# Grok 4.20 vs Kimi K2.5 (Reasoning)

> Side-by-side benchmark comparison for Grok 4.20 and Kimi K2.5 (Reasoning) across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/grok-4-20-beta-vs-kimi-k2-5-reasoning
- Last updated: September 10, 2026

- Shared sourced benchmarks: 5
- HTML indexing: indexable
- Ranking lane: BenchAlign v5

## Quick Verdict

Pick Grok 4.20 if you want the stronger benchmark profile. Kimi K2.5 (Reasoning) only makes more sense when its price, context window, or workload-specific category wins matter more than the overall score.

## Summary

- Grok 4.20 leads overall 67.13 to 57.
- The clearest category separation is in multimodal & grounded, where the averages are 34.6 for Grok 4.20 and 63.2 for Kimi K2.5 (Reasoning).
- The biggest single benchmark swing is Vibe Code Bench in Coding, with scores of 4.06% and 17.54%.
- Kimi K2.5 (Reasoning) is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.
- Grok 4.20 also has the larger context window at 2M.

## Model Snapshot

| Property | Grok 4.20 | Kimi K2.5 (Reasoning) |
|----------|----------|----------|
| Creator | xAI | Moonshot AI |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 2M | 128K |
| Overall Score | 67.13 | 57 |
| Benchmarks Covered | 23 | 9 |
| Pricing (input/output) | $2.00 / $6.00 | $0.60 / $3.00 |

## Category Breakdown

### Agentic

- Winner: Coming soon
- Grok 4.20 public-lane score: 26.7 (Supported · #145/152)
- Kimi K2.5 (Reasoning) public-lane score: 48.2 (Estimated · #65/152)

| Benchmark | Grok 4.20 | Kimi K2.5 (Reasoning) | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.0 | 47.1% | 50.8% | Kimi K2.5 (Reasoning) |
| DeepSearchQA | 62.8% | Coming soon | Coming soon |
| Gert Labs | 38.36% | 32.58% | Grok 4.20 |
| Terminal-Bench 2.1 (Vals) | 44.2% | Coming soon | Coming soon |
| BrowseComp | Coming soon | 60.6% | Coming soon |

### Coding

- Winner: Coming soon
- Grok 4.20 public-lane score: 28.2 (Supported · #141/151)
- Kimi K2.5 (Reasoning) public-lane score: 50.7 (Estimated · #53/151)

| Benchmark | Grok 4.20 | Kimi K2.5 (Reasoning) | Winner |
|-----------|-----------|-----------|--------|
| LiveCodeBench Pro | 74.2% | Coming soon | Coming soon |
| SWE-bench Verified | 76.7% | 76.8% | Kimi K2.5 (Reasoning) |
| SWE-bench Pro | 51.8% | Coming soon | Coming soon |
| Vibe Code Bench | 4.06% | 17.54% | Kimi K2.5 (Reasoning) |
| LiveCodeBench (Vals) | 84.3% | Coming soon | Coming soon |
| SWE-bench (Vals) | 72.2% | Coming soon | Coming soon |

### Multimodal & Grounded

- Winner: Coming soon
- Grok 4.20 public-lane score: 34.6 (#43/48)
- Kimi K2.5 (Reasoning) public-lane score: 63.2 (Unranked · 1 rankable row)

| Benchmark | Grok 4.20 | Kimi K2.5 (Reasoning) | Winner |
|-----------|-----------|-----------|--------|
| MMMU-Pro | 75.2% | 78.5% | Kimi K2.5 (Reasoning) |
| CharXiv | 60.9% | Coming soon | Coming soon |
| ERQA | 54.1% | Coming soon | Coming soon |
| SimpleVQA | 57.4% | Coming soon | Coming soon |
| MedXpertQA (MM) | 65.8% | Coming soon | Coming soon |

### Reasoning

- Winner: Coming soon
- Grok 4.20 public-lane score: 34.2 (Unranked · 2 rankable rows)
- Kimi K2.5 (Reasoning) public-lane score: Coming soon

| Benchmark | Grok 4.20 | Kimi K2.5 (Reasoning) | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-2 | 53.3% | Coming soon | Coming soon |
| ARC-AGI-3 | 0.1% | Coming soon | Coming soon |

### Knowledge

- Winner: Coming soon
- Grok 4.20 public-lane score: 49.4 (Supported · #85/183)
- Kimi K2.5 (Reasoning) public-lane score: 50.7 (Estimated · #75/183)

| Benchmark | Grok 4.20 | Kimi K2.5 (Reasoning) | Winner |
|-----------|-----------|-----------|--------|
| GPQA-D | 88.5% | Coming soon | Coming soon |
| HLE w/o tools | 31.6% | Coming soon | Coming soon |
| HealthBench Hard | 20.3% | Coming soon | Coming soon |
| MedXpertQA (Text) | 50.2% | Coming soon | Coming soon |
| GPQA Diamond (Vals) | 88.6% | Coming soon | Coming soon |
| MMLU-Pro (Vals) | 86.3% | Coming soon | Coming soon |
| GPQA | Coming soon | 87.6% | Coming soon |
| MMLU-Pro | Coming soon | 87.1% | Coming soon |

### Mathematics

- Winner: Coming soon
- Grok 4.20 public-lane score: Coming soon
- Kimi K2.5 (Reasoning) public-lane score: Coming soon

| Benchmark | Grok 4.20 | Kimi K2.5 (Reasoning) | Winner |
|-----------|-----------|-----------|--------|
| AIME 2025 | Coming soon | 96.1% | Coming soon |

## FAQ

### Which is better overall, Grok 4.20 or Kimi K2.5 (Reasoning)?

Grok 4.20 is ahead overall on BenchLM right now.

### Where is the biggest gap between Grok 4.20 and Kimi K2.5 (Reasoning)?

The widest category gap is in multimodal & grounded, where the averages are 34.6 for Grok 4.20 and 63.2 for Kimi K2.5 (Reasoning).

### How many benchmarks does Grok 4.20 cover on BenchLM?

Grok 4.20 currently has 23 sourced benchmark scores on BenchLM.

### How many benchmarks does Kimi K2.5 (Reasoning) cover on BenchLM?

Kimi K2.5 (Reasoning) currently has 9 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Grok 4.20 vs Grok 4.20 Multi-agent](/compare/grok-4-20-beta-vs-grok-4-20-multi-agent-beta)
- [Kimi K2.5 (Reasoning) vs Grok 4.20 Multi-agent](/compare/grok-4-20-multi-agent-beta-vs-kimi-k2-5-reasoning)
- [Grok 4.20 vs Kimi K2.5](/compare/grok-4-20-beta-vs-kimi-k2-5)
- [Kimi K2.5 (Reasoning) vs Kimi K2.5](/compare/kimi-k2-5-vs-kimi-k2-5-reasoning)

## Explore More

- [Grok 4.20 profile](/models/grok-4-20-beta)
- [Kimi K2.5 (Reasoning) profile](/models/kimi-k2-5-reasoning)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)