# Grok 4.5 vs Kimi K3

> Side-by-side benchmark comparison for Grok 4.5 and Kimi K3 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/grok-4-5-vs-kimi-k3
- Last updated: September 27, 2026

- Shared sourced benchmarks: 9
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.7

## Quick Verdict

Pick Kimi K3 if you want the stronger benchmark profile. Grok 4.5 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 71.87 to 65.27.
- The clearest category separation is in reasoning, where the averages are 50.3 for Grok 4.5 and 65.4 for Kimi K3.
- The biggest single benchmark swing is VulcanBench v3 in Coding, with scores of 89.9% and 73.7%.
- Grok 4.5 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 | Grok 4.5 | Kimi K3 |
|----------|----------|----------|
| Creator | xAI | Moonshot AI |
| Type | Proprietary | Pending |
| Reasoning | Reasoning | Reasoning |
| Context | 500K | 1.05M |
| Overall Score | 65.27 | 71.87 |
| Benchmarks Covered | 15 | 46 |
| Pricing (input/output) | $2.00 / $6.00 | $3.00 / $15.00 |

## Category Breakdown

### Agentic

- Winner: Kimi K3
- Grok 4.5 public-lane score: 57.9 (Supported · #21/105)
- Kimi K3 public-lane score: 70 (Supported · #6/105)

| Benchmark | Grok 4.5 | Kimi K3 | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 3.0 | 15.7% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | 83.3% | 88.3% | Kimi K3 |
| deepSwe | 53% | Coming soon | Coming soon |
| Terminal-Bench 2.1 (Vals) | 67.8% | 80.9% | Kimi K3 |
| BrowseComp | Coming soon | 91.2% | Coming soon |
| DeepSearchQA | Coming soon | 95.0% | Coming soon |
| Toolathlon-Verified | Coming soon | 73.2% | Coming soon |
| MCP Atlas | Coming soon | 84.2% | 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: Kimi K3
- Grok 4.5 public-lane score: 58.1 (Supported · #19/135)
- Kimi K3 public-lane score: 62.6 (Supported · #13/135)

| Benchmark | Grok 4.5 | Kimi K3 | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Pro | 64.7% | Coming soon | Coming soon |
| SWE Multilingual | 78% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | 83.3% | Coming soon | Coming soon |
| cursorBench32 | 66.7% | 60.8% | Grok 4.5 |
| VulcanBench v3 | 89.9% | 73.7% | Grok 4.5 |
| LiveCodeBench (Vals) | 87.4% | 87.2% | Grok 4.5 |
| SWE-bench (Vals) | 86.6% | 93.4% | Kimi K3 |
| 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 |
| OpenHarmony Bench | Coming soon | 57.3% | Coming soon |
| FrontierSWE v2 | Coming soon | 25.9% | Coming soon |

### Reasoning

- Winner: Directional only
- Grok 4.5 public-lane score: 50.3 (#19/19)
- Kimi K3 public-lane score: 65.4 (#11/19)

| Benchmark | Grok 4.5 | Kimi K3 | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-2 | 52.6% | 60.4% | Kimi K3 |
| ARC-AGI-3 | 0.3% | Coming soon | Coming soon |
| ARC-AGI-1 | Coming soon | 94.50% | Coming soon |

### Multimodal & Grounded

- Winner: Not comparable
- Grok 4.5 public-lane score: 78.5 (Unranked · 1 rankable row)
- Kimi K3 public-lane score: 89.4 (#1/50)

| Benchmark | Grok 4.5 | Kimi K3 | Winner |
|-----------|-----------|-----------|--------|
| OfficeQA Pro | Coming soon | 63.3% | Coming soon |
| MMMU-Pro | Coming soon | 81.6% | Coming soon |
| MMMU-Pro w/ Python | Coming soon | 83.4% | Coming soon |
| CharXiv w/o tools | Coming soon | 84.8% | Coming soon |
| CharXiv | Coming soon | 91.3% | 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: Kimi K3
- Grok 4.5 public-lane score: 66.8 (Supported · #17/158)
- Kimi K3 public-lane score: 68.5 (Supported · #14/158)

| Benchmark | Grok 4.5 | Kimi K3 | Winner |
|-----------|-----------|-----------|--------|
| GPQA Diamond (Vals) | 92.9% | 92.9% | Tie |
| MMLU-Pro (Vals) | 89.2% | 88.0% | Grok 4.5 |
| GPQA | Coming soon | 93.5% | Coming soon |
| GPQA-D | Coming soon | 93.5% | Coming soon |
| HLE | Coming soon | 56% | Coming soon |
| HLE w/o tools | Coming soon | 43.5% | Coming soon |

## FAQ

### Which is better overall, Grok 4.5 or Kimi K3?

Kimi K3 is ahead overall on BenchLM right now.

### Where is the biggest gap between Grok 4.5 and Kimi K3?

The widest category gap is in reasoning, where the averages are 50.3 for Grok 4.5 and 65.4 for Kimi K3.

### How many benchmarks does Grok 4.5 cover on BenchLM?

Grok 4.5 currently has 15 sourced benchmark scores on BenchLM.

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

Kimi K3 currently has 46 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Grok 4.5 vs GPT-6 Astra](/compare/gpt-6-astra-vs-grok-4-5)
- [Kimi K3 vs GPT-6 Astra](/compare/gpt-6-astra-vs-kimi-k3)
- [Grok 4.5 vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-grok-4-5)
- [Kimi K3 vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-kimi-k3)

## Explore More

- [Grok 4.5 profile](/models/grok-4-5)
- [Kimi K3 profile](/models/kimi-k3)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)