# GPT-5.5 Pro vs Kimi K2.6

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

- Canonical page: https://benchlm.ai/compare/gpt-5-5-pro-vs-kimi-2-6
- Last updated: September 4, 2026

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

## Quick Verdict

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

## Summary

- Kimi K2.6 leads overall 65.3 to 63.07.
- The clearest category separation is in agentic, where the averages are 60.6 for GPT-5.5 Pro and 46.1 for Kimi K2.6.
- The biggest single benchmark swing is FrontierMath v2 (Tier 4) in Mathematics, with scores of 39.600% and 14.580%.
- Kimi K2.6 is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.
- GPT-5.5 Pro also has the larger context window at 1M.

## Model Snapshot

| Property | GPT-5.5 Pro | Kimi K2.6 |
|----------|----------|----------|
| Creator | OpenAI | Moonshot AI |
| Type | Proprietary | Open Weight |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | 256K |
| Overall Score | 63.07 | 65.3 |
| Benchmarks Covered | 6 | 37 |
| Pricing (input/output) | $30.00 / $180.00 | $0.95 / $4.00 |

## Category Breakdown

### Agentic

- Winner: Coming soon
- GPT-5.5 Pro public-lane score: 60.6 (Estimated · #24/151)
- Kimi K2.6 public-lane score: 46.1 (Estimated · #88/151)

| Benchmark | GPT-5.5 Pro | Kimi K2.6 | Winner |
|-----------|-----------|-----------|--------|
| BrowseComp | 90.1% | 83.2% | GPT-5.5 Pro |
| Terminal-Bench 2.0 | Coming soon | 66.7% | Coming soon |
| OSWorld-Verified | Coming soon | 73.1% | Coming soon |
| Toolathlon | Coming soon | 50% | Coming soon |
| MCP Atlas | Coming soon | 55.9% | Coming soon |
| Claw-Eval | Coming soon | 62.3% | Coming soon |
| DeepSearchQA | Coming soon | 92.5% | Coming soon |
| WideResearch | Coming soon | 80.8% | Coming soon |
| Gert Labs | Coming soon | 56.82% | Coming soon |
| ResearchClawBench | Coming soon | 18.0% | Coming soon |
| OSWorld 2.0 | Coming soon | 4.6% | Coming soon |
| Terminal-Bench 2.1 (Vals) | Coming soon | 53.6% | Coming soon |

### Coding

- Winner: Coming soon
- GPT-5.5 Pro public-lane score: Coming soon
- Kimi K2.6 public-lane score: 51.6 (Supported · #62/183)

| Benchmark | GPT-5.5 Pro | Kimi K2.6 | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | Coming soon | 80.2% | Coming soon |
| LiveCodeBench v6 | Coming soon | 89.6% | Coming soon |
| SWE-bench Pro | Coming soon | 58.6% | Coming soon |
| SWE Multilingual | Coming soon | 76.7% | Coming soon |
| SciCode | Coming soon | 52.2% | Coming soon |
| Terminal-Bench 2.0 | Coming soon | 66.7% | Coming soon |
| Vibe Code Bench | Coming soon | 37.89% | Coming soon |
| cursorBench31 | Coming soon | 47.6% | Coming soon |
| LiveCodeBench (Vals) | Coming soon | 86.8% | Coming soon |
| SWE-bench (Vals) | Coming soon | 76.2% | Coming soon |

### Multimodal & Grounded

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

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

### Knowledge

- Winner: Coming soon
- GPT-5.5 Pro public-lane score: 61.1 (Estimated · #36/181)
- Kimi K2.6 public-lane score: 61.7 (Supported · #34/181)

| Benchmark | GPT-5.5 Pro | Kimi K2.6 | Winner |
|-----------|-----------|-----------|--------|
| HLE | 57.2% | 34.7% | GPT-5.5 Pro |
| HLE w/o tools | 43.1% | Coming soon | Coming soon |
| GPQA | Coming soon | 90.5% | Coming soon |
| GPQA-D | Coming soon | 90.5% | Coming soon |
| GPQA Diamond (Vals) | Coming soon | 89.1% | Coming soon |
| MMLU-Pro (Vals) | Coming soon | 87.6% | Coming soon |

### Mathematics

- Winner: Coming soon
- GPT-5.5 Pro public-lane score: 70.2 (Unranked · 3 rankable rows)
- Kimi K2.6 public-lane score: 71.3 (#1/7)

| Benchmark | GPT-5.5 Pro | Kimi K2.6 | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath (legacy) | 52.4% | Coming soon | Coming soon |
| FrontierMath v2 (Tiers 1-3) | 51.000% | 38.966% | GPT-5.5 Pro |
| FrontierMath v2 (Tier 4) | 39.600% | 14.580% | GPT-5.5 Pro |
| 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 Pro or Kimi K2.6?

Kimi K2.6 is ahead overall on BenchLM right now.

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

The widest category gap is in agentic, where the averages are 60.6 for GPT-5.5 Pro and 46.1 for Kimi K2.6.

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

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

## Explore More

- [GPT-5.5 Pro profile](/models/gpt-5-5-pro)
- [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)