# GPT-5.5 vs Kimi K2.6

> Side-by-side benchmark comparison for GPT-5.5 and Kimi K2.6 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gpt-5-5-vs-kimi-2-6
- Last updated: September 14, 2026

- Shared sourced benchmarks: 24
- HTML indexing: indexable
- Ranking lane: BenchAlign v5

## Quick Verdict

Pick GPT-5.5 if you want the stronger benchmark profile. Kimi K2.6 only makes more sense when its price, context window, or workload-specific category wins matter more than the overall score.

## Summary

- GPT-5.5 leads overall 72.14 to 65.46.
- The clearest category separation is in coding, where the averages are 67.6 for GPT-5.5 and 50.8 for Kimi K2.6.
- The biggest single benchmark swing is Vibe Code Bench in Coding, with scores of 69.85% and 37.89%.
- Kimi K2.6 is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.
- GPT-5.5 also has the larger context window at 1M.

## Model Snapshot

| Property | GPT-5.5 | Kimi K2.6 |
|----------|----------|----------|
| Creator | OpenAI | Moonshot AI |
| Type | Proprietary | Open Weight |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | 256K |
| Overall Score | 72.14 | 65.46 |
| Benchmarks Covered | 39 | 37 |
| Pricing (input/output) | $5.00 / $30.00 | $0.95 / $4.00 |

## Category Breakdown

### Agentic

- Winner: GPT-5.5
- GPT-5.5 public-lane score: 61.1 (Supported · #17/153)
- Kimi K2.6 public-lane score: 46.6 (Supported · #77/153)

| Benchmark | GPT-5.5 | Kimi K2.6 | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.0 | 82% | 66.7% | GPT-5.5 |
| CyberGym | 81.8% | Coming soon | Coming soon |
| BrowseComp | 84.4% | 83.2% | GPT-5.5 |
| OSWorld-Verified | 78.7% | 73.1% | GPT-5.5 |
| MCP Atlas | 75.3% | 55.9% | GPT-5.5 |
| Toolathlon | 55.6% | 50% | GPT-5.5 |
| τ²-bench results | 98% | Coming soon | Coming soon |
| Gert Labs | 72.93% | 56.82% | GPT-5.5 |
| ResearchClawBench | 17.0% | 18.0% | Kimi K2.6 |
| OSWorld 2.0 | 13.0% | 4.6% | GPT-5.5 |
| JobBench | 42.7% | Coming soon | Coming soon |
| ExploitGym | 13.4% | Coming soon | Coming soon |
| Terminal-Bench 2.1 (Vals) | 76.4% | 53.6% | GPT-5.5 |
| ApprenticeBench | 20% | Coming soon | Coming soon |
| Claw-Eval | Coming soon | 62.3% | Coming soon |
| DeepSearchQA | Coming soon | 92.5% | Coming soon |
| WideResearch | Coming soon | 80.8% | Coming soon |

### Coding

- Winner: GPT-5.5
- GPT-5.5 public-lane score: 67.6 (Supported · #7/152)
- Kimi K2.6 public-lane score: 50.8 (Supported · #53/152)

| Benchmark | GPT-5.5 | Kimi K2.6 | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Pro | 58.6% | 58.6% | Tie |
| Terminal-Bench 2.0 | 82.0% | 66.7% | GPT-5.5 |
| Vibe Code Bench | 69.85% | 37.89% | GPT-5.5 |
| React Native Evals | 84.7% | Coming soon | Coming soon |
| cursorBench31 | 59.2% | 47.6% | GPT-5.5 |
| cursorBench32 | 58.4% | Coming soon | Coming soon |
| FrontierCode 1.1 Main | 43.0% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | 85.3% | 86.8% | Kimi K2.6 |
| SWE-bench (Vals) | 82.6% | 76.2% | GPT-5.5 |
| SWE-bench Verified | Coming soon | 80.2% | Coming soon |
| LiveCodeBench v6 | Coming soon | 89.6% | Coming soon |
| SWE Multilingual | Coming soon | 76.7% | Coming soon |
| SciCode | Coming soon | 52.2% | Coming soon |

### Multimodal & Grounded

- Winner: Coming soon
- GPT-5.5 public-lane score: 71.3 (#19/48)
- Kimi K2.6 public-lane score: 64 (#26/48)

| Benchmark | GPT-5.5 | Kimi K2.6 | Winner |
|-----------|-----------|-----------|--------|
| MMMU-Pro | 81.2% | 79.4% | GPT-5.5 |
| MMMU-Pro w/ Python | 83.2% | 80.1% | GPT-5.5 |
| OfficeQA Pro | 54.1% | Coming soon | Coming soon |
| CharXiv | Coming soon | 80.4% | Coming soon |
| MathVision | Coming soon | 87.4% | Coming soon |
| V* | Coming soon | 96.9% | Coming soon |

### Reasoning

- Winner: Coming soon
- GPT-5.5 public-lane score: 64 (#13/20)
- Kimi K2.6 public-lane score: Coming soon

| Benchmark | GPT-5.5 | Kimi K2.6 | Winner |
|-----------|-----------|-----------|--------|
| MRCR v2 64K-128K | 83.1% | Coming soon | Coming soon |
| MRCR v2 128K-256K | 87.5% | Coming soon | Coming soon |
| ARC-AGI-2 | 85% | Coming soon | Coming soon |
| ARC-AGI-3 | 0.4% | Coming soon | Coming soon |

### Knowledge

- Winner: GPT-5.5
- GPT-5.5 public-lane score: 72.9 (Supported · #7/183)
- Kimi K2.6 public-lane score: 61.4 (Supported · #32/183)

| Benchmark | GPT-5.5 | Kimi K2.6 | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 93.6% | 90.5% | GPT-5.5 |
| GPQA-D | 93.6% | 90.5% | GPT-5.5 |
| HLE | 52.2% | 34.7% | GPT-5.5 |
| HLE w/o tools | 41.4% | Coming soon | Coming soon |
| GPQA Diamond (Vals) | 93.2% | 89.1% | GPT-5.5 |
| MMLU-Pro (Vals) | 88.1% | 87.6% | GPT-5.5 |

### Instruction Following

- Winner: Coming soon
- GPT-5.5 public-lane score: 93.2 (#7/123)
- Kimi K2.6 public-lane score: Coming soon

### Mathematics

- Winner: Coming soon
- GPT-5.5 public-lane score: 69.6 (Unranked · 3 rankable rows)
- Kimi K2.6 public-lane score: 71.3 (#1/7)

| Benchmark | GPT-5.5 | Kimi K2.6 | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath (legacy) | 51.7% | Coming soon | Coming soon |
| FrontierMath v2 (Tiers 1-3) | 51.700% | 38.966% | GPT-5.5 |
| FrontierMath v2 (Tier 4) | 35.400% | 14.580% | GPT-5.5 |
| AIME26 | Coming soon | 96.4% | Coming soon |
| HMMT Feb 2026 | Coming soon | 92.7% | Coming soon |
| MMAnswerBench | Coming soon | 86.0% | Coming soon |

## FAQ

### Which is better overall, GPT-5.5 or Kimi K2.6?

GPT-5.5 is ahead overall on BenchLM right now.

### Where is the biggest gap between GPT-5.5 and Kimi K2.6?

The widest category gap is in coding, where the averages are 67.6 for GPT-5.5 and 50.8 for Kimi K2.6.

### How many benchmarks does GPT-5.5 cover on BenchLM?

GPT-5.5 currently has 39 sourced benchmark scores on BenchLM.

### How many benchmarks does Kimi K2.6 cover on BenchLM?

Kimi K2.6 currently has 37 sourced benchmark scores on BenchLM.

## Related Comparisons

- [GPT-5.5 vs GPT-5.5 Pro](/compare/gpt-5-5-vs-gpt-5-5-pro)
- [Kimi K2.6 vs GPT-5.5 Pro](/compare/gpt-5-5-pro-vs-kimi-2-6)
- [GPT-5.5 vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-gpt-5-5)
- [Kimi K2.6 vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-kimi-2-6)

## Explore More

- [GPT-5.5 profile](/models/gpt-5-5)
- [Kimi K2.6 profile](/models/kimi-2-6)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)