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

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

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

- Shared sourced benchmarks: 4
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Spark-X2.6-4B leads by point estimate. Conditional score ranges do not establish rank confidence. Choose using the category evidence and your own workload tests.

## Summary

- Spark-X2.6-4B has the higher overall point estimate 40.14 to 33.43. Conditional score ranges do not establish rank confidence.
- The clearest category separation is in mathematics, where the averages are 0 for Kimi K2 and 76.4 for Spark-X2.6-4B.
- The biggest single benchmark swing is SWE Multilingual in Coding, with scores of 47.3% and 64.7%.
- 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 | Spark-X2.6-4B |
|----------|----------|----------|
| Creator | Moonshot AI | SparkLLM |
| Type | Proprietary | Open Weight |
| Reasoning | Non-Reasoning | Reasoning |
| Context | 128K | 1M |
| Overall Score | 33.43 | 40.14 |
| Benchmarks Covered | 13 | 20 |
| Pricing (input/output) | $0.60 / $2.50 | $0.00 / $0.00 |

## Category Breakdown

### Agentic

- Winner: Not comparable
- Kimi K2 public-lane score: Coming soon
- Spark-X2.6-4B public-lane score: 33 (Estimated · #89/131)

| Benchmark | Kimi K2 | Spark-X2.6-4B | Winner |
|-----------|-----------|-----------|--------|
| BFCL v4 | Coming soon | 71.8% | Coming soon |
| τ²-bench results | Coming soon | 86.9% | Coming soon |
| MCP Atlas | Coming soon | 62.4% | Coming soon |
| BrowseComp | Coming soon | 53.1% | Coming soon |
| HLE w/ tools | Coming soon | 36.9% | Coming soon |
| τ³-bench results | Coming soon | 34.7% | Coming soon |
| Claw-Eval | Coming soon | 69.9% | Coming soon |

### Coding

- Winner: Not comparable
- Kimi K2 public-lane score: Coming soon
- Spark-X2.6-4B public-lane score: 30.6 (Estimated · #95/152)

| Benchmark | Kimi K2 | Spark-X2.6-4B | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 65.8% | 62.8% | Kimi K2 |
| LiveCodeBench v6 | 53.7% | Coming soon | Coming soon |
| SWE Multilingual | 47.3% | 64.7% | Spark-X2.6-4B |
| SWE-bench Pro | Coming soon | 54.3% | Coming soon |
| SciCode | Coming soon | 36.8% | Coming soon |

### Reasoning

- Winner: Not comparable
- Kimi K2 public-lane score: 61.4 (Unranked · 2 rankable rows)
- Spark-X2.6-4B public-lane score: 48.8 (Unranked · 2 rankable rows)

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

### Knowledge

- Winner: Directional only
- Kimi K2 public-lane score: 36 (Estimated · #132/187)
- Spark-X2.6-4B public-lane score: 43 (Estimated · #109/187)

| Benchmark | Kimi K2 | Spark-X2.6-4B | Winner |
|-----------|-----------|-----------|--------|
| MMLU | 89.5% | Coming soon | Coming soon |
| GPQA | 75.1% | 69.9% | Kimi K2 |
| SuperGPQA | 57.2% | Coming soon | Coming soon |
| MMLU-Pro | 81.1% | Coming soon | Coming soon |
| SimpleQA | 31% | Coming soon | Coming soon |
| HLE | 4.7% | Coming soon | Coming soon |
| GPQA-D | Coming soon | 77.1% | Coming soon |
| HLE w/o tools | Coming soon | 17.9% | Coming soon |

### Instruction Following

- Winner: Directional only
- Kimi K2 public-lane score: 48.4 (#97/149)
- Spark-X2.6-4B public-lane score: 78.2 (#62/149)

| Benchmark | Kimi K2 | Spark-X2.6-4B | Winner |
|-----------|-----------|-----------|--------|
| IFEval | 89.8% | 93.6% | Spark-X2.6-4B |
| IFBench | Coming soon | 75.8% | Coming soon |

### Mathematics

- Winner: Not comparable
- Kimi K2 public-lane score: 0 (#12/12)
- Spark-X2.6-4B public-lane score: 76.4 (Unranked · 3 rankable rows)

| Benchmark | Kimi K2 | Spark-X2.6-4B | Winner |
|-----------|-----------|-----------|--------|
| AIME 2024 | 69.6% | Coming soon | Coming soon |
| AIME 2025 | 49.5% | Coming soon | Coming soon |
| MATH-500 | 97.4% | Coming soon | Coming soon |
| AIME26 | Coming soon | 91.2% | Coming soon |
| HMMT Feb 2026 | Coming soon | 81.3% | Coming soon |
| IMOAnswerBench | Coming soon | 75.2% | Coming soon |

## FAQ

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

Spark-X2.6-4B has the higher overall point estimate. Conditional score ranges do not establish rank confidence.

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

The widest category gap is in mathematics, where the averages are 0 for Kimi K2 and 76.4 for Spark-X2.6-4B.

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

Kimi K2 currently has 13 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 vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-kimi-k2)
- [Spark-X2.6-4B vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-spark-x2-6-4b)
- [Kimi K2 vs GPT-6.1 Sol](/compare/gpt-6-1-sol-vs-kimi-k2)
- [Spark-X2.6-4B vs GPT-6.1 Sol](/compare/gpt-6-1-sol-vs-spark-x2-6-4b)

## Explore More

- [Kimi K2 profile](/models/kimi-k2)
- [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)