | Pending |
| Reasoning | Non-Reasoning | Reasoning |
| Context | 256K | 1M |
| Overall Score | 54.3 | null |
| Benchmarks Covered | 45 | 22 |
| Pricing (input/output) | $0.60 / $3.00 | $1.00 / $2.70 |

## Category Breakdown

### Agentic

- Winner: Coming soon
- Kimi K2.5 public-lane score: 47.4 (Estimated · #75/154)
- Step 5 Preview public-lane score: Coming soon

| Benchmark | Kimi K2.5 | Step 5 Preview | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.0 | 50.8% | Coming soon | Coming soon |
| BrowseComp | 60.6% | 88.7% | Step 5 Preview |
| Claw-Eval | 52.3% | Coming soon | Coming soon |
| QwenClawBench | 54.3% | Coming soon | Coming soon |
| τ³-bench results | 65.7% | Coming soon | Coming soon |
| DeepSearchQA | 77.1% | Coming soon | Coming soon |
| DeepPlanning | 14.4% | Coming soon | Coming soon |
| Toolathlon | 27.8% | Coming soon | Coming soon |
| MCP Atlas | 29.5% | 85.6% | Step 5 Preview |
| MCP-Tasks | 59.1% | Coming soon | Coming soon |
| WideResearch | 72.7% | Coming soon | Coming soon |
| Gert Labs | 45.88% | Coming soon | Coming soon |
| ResearchClawBench | 14.0% | Coming soon | Coming soon |
| JobBench | 8.7% | 59.0% | Step 5 Preview |
| Terminal-Bench 2.1 | Coming soon | 85.0% | Coming soon |
| Terminal-Bench 4.0 | Coming soon | 33.30% | Coming soon |
| CyberGym | Coming soon | 84.7% | Coming soon |
| AutomationBench | Coming soon | 44.0% | Coming soon |
| Toolathlon-Verified | Coming soon | 74.1% | Coming soon |
| APEX-Agents | Coming soon | 37.8% | Coming soon |
| DRACO | Coming soon | 83.3% | Coming soon |
| Agents' Last Exam | Coming soon | 29.5% | Coming soon |

### Coding

- Winner: Coming soon
- Kimi K2.5 public-lane score: 51.3 (Estimated · #56/156)
- Step 5 Preview public-lane score: Coming soon

| Benchmark | Kimi K2.5 | Step 5 Preview | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 76.8% | Coming soon | Coming soon |
| SWE-bench Verified* | 70.8% | Coming soon | Coming soon |
| LiveCodeBench v6 | 85.0% | Coming soon | Coming soon |
| SWE-bench Pro | 50.7% | Coming soon | Coming soon |
| SWE Multilingual | 73% | Coming soon | Coming soon |
| SWE-Rebench | 58.5% | Coming soon | Coming soon |
| React Native Evals | 77.2% | Coming soon | Coming soon |
| SciCode | 48.7% | 58.9% | Step 5 Preview |
| DeepSWE | Coming soon | 67.7% | Coming soon |
| Terminal-Bench 2.1 | Coming soon | 85.0% | Coming soon |
| ProgramBench | Coming soon | 80.5% | Coming soon |
| sweMarathon | Coming soon | 72.7% | Coming soon |
| MLS-Bench Lite | Coming soon | 40.5% | Coming soon |

### Reasoning

- Winner: Coming soon
- Kimi K2.5 public-lane score: 54.1 (Unranked · 3 rankable rows)
- Step 5 Preview public-lane score: 78.5 (Unranked · 2 rankable rows)

| Benchmark | Kimi K2.5 | Step 5 Preview | Winner |
|-----------|-----------|-----------|--------|
| LongBench v2 | 61% | Coming soon | Coming soon |
| CritPt | Coming soon | 20.9% | Coming soon |

### Multimodal & Grounded

- Winner: Coming soon
- Kimi K2.5 public-lane score: 65.8 (#24/49)
- Step 5 Preview public-lane score: 61.2 (#28/49)

| Benchmark | Kimi K2.5 | Step 5 Preview | Winner |
|-----------|-----------|-----------|--------|
| MMMU-Pro | 78.5% | 76% | Kimi K2.5 |
| Video-MME | 87.4% | Coming soon | Coming soon |
| MMVU | 80.4% | Coming soon | Coming soon |
| VideoMMMU | 86.6% | Coming soon | Coming soon |
| OfficeQA Pro | Coming soon | 60.3% | Coming soon |

### Knowledge

- Winner: Coming soon
- Kimi K2.5 public-lane score: 52.3 (Estimated · #68/186)
- Step 5 Preview public-lane score: Coming soon

| Benchmark | Kimi K2.5 | Step 5 Preview | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 87.6% | Coming soon | Coming soon |
| GPQA-D | 87.6% | 93.5% | Step 5 Preview |
| SuperGPQA | 69.2% | Coming soon | Coming soon |
| MMLU-Pro | 87.1% | Coming soon | Coming soon |
| MMLU-Pro (Arcee) | 87.1% | Coming soon | Coming soon |
| HLE | 30.1% | 46.5% | Step 5 Preview |

### Multilingual

- Winner: Coming soon
- Kimi K2.5 public-lane score: 38.2 (#8/12)
- Step 5 Preview public-lane score: Coming soon

| Benchmark | Kimi K2.5 | Step 5 Preview | Winner |
|-----------|-----------|-----------|--------|
| MMLU-ProX | 82.3% | Coming soon | Coming soon |
| NOVA-63 | 56.0% | Coming soon | Coming soon |

### Instruction Following

- Winner: Coming soon
- Kimi K2.5 public-lane score: 84.4 (#41/124)
- Step 5 Preview public-lane score: Coming soon

| Benchmark | Kimi K2.5 | Step 5 Preview | Winner |
|-----------|-----------|-----------|--------|
| IFEval | 93.9% | Coming soon | Coming soon |

### Mathematics

- Winner: Coming soon
- Kimi K2.5 public-lane score: 62.1 (#4/7)
- Step 5 Preview public-lane score: Coming soon

| Benchmark | Kimi K2.5 | Step 5 Preview | Winner |
|-----------|-----------|-----------|--------|
| AIME 2025 | 96.1% | Coming soon | Coming soon |
| AIME26 | 95.8% | Coming soon | Coming soon |
| AIME25 (Arcee) | 96.3% | Coming soon | Coming soon |
| HMMT Feb 2025 | 95.4% | Coming soon | Coming soon |
| HMMT Nov 2025 | 91.1% | Coming soon | Coming soon |
| HMMT Feb 2026 | 87.1% | Coming soon | Coming soon |
| MMAnswerBench | 81.8% | Coming soon | Coming soon |
| FrontierMath v2 (Tiers 1-3) | 27.900% | Coming soon | Coming soon |
| FrontierMath v2 (Tier 4) | 4.200% | Coming soon | Coming soon |

## FAQ

### Which is better overall, Kimi K2.5 or Step 5 Preview?

Step 5 Preview is ahead overall on BenchLM right now.

### Where is the biggest gap between Kimi K2.5 and Step 5 Preview?

The widest category gap is in reasoning, where the averages are 54.1 for Kimi K2.5 and 78.5 for Step 5 Preview.

### How many benchmarks does Kimi K2.5 cover on BenchLM?

Kimi K2.5 currently has 45 sourced benchmark scores on BenchLM.

### How many benchmarks does Step 5 Preview cover on BenchLM?

Step 5 Preview currently has 22 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Kimi K2.5 vs Kimi K2.5 (Reasoning)](/compare/kimi-k2-5-vs-kimi-k2-5-reasoning)
- [Step 5 Preview vs Kimi K2.5 (Reasoning)](/compare/kimi-k2-5-reasoning-vs-step-5-preview)
- [Kimi K2.5 vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-kimi-k2-5)
- [Step 5 Preview vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-step-5-preview)

## Explore More

- [Kimi K2.5 profile](/models/kimi-k2-5)
- [Step 5 Preview profile](/models/step-5-preview)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)