# Claude Opus 4.8 vs Kimi K3

> Side-by-side benchmark comparison for Claude Opus 4.8 and Kimi K3 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/claude-opus-4-8-vs-kimi-k3
- Last updated: October 2, 2026

- Shared sourced benchmarks: 19
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Pick Kimi K3 if you want the stronger benchmark profile. Claude Opus 4.8 only makes more sense when its price, context window, or workload-specific category wins matter more than the overall score.

## Summary

- Kimi K3 leads overall 72.14 to 70.82.
- The clearest category separation is in agentic, where the averages are 61.3 for Claude Opus 4.8 and 68.1 for Kimi K3.
- The biggest single benchmark swing is Terminal-Bench 2.1 in Agentic, with scores of 74.6% and 88.3%.
- Kimi K3 is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.
- Kimi K3 also has the larger context window at 1.05M.

## Model Snapshot

| Property | Claude Opus 4.8 | Kimi K3 |
|----------|----------|----------|
| Creator | Anthropic | Moonshot AI |
| Type | Proprietary | Pending |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | 1.05M |
| Overall Score | 70.82 | 72.14 |
| Benchmarks Covered | 39 | 48 |
| Pricing (input/output) | $5.00 / $25.00 | $3.00 / $15.00 |

## Category Breakdown

### Agentic

- Winner: Kimi K3
- Claude Opus 4.8 public-lane score: 61.3 (Supported · #19/119)
- Kimi K3 public-lane score: 68.1 (Supported · #8/119)

| Benchmark | Claude Opus 4.8 | Kimi K3 | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 3.0 | 21.1% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | 74.6% | 88.3% | Kimi K3 |
| BrowseComp | 84.3% | 91.2% | Kimi K3 |
| DeepSearchQA | 93.1% | 95.0% | Kimi K3 |
| OSWorld-Verified | 83.4% | Coming soon | Coming soon |
| Finance Agent v2 | 53.9% | Coming soon | Coming soon |
| MCP Atlas | 82.2% | 84.2% | Kimi K3 |
| Toolathlon | 59.9% | Coming soon | Coming soon |
| Gert Labs | 72.97% | Coming soon | Coming soon |
| ResearchClawBench | 21.1% | Coming soon | Coming soon |
| OSWorld 2.0 | 20.6% | Coming soon | Coming soon |
| Terminal-Bench 2.1 (Vals) | 71.9% | 80.9% | Kimi K3 |
| Toolathlon-Verified | Coming soon | 73.2% | Coming soon |
| AutomationBench | Coming soon | 30.8% | Coming soon |
| JobBench | Coming soon | 52.9% | Coming soon |
| APEX-Agents | Coming soon | 37.6% | Coming soon |
| SpreadsheetBench 2 | Coming soon | 34.8% | Coming soon |
| DECK-Bench | Coming soon | 73.5% | Coming soon |
| ApprenticeBench | Coming soon | 18% | Coming soon |

### Coding

- Winner: Claude Opus 4.8
- Claude Opus 4.8 public-lane score: 62.2 (Supported · #14/144)
- Kimi K3 public-lane score: 61.4 (Supported · #18/144)

| Benchmark | Claude Opus 4.8 | Kimi K3 | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 88.6% | Coming soon | Coming soon |
| SWE-bench Pro | 69.2% | Coming soon | Coming soon |
| SWE Multilingual | 84.4% | Coming soon | Coming soon |
| SWE Multimodal | 38.4% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | 74.6% | Coming soon | Coming soon |
| cursorBench31 | 58.4% | Coming soon | Coming soon |
| CursorBench 3.2 | 62.3% | 60.8% | Claude Opus 4.8 |
| FrontierCode 1.1 Main | 46.5% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | 87.8% | 87.2% | Claude Opus 4.8 |
| SWE-bench (Vals) | 88.6% | 93.4% | Kimi K3 |
| PostTrainBench v1.1 | 32.9% | 32.0% | Claude Opus 4.8 |
| DeepSWE | Coming soon | 67.5% | Coming soon |
| FrontierSWE | Coming soon | 81.2% | Coming soon |
| ProgramBench | Coming soon | 77.8% | Coming soon |
| Kimi Code Bench v2 | Coming soon | 72.9% | Coming soon |
| sweMarathon | Coming soon | 42% | Coming soon |
| PostTrain Bench | Coming soon | 36.6% | Coming soon |
| MLS-Bench Lite | Coming soon | 48.3% | Coming soon |
| VulcanBench v3 | Coming soon | 73.7% | Coming soon |
| OpenHarmony Bench | Coming soon | 57.3% | Coming soon |
| FrontierSWE v2 | Coming soon | 25.9% | Coming soon |

### Reasoning

- Winner: Directional only
- Claude Opus 4.8 public-lane score: 59.1 (#22/27)
- Kimi K3 public-lane score: 65.8 (#18/27)

| Benchmark | Claude Opus 4.8 | Kimi K3 | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-2 | 72.1% | 60.4% | Claude Opus 4.8 |
| ARC-AGI-3 | 1.5% | Coming soon | Coming soon |
| ARC-AGI-1 | Coming soon | 94.50% | Coming soon |

### Multimodal & Grounded

- Winner: Directional only
- Claude Opus 4.8 public-lane score: 87.7 (#7/49)
- Kimi K3 public-lane score: 89.4 (#1/49)

| Benchmark | Claude Opus 4.8 | Kimi K3 | Winner |
|-----------|-----------|-----------|--------|
| OfficeQA Pro | 66.2% | 63.3% | Claude Opus 4.8 |
| ScreenSpot Pro | 87.9% | Coming soon | Coming soon |
| CharXiv | 89.9% | 91.3% | Kimi K3 |
| CharXiv w/o tools | 80.5% | 84.8% | Kimi K3 |
| MMMU-Pro | Coming soon | 81.6% | Coming soon |
| MMMU-Pro w/ Python | Coming soon | 83.4% | Coming soon |
| MathVision | Coming soon | 94.3% | Coming soon |
| MathVision w/ Python | Coming soon | 97.8% | Coming soon |
| BabyVision w/ Python | Coming soon | 85.7% | Coming soon |
| ZeroBench | Coming soon | 23.0% | Coming soon |
| ZeroBench w/ Python | Coming soon | 41.0% | Coming soon |
| WorldVQA ForceAnswer | Coming soon | 51.0% | Coming soon |
| OmniDocBench | Coming soon | 91.1% | Coming soon |
| PerceptionBench | Coming soon | 58.5% | Coming soon |

### Knowledge

- Winner: Claude Opus 4.8
- Claude Opus 4.8 public-lane score: 69.7 (Supported · #14/171)
- Kimi K3 public-lane score: 67.9 (Supported · #18/171)

| Benchmark | Claude Opus 4.8 | Kimi K3 | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 93.6% | 93.5% | Claude Opus 4.8 |
| GPQA-D | 93.6% | 93.5% | Claude Opus 4.8 |
| HLE | 57.9% | 56% | Claude Opus 4.8 |
| HLE w/o tools | 49.8% | 43.5% | Claude Opus 4.8 |
| GPQA Diamond (Vals) | 92.4% | 92.9% | Kimi K3 |
| MMLU-Pro (Vals) | 89.6% | 88.0% | Claude Opus 4.8 |

### Multilingual

- Winner: Not comparable
- Claude Opus 4.8 public-lane score: Coming soon
- Kimi K3 public-lane score: Coming soon

| Benchmark | Claude Opus 4.8 | Kimi K3 | Winner |
|-----------|-----------|-----------|--------|
| INCLUDE | 87.6% | Coming soon | Coming soon |

### Instruction Following

- Winner: Not comparable
- Claude Opus 4.8 public-lane score: 74 (#60/125)
- Kimi K3 public-lane score: Coming soon

| Benchmark | Claude Opus 4.8 | Kimi K3 | Winner |
|-----------|-----------|-----------|--------|
| Gray Swan IPI (15 attempts) | Coming soon | 52.7% | Coming soon |

### Mathematics

- Winner: Not comparable
- Claude Opus 4.8 public-lane score: 65.2 (#2/7)
- Kimi K3 public-lane score: Coming soon

| Benchmark | Claude Opus 4.8 | Kimi K3 | Winner |
|-----------|-----------|-----------|--------|
| USAMO 2026 | 96.7% | Coming soon | Coming soon |
| FrontierMath v2 (Tiers 1-3) | 47.241% | Coming soon | Coming soon |
| FrontierMath v2 (Tier 4) | 31.250% | Coming soon | Coming soon |

## FAQ

### Which is better overall, Claude Opus 4.8 or Kimi K3?

Kimi K3 is ahead overall on BenchLM right now.

### Where is the biggest gap between Claude Opus 4.8 and Kimi K3?

The widest category gap is in agentic, where the averages are 61.3 for Claude Opus 4.8 and 68.1 for Kimi K3.

### How many benchmarks does Claude Opus 4.8 cover on BenchLM?

Claude Opus 4.8 currently has 39 sourced benchmark scores on BenchLM.

### How many benchmarks does Kimi K3 cover on BenchLM?

Kimi K3 currently has 48 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Claude Opus 4.8 vs GPT-6 Astra](/compare/claude-opus-4-8-vs-gpt-6-astra)
- [Kimi K3 vs GPT-6 Astra](/compare/gpt-6-astra-vs-kimi-k3)
- [Claude Opus 4.8 vs Claude Opus 5.5](/compare/claude-opus-4-8-vs-claude-opus-5-5)
- [Kimi K3 vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-kimi-k3)

## Explore More

- [Claude Opus 4.8 profile](/models/claude-opus-4-8)
- [Kimi K3 profile](/models/kimi-k3)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)