# Kimi K2.5 vs Spark-X2.6-4B

> Side-by-side benchmark comparison for Kimi K2.5 and Spark-X2.6-4B across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/kimi-k2-5-vs-spark-x2-6-4b
- Last updated: October 20, 2026

- Shared sourced benchmarks: 15
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Kimi K2.5 leads by point estimate. Conditional score ranges do not establish rank confidence. Choose using the category evidence and your own workload tests.

## Summary

- Kimi K2.5 has the higher overall point estimate 53.03 to 40.14. Conditional score ranges do not establish rank confidence.
- The clearest category separation is in reasoning, where the averages are 71.3 for Kimi K2.5 and 48.8 for Spark-X2.6-4B.
- The biggest single benchmark swing is MCP Atlas in Agentic, with scores of 29.5% and 62.4%.
- Spark-X2.6-4B is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.
- Spark-X2.6-4B also has the larger context window at 1M.

## Model Snapshot

| Property | Kimi K2.5 | Spark-X2.6-4B |
|----------|----------|----------|
| Creator | Moonshot AI | SparkLLM |
| Type | Open Weight | Open Weight |
| Reasoning | Non-Reasoning | Reasoning |
| Context | 256K | 1M |
| Overall Score | 53.03 | 40.14 |
| Benchmarks Covered | 68 | 20 |
| Pricing (input/output) | $0.60 / $3.00 | $0.00 / $0.00 |

## Category Breakdown

### Agentic

- Winner: Directional only
- Kimi K2.5 public-lane score: 40.9 (Estimated · #67/131)
- Spark-X2.6-4B public-lane score: 33 (Estimated · #89/131)

| Benchmark | Kimi K2.5 | Spark-X2.6-4B | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.0 | 50.8% | Coming soon | Coming soon |
| BrowseComp | 60.6% | 53.1% | Kimi K2.5 |
| OSWorld-Verified | 63.3% | Coming soon | Coming soon |
| Claw-Eval | 52.3% | 69.9% | Spark-X2.6-4B |
| QwenClawBench | 54.3% | Coming soon | Coming soon |
| τ³-bench results | 65.7% | 34.7% | Kimi K2.5 |
| 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% | 62.4% | Spark-X2.6-4B |
| MCP-Tasks | 59.1% | Coming soon | Coming soon |
| WideResearch | 72.7% | Coming soon | Coming soon |
| BFCL v4 | 68.3% | 71.8% | Spark-X2.6-4B |
| Gert Labs | 45.88% | Coming soon | Coming soon |
| ResearchClawBench | 14.0% | Coming soon | Coming soon |
| JobBench | 8.7% | Coming soon | Coming soon |
| τ²-bench results | Coming soon | 86.9% | Coming soon |
| HLE w/ tools | Coming soon | 36.9% | Coming soon |

### Coding

- Winner: Directional only
- Kimi K2.5 public-lane score: 38.5 (Estimated · #69/152)
- Spark-X2.6-4B public-lane score: 30.6 (Estimated · #95/152)

| Benchmark | Kimi K2.5 | Spark-X2.6-4B | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 76.8% | 62.8% | Kimi K2.5 |
| SWE-bench Verified* | 70.8% | Coming soon | Coming soon |
| LiveCodeBench v6 | 85.0% | Coming soon | Coming soon |
| SWE-bench Pro | 50.7% | 54.3% | Spark-X2.6-4B |
| SWE Multilingual | 73% | 64.7% | Kimi K2.5 |
| SWE-Rebench | 58.5% | Coming soon | Coming soon |
| React Native Evals | 77.2% | Coming soon | Coming soon |
| NL2Repo | 32% | Coming soon | Coming soon |
| SciCode | 48.7% | 36.8% | Kimi K2.5 |
| Terminal-Bench 2.0 | 50.8% | Coming soon | Coming soon |

### Reasoning

- Winner: Not comparable
- Kimi K2.5 public-lane score: 71.3 (Unranked · 3 rankable rows)
- Spark-X2.6-4B public-lane score: 48.8 (Unranked · 2 rankable rows)

| Benchmark | Kimi K2.5 | Spark-X2.6-4B | Winner |
|-----------|-----------|-----------|--------|
| LongBench v2 | 61% | 53.3% | Kimi K2.5 |

### Multimodal & Grounded

- Winner: Not comparable
- Kimi K2.5 public-lane score: 70.4 (#33/55)
- Spark-X2.6-4B public-lane score: Coming soon

| Benchmark | Kimi K2.5 | Spark-X2.6-4B | Winner |
|-----------|-----------|-----------|--------|
| MMMU | 84.3% | Coming soon | Coming soon |
| MMMU-Pro | 78.5% | Coming soon | Coming soon |
| RealWorldQA | 81.0% | Coming soon | Coming soon |
| OmniDocBench 1.5 | 88.8% | Coming soon | Coming soon |
| Video-MME | 87.4% | Coming soon | Coming soon |
| Video-MME (with subtitle) | 87.4% | Coming soon | Coming soon |
| Video-MME (w/o subtitle) | 83.2% | Coming soon | Coming soon |
| MathVision | 84.2% | Coming soon | Coming soon |
| We-Math | 84.7% | Coming soon | Coming soon |
| DynaMath | 84.4% | Coming soon | Coming soon |
| SimpleVQA | 71.2% | Coming soon | Coming soon |
| MMLongBench-Doc | 58.5% | Coming soon | Coming soon |
| CC-OCR | 79.7% | Coming soon | Coming soon |
| AI2D_TEST | 90.8% | Coming soon | Coming soon |
| CountBench | 94.1% | Coming soon | Coming soon |
| RefCOCO (avg) | 87.8% | Coming soon | Coming soon |
| MMVU | 80.4% | Coming soon | Coming soon |
| VideoMMMU | 86.6% | Coming soon | Coming soon |
| MLVU (M-Avg) | 85.0% | Coming soon | Coming soon |
| CharXiv | 77.5% | Coming soon | Coming soon |

### Knowledge

- Winner: Directional only
- Kimi K2.5 public-lane score: 51.4 (Estimated · #78/187)
- Spark-X2.6-4B public-lane score: 43 (Estimated · #109/187)

| Benchmark | Kimi K2.5 | Spark-X2.6-4B | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 87.6% | 69.9% | Kimi K2.5 |
| GPQA-D | 87.6% | 77.1% | Kimi K2.5 |
| SuperGPQA | 69.2% | Coming soon | Coming soon |
| MMLU-Pro | 87.1% | Coming soon | Coming soon |
| MMLU-Pro (Arcee) | 87.1% | Coming soon | Coming soon |
| MMLU-Redux | 94.5% | Coming soon | Coming soon |
| C-Eval | 94% | Coming soon | Coming soon |
| HLE | 30.1% | Coming soon | Coming soon |
| HLE w/o tools | Coming soon | 17.9% | Coming soon |

### Multilingual

- Winner: Not comparable
- Kimi K2.5 public-lane score: 87.3 (#8/17)
- Spark-X2.6-4B public-lane score: Coming soon

| Benchmark | Kimi K2.5 | Spark-X2.6-4B | Winner |
|-----------|-----------|-----------|--------|
| MMLU-ProX | 82.3% | Coming soon | Coming soon |
| NOVA-63 | 56.0% | Coming soon | Coming soon |
| INCLUDE | 83.3% | Coming soon | Coming soon |
| PolyMath | 43.1% | Coming soon | Coming soon |
| MAXIFE | 72.8% | Coming soon | Coming soon |

### Instruction Following

- Winner: Directional only
- Kimi K2.5 public-lane score: 85.8 (#48/149)
- Spark-X2.6-4B public-lane score: 78.2 (#62/149)

| Benchmark | Kimi K2.5 | Spark-X2.6-4B | Winner |
|-----------|-----------|-----------|--------|
| IFEval | 93.9% | 93.6% | Kimi K2.5 |
| IFBench | Coming soon | 75.8% | Coming soon |

### Mathematics

- Winner: Not comparable
- Kimi K2.5 public-lane score: 83.3 (Unranked · 7 rankable rows)
- Spark-X2.6-4B public-lane score: 76.4 (Unranked · 3 rankable rows)

| Benchmark | Kimi K2.5 | Spark-X2.6-4B | Winner |
|-----------|-----------|-----------|--------|
| AIME 2025 | 96.1% | Coming soon | Coming soon |
| AIME26 | 95.8% | 91.2% | Kimi K2.5 |
| 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% | 81.3% | Kimi K2.5 |
| MMAnswerBench | 81.8% | Coming soon | Coming soon |
| IMOAnswerBench | Coming soon | 75.2% | Coming soon |

## FAQ

### Which is better overall, Kimi K2.5 or Spark-X2.6-4B?

Kimi K2.5 has the higher overall point estimate. Conditional score ranges do not establish rank confidence.

### Where is the biggest gap between Kimi K2.5 and Spark-X2.6-4B?

The widest category gap is in reasoning, where the averages are 71.3 for Kimi K2.5 and 48.8 for Spark-X2.6-4B.

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

Kimi K2.5 currently has 68 sourced benchmark scores on BenchLM.

### How many benchmarks does Spark-X2.6-4B cover on BenchLM?

Spark-X2.6-4B currently has 20 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Kimi K2.5 vs Kimi K2.5 (Reasoning)](/compare/kimi-k2-5-vs-kimi-k2-5-reasoning)
- [Spark-X2.6-4B vs Kimi K2.5 (Reasoning)](/compare/kimi-k2-5-reasoning-vs-spark-x2-6-4b)
- [Kimi K2.5 vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-kimi-k2-5)
- [Spark-X2.6-4B vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-spark-x2-6-4b)

## Explore More

- [Kimi K2.5 profile](/models/kimi-k2-5)
- [Spark-X2.6-4B profile](/models/spark-x2-6-4b)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)