# Claude Opus 5.5 vs Kimi K3.1 Pro

> Side-by-side benchmark comparison for Claude Opus 5.5 and Kimi K3.1 Pro across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/claude-opus-5-5-vs-kimi-3-1-pro
- Last updated: October 23, 2026

- Shared sourced benchmarks: 10
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Pick Claude Opus 5.5 if you want the stronger benchmark profile. Kimi K3.1 Pro only makes more sense when its price, context window, or workload-specific category wins matter more than the overall score.

## Summary

- Claude Opus 5.5 leads overall 86.6 to 82.
- The clearest category separation is in multimodal & grounded, where the averages are 91.8 for Claude Opus 5.5 and 98 for Kimi K3.1 Pro.
- The biggest single benchmark swing is OSWorld 2.0 in Agentic, with scores of 48.7% and 79.6%.
- Kimi K3.1 Pro is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.
- Kimi K3.1 Pro also has the larger context window at 1.05M.

## Model Snapshot

| Property | Claude Opus 5.5 | Kimi K3.1 Pro |
|----------|----------|----------|
| Creator | Anthropic | Moonshot AI |
| Type | Proprietary | Pending |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | 1.05M |
| Overall Score | 86.6 | null |
| Benchmarks Covered | 63 | 42 |
| Pricing (input/output) | $4.00 / $20.00 | $2.00 / $10.00 |

## Category Breakdown

### Agentic

- Winner: Not comparable
- Claude Opus 5.5 public-lane score: 90.4 (Supported · #1/132)
- Kimi K3.1 Pro public-lane score: Coming soon

| Benchmark | Claude Opus 5.5 | Kimi K3.1 Pro | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 4.0 | 66.40% | 65.70% | Claude Opus 5.5 |
| Terminal-Bench-Science 0.1 | 58.7% | 38.1% | Claude Opus 5.5 |
| AutomationBench | 40.0% | Coming soon | Coming soon |
| HLE w/ tools | 67.7% | 70.0% | Kimi K3.1 Pro |
| OSWorld 2.0 | 48.7% | 79.6% | Kimi K3.1 Pro |
| LAB all-pass (Harvey held-out) | 8.3% | Coming soon | Coming soon |
| LAB criterion-pass (Harvey held-out) | 91.2% | Coming soon | Coming soon |
| Toolathlon-Verified | 77.8% | Coming soon | Coming soon |
| Toolathlon Verified Pass@3 | 82.4% | Coming soon | Coming soon |
| Toolathlon Verified Pass³ | 72.2% | Coming soon | Coming soon |
| Toolathlon Verified avg. turns | 26.9 turns | Coming soon | Coming soon |
| CWE-bench v1 | 67.0% | Coming soon | Coming soon |
| Hermes Index | 63.3% | Coming soon | Coming soon |
| Hermes Bench | 76.7% | Coming soon | Coming soon |
| MazeBench | 13% | Coming soon | Coming soon |
| BrowseComp | Coming soon | 92.1% | Coming soon |
| BioMysteryBench | Coming soon | 80.6% | Coming soon |
| Agents' Last Exam | Coming soon | 43.2% | Coming soon |
| Agents' Last Exam (CLI) | Coming soon | 44.2% | Coming soon |
| APEX-Agents | Coming soon | 67.2% | Coming soon |
| Frontier Finance | Coming soon | 58.6% | Coming soon |
| HANDBOOK.md | Coming soon | 44.6% | Coming soon |
| Business Operation | Coming soon | 37.8% | Coming soon |
| Financial Modeling | Coming soon | 57.6% | Coming soon |
| Financial Research | Coming soon | 70.4% | Coming soon |
| Kimi Hallu Bench Hard (tools) | Coming soon | 8.3% | Coming soon |
| ExploitGym | Coming soon | 20.7% | Coming soon |

### Coding

- Winner: Not comparable
- Claude Opus 5.5 public-lane score: 82.7 (Supported · #2/153)
- Kimi K3.1 Pro public-lane score: Coming soon

| Benchmark | Claude Opus 5.5 | Kimi K3.1 Pro | Winner |
|-----------|-----------|-----------|--------|
| FrontierCode 1.1 Main | 54.4% | Coming soon | Coming soon |
| CursorBench 4.0 | 57.8% | Coming soon | Coming soon |
| SWE-bench Pro | 89.9% | Coming soon | Coming soon |
| SWE Multilingual | 93.9% | Coming soon | Coming soon |
| SWE Multimodal | 61.4% | Coming soon | Coming soon |
| DeepSWE | 74.2% | 75.5% | Kimi K3.1 Pro |
| FrontierCode 1.1 Extended | 63.6% | Coming soon | Coming soon |
| FrontierSWE v2 | 62.3% | Coming soon | Coming soon |
| ProgramBench | 91.2% | Coming soon | Coming soon |
| PostTrainBench v1.1 | 49.3% | Coming soon | Coming soon |
| Bug Hunt Bench | 41.7 fixes | Coming soon | Coming soon |
| ProgramBench (binary) | Coming soon | 31.5% | Coming soon |
| Kimi Code Bench v2 | Coming soon | 77.1% | Coming soon |
| Kimi Code Bench 3.0 Long-horizon | Coming soon | 61.2% | Coming soon |
| sweMarathon | Coming soon | 51.7% | Coming soon |
| PostTrainBench v1.2 | Coming soon | 36.5% | Coming soon |

### Reasoning

- Winner: Not comparable
- Claude Opus 5.5 public-lane score: 86.1 (#4/27)
- Kimi K3.1 Pro public-lane score: Coming soon

| Benchmark | Claude Opus 5.5 | Kimi K3.1 Pro | Winner |
|-----------|-----------|-----------|--------|
| STEMBench | 2.62 | Coming soon | Coming soon |
| ARC-AGI-1 | 97.50% | Coming soon | Coming soon |
| ARC-AGI-2 | 91.7% | Coming soon | Coming soon |
| GraphWalks BFS 256K–1M | 66.8% | Coming soon | Coming soon |

### Multimodal & Grounded

- Winner: Directional only
- Claude Opus 5.5 public-lane score: 91.8 (#3/56)
- Kimi K3.1 Pro public-lane score: 98 (#1/56)

| Benchmark | Claude Opus 5.5 | Kimi K3.1 Pro | Winner |
|-----------|-----------|-----------|--------|
| ExtractBench Pro | 51% | Coming soon | Coming soon |
| ExtractBench (LlamaIndex) | 86.06% | Coming soon | Coming soon |
| ParseBench | 79.85% | Coming soon | Coming soon |
| Chartography (tools) | 89.0% | 90.2% | Kimi K3.1 Pro |
| Chartography (no tools) | 64.4% | Coming soon | Coming soon |
| BenchCAD Vision2Code (no tools) | 0.730 | 0.728 | Claude Opus 5.5 |
| BenchCAD Vision2Code (tools) | 0.962 | 0.927 | Claude Opus 5.5 |
| Biomedical image analysis | 71.4% | Coming soon | Coming soon |
| OfficeQA | 78.9% | Coming soon | Coming soon |
| OfficeQA Pro | 67.7% | 67.4% | Claude Opus 5.5 |
| OfficeQA Pro v2 | Coming soon | 64.4% | Coming soon |
| MMMU-Pro | Coming soon | 84.1% | Coming soon |
| MMMU-Pro w/ Python | Coming soon | 90% | Coming soon |
| CharXiv | Coming soon | 93.4% | Coming soon |
| CharXiv w/o tools | Coming soon | 89% | Coming soon |
| BabyVision w/ Python | Coming soon | 95.4% | Coming soon |
| ZeroBench | Coming soon | 39.0% | Coming soon |
| ZeroBench w/ Python | Coming soon | 63.0% | Coming soon |
| GDP.pdf (Gemini judge) | Coming soon | 34.6% | Coming soon |
| GDP.pdf w/ Python (Gemini judge) | Coming soon | 85.7% | Coming soon |
| PerceptionBench | Coming soon | 68.3% | Coming soon |

### Knowledge

- Winner: Not comparable
- Claude Opus 5.5 public-lane score: 89.8 (Supported · #1/187)
- Kimi K3.1 Pro public-lane score: Coming soon

| Benchmark | Claude Opus 5.5 | Kimi K3.1 Pro | Winner |
|-----------|-----------|-----------|--------|
| HLE w/o tools | 64.4% | 51.1% | Claude Opus 5.5 |
| HealthBench (raw) | 68.1% | Coming soon | Coming soon |
| HealthBench (length-adjusted) | 60.6% | Coming soon | Coming soon |
| HealthBench Professional | 65.6% | Coming soon | Coming soon |
| HealthBench Professional (raw) | 77.1% | Coming soon | Coming soon |
| BioMysteryBench (human-solvable) | 89.3% | Coming soon | Coming soon |
| BioMysteryBench (human-difficult) | 50.0% | Coming soon | Coming soon |
| SpatialBench Verified | 72.0% | Coming soon | Coming soon |
| SingleCellBench | 61.2% | Coming soon | Coming soon |
| Morphology-to-molecule matching | 34.0% | Coming soon | Coming soon |
| Medicinal chemistry | 63.5% | Coming soon | Coming soon |
| Protein Design | 60.2% | Coming soon | Coming soon |
| Protein Design library ranking | 56.0% | Coming soon | Coming soon |
| De novo protein-binder design | 82.6% | Coming soon | Coming soon |
| Protocols (troubleshooting) | 73.7% | Coming soon | Coming soon |
| Protocols (understanding) | 69.0% | Coming soon | Coming soon |
| GPQA | Coming soon | 94.2% | Coming soon |
| GPQA-D | Coming soon | 94.2% | Coming soon |
| HLE | Coming soon | 70% | Coming soon |
| Kimi Hallu Bench | Coming soon | 5.4% | Coming soon |

### Multilingual

- Winner: Not comparable
- Claude Opus 5.5 public-lane score: Coming soon
- Kimi K3.1 Pro public-lane score: Coming soon

| Benchmark | Claude Opus 5.5 | Kimi K3.1 Pro | Winner |
|-----------|-----------|-----------|--------|
| GMMLU | 94.3% | Coming soon | Coming soon |
| MILU | 93.1% | Coming soon | Coming soon |

### Instruction Following

- Winner: Not comparable
- Claude Opus 5.5 public-lane score: Coming soon
- Kimi K3.1 Pro public-lane score: Coming soon

| Benchmark | Claude Opus 5.5 | Kimi K3.1 Pro | Winner |
|-----------|-----------|-----------|--------|
| Gray Swan IPI (15 attempts) | 1.0% | Coming soon | Coming soon |

### Mathematics

- Winner: Not comparable
- Claude Opus 5.5 public-lane score: 97.3 (Unranked · 4 rankable rows)
- Kimi K3.1 Pro public-lane score: Coming soon

| Benchmark | Claude Opus 5.5 | Kimi K3.1 Pro | Winner |
|-----------|-----------|-----------|--------|
| ArXivMath Aug. 2026 (no tools) | 91.2% | Coming soon | Coming soon |
| ArXivMath Aug. 2026 (tools) | 96.9% | Coming soon | Coming soon |
| FrontierMath v2 (Tiers 1-3) | 91.228% | Coming soon | Coming soon |
| FrontierMath v2 (Tier 4) | 95.000% | Coming soon | Coming soon |

## FAQ

### Which is better overall, Claude Opus 5.5 or Kimi K3.1 Pro?

Claude Opus 5.5 is ahead overall on BenchLM right now.

### Where is the biggest gap between Claude Opus 5.5 and Kimi K3.1 Pro?

The widest category gap is in multimodal & grounded, where the averages are 91.8 for Claude Opus 5.5 and 98 for Kimi K3.1 Pro.

### How many benchmarks does Claude Opus 5.5 cover on BenchLM?

Claude Opus 5.5 currently has 63 sourced benchmark scores on BenchLM.

### How many benchmarks does Kimi K3.1 Pro cover on BenchLM?

Kimi K3.1 Pro currently has 42 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Claude Opus 5.5 vs GPT-6.1 Sol](/compare/claude-opus-5-5-vs-gpt-6-1-sol)
- [Kimi K3.1 Pro vs GPT-6.1 Sol](/compare/gpt-6-1-sol-vs-kimi-3-1-pro)
- [Claude Opus 5.5 vs GPT-6 Astra](/compare/claude-opus-5-5-vs-gpt-6-astra)
- [Kimi K3.1 Pro vs GPT-6 Astra](/compare/gpt-6-astra-vs-kimi-3-1-pro)

## Explore More

- [Claude Opus 5.5 profile](/models/claude-opus-5-5)
- [Kimi K3.1 Pro profile](/models/kimi-3-1-pro)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)