# Claude Opus 4.5 vs Grok 4.20

> Side-by-side benchmark comparison for Claude Opus 4.5 and Grok 4.20 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

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

- Shared sourced benchmarks: 6
- HTML indexing: indexable
- Ranking lane: BenchAlign v5

## Quick Verdict

Pick Grok 4.20 if you want the stronger benchmark profile. Claude Opus 4.5 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 58.41.
- The clearest category separation is in reasoning, where the averages are 72.1 for Claude Opus 4.5 and 34.2 for Grok 4.20.
- The biggest single benchmark swing is Gert Labs in Agentic, with scores of 64.23% and 38.36%.
- Grok 4.20 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 | Claude Opus 4.5 | Grok 4.20 |
|----------|----------|----------|
| Creator | Anthropic | xAI |
| Type | Proprietary | Proprietary |
| Reasoning | Non-Reasoning | Reasoning |
| Context | 200K | 2M |
| Overall Score | 58.41 | 67.13 |
| Benchmarks Covered | 45 | 23 |
| Pricing (input/output) | $5.00 / $25.00 | $2.00 / $6.00 |

## Category Breakdown

### Agentic

- Winner: Coming soon
- Claude Opus 4.5 public-lane score: 43.2 (Estimated · #97/152)
- Grok 4.20 public-lane score: 26.7 (Supported · #145/152)

| Benchmark | Claude Opus 4.5 | Grok 4.20 | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.0 | 59.3% | 47.1% | Claude Opus 4.5 |
| OSWorld-Verified | 66.3% | Coming soon | Coming soon |
| OSWorld | 66.3% | Coming soon | Coming soon |
| Claw-Eval | 59.6% | Coming soon | Coming soon |
| QwenClawBench | 52.3% | Coming soon | Coming soon |
| τ³-bench results | 70.2% | Coming soon | Coming soon |
| VITA-Bench | 23.3% | Coming soon | Coming soon |
| DeepPlanning | 26.4% | Coming soon | Coming soon |
| Toolathlon | 43.5% | Coming soon | Coming soon |
| MCP Atlas | 42.3% | Coming soon | Coming soon |
| MCP-Tasks | 71.8% | Coming soon | Coming soon |
| WideResearch | 76.4% | Coming soon | Coming soon |
| CyberGym | 50.6% | Coming soon | Coming soon |
| Gert Labs | 64.23% | 38.36% | Claude Opus 4.5 |
| JobBench | 32.3% | Coming soon | Coming soon |
| DeepSearchQA | Coming soon | 62.8% | Coming soon |
| Terminal-Bench 2.1 (Vals) | Coming soon | 44.2% | Coming soon |

### Coding

- Winner: Coming soon
- Claude Opus 4.5 public-lane score: 56.6 (Estimated · #36/151)
- Grok 4.20 public-lane score: 28.2 (Supported · #141/151)

| Benchmark | Claude Opus 4.5 | Grok 4.20 | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 80.9% | 76.7% | Claude Opus 4.5 |
| LiveCodeBench v6 | 84.8% | Coming soon | Coming soon |
| SWE-bench Pro | 57.1% | 51.8% | Claude Opus 4.5 |
| SWE Multilingual | 77.5% | Coming soon | Coming soon |
| NL2Repo | 43.2% | Coming soon | Coming soon |
| LiveCodeBench Pro | Coming soon | 74.2% | Coming soon |
| Vibe Code Bench | Coming soon | 4.06% | Coming soon |
| LiveCodeBench (Vals) | Coming soon | 84.3% | Coming soon |
| SWE-bench (Vals) | Coming soon | 72.2% | Coming soon |

### Multimodal & Grounded

- Winner: Grok 4.20
- Claude Opus 4.5 public-lane score: 23.5 (#46/48)
- Grok 4.20 public-lane score: 34.6 (#43/48)

| Benchmark | Claude Opus 4.5 | Grok 4.20 | Winner |
|-----------|-----------|-----------|--------|
| MMMU-Pro | 70.6% | 75.2% | Grok 4.20 |
| MathVision | 74.3% | Coming soon | Coming soon |
| CharXiv | 68.5% | 60.9% | Claude Opus 4.5 |
| VideoMMMU | 84.4% | Coming soon | Coming soon |
| ScreenSpot Pro | 45.7% | Coming soon | Coming soon |
| V* | 67.0% | Coming soon | Coming soon |
| ERQA | Coming soon | 54.1% | Coming soon |
| SimpleVQA | Coming soon | 57.4% | Coming soon |
| MedXpertQA (MM) | Coming soon | 65.8% | Coming soon |

### Reasoning

- Winner: Coming soon
- Claude Opus 4.5 public-lane score: 72.1 (Unranked · 4 rankable rows)
- Grok 4.20 public-lane score: 34.2 (Unranked · 2 rankable rows)

| Benchmark | Claude Opus 4.5 | Grok 4.20 | Winner |
|-----------|-----------|-----------|--------|
| LongBench v2 | 64.4% | Coming soon | Coming soon |
| AI-Needle | 74% | Coming soon | Coming soon |
| ARC-AGI-2 | Coming soon | 53.3% | Coming soon |
| ARC-AGI-3 | Coming soon | 0.1% | Coming soon |

### Knowledge

- Winner: Coming soon
- Claude Opus 4.5 public-lane score: 53.9 (Estimated · #61/183)
- Grok 4.20 public-lane score: 49.4 (Supported · #85/183)

| Benchmark | Claude Opus 4.5 | Grok 4.20 | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 87% | Coming soon | Coming soon |
| SuperGPQA | 70.6% | Coming soon | Coming soon |
| MMLU-Pro | 89.5% | Coming soon | Coming soon |
| MMLU-Redux | 96.6% | Coming soon | Coming soon |
| C-Eval | 92.2% | Coming soon | Coming soon |
| HLE | 30.8% | Coming soon | Coming soon |
| GPQA-D | Coming soon | 88.5% | Coming soon |
| HLE w/o tools | Coming soon | 31.6% | Coming soon |
| HealthBench Hard | Coming soon | 20.3% | Coming soon |
| MedXpertQA (Text) | Coming soon | 50.2% | Coming soon |
| GPQA Diamond (Vals) | Coming soon | 88.6% | Coming soon |
| MMLU-Pro (Vals) | Coming soon | 86.3% | Coming soon |

### Instruction Following

- Winner: Coming soon
- Claude Opus 4.5 public-lane score: 39.5 (#105/123)
- Grok 4.20 public-lane score: Coming soon

| Benchmark | Claude Opus 4.5 | Grok 4.20 | Winner |
|-----------|-----------|-----------|--------|
| IFEval | 90.9% | Coming soon | Coming soon |
| IFBench | 58% | Coming soon | Coming soon |

### Multilingual

- Winner: Coming soon
- Claude Opus 4.5 public-lane score: 82.9 (#2/12)
- Grok 4.20 public-lane score: Coming soon

| Benchmark | Claude Opus 4.5 | Grok 4.20 | Winner |
|-----------|-----------|-----------|--------|
| MMLU-ProX | 85.7% | Coming soon | Coming soon |
| NOVA-63 | 56.7% | Coming soon | Coming soon |

### Mathematics

- Winner: Coming soon
- Claude Opus 4.5 public-lane score: 58.3 (#6/7)
- Grok 4.20 public-lane score: Coming soon

| Benchmark | Claude Opus 4.5 | Grok 4.20 | Winner |
|-----------|-----------|-----------|--------|
| AIME26 | 95.1% | Coming soon | Coming soon |
| HMMT Feb 2025 | 92.9% | Coming soon | Coming soon |
| HMMT Nov 2025 | 93.3% | Coming soon | Coming soon |
| HMMT Feb 2026 | 85.3% | Coming soon | Coming soon |
| MMAnswerBench | 84.0% | Coming soon | Coming soon |
| FrontierMath v2 (Tiers 1-3) | 20.690% | Coming soon | Coming soon |
| FrontierMath v2 (Tier 4) | 4.167% | Coming soon | Coming soon |

## FAQ

### Which is better overall, Claude Opus 4.5 or Grok 4.20?

Grok 4.20 is ahead overall on BenchLM right now.

### Where is the biggest gap between Claude Opus 4.5 and Grok 4.20?

The widest category gap is in reasoning, where the averages are 72.1 for Claude Opus 4.5 and 34.2 for Grok 4.20.

### How many benchmarks does Claude Opus 4.5 cover on BenchLM?

Claude Opus 4.5 currently has 45 sourced benchmark scores on BenchLM.

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

Grok 4.20 currently has 23 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Claude Opus 4.5 vs Claude Opus 4.5 Thinking](/compare/claude-opus-4-5-vs-claude-opus-4-5-thinking)
- [Grok 4.20 vs Claude Opus 4.5 Thinking](/compare/claude-opus-4-5-thinking-vs-grok-4-20-beta)
- [Claude Opus 4.5 vs Grok 4.20 Multi-agent](/compare/claude-opus-4-5-vs-grok-4-20-multi-agent-beta)
- [Grok 4.20 vs Grok 4.20 Multi-agent](/compare/grok-4-20-beta-vs-grok-4-20-multi-agent-beta)

## Explore More

- [Claude Opus 4.5 profile](/models/claude-opus-4-5)
- [Grok 4.20 profile](/models/grok-4-20-beta)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)