# Claude Opus 4.8 vs Grok 4.5

> Side-by-side benchmark comparison for Claude Opus 4.8 and Grok 4.5 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/claude-opus-4-8-vs-grok-4-5
- Last updated: October 7, 2026

- Shared sourced benchmarks: 15
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Pick Claude Opus 4.8 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

- Claude Opus 4.8 leads overall 69.11 to 63.97.
- The clearest category separation is in reasoning, where the averages are 59.1 for Claude Opus 4.8 and 50.4 for Grok 4.5.
- The biggest single benchmark swing is ARC-AGI-2 in Reasoning, with scores of 72.1% and 52.6%.
- Grok 4.5 is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.
- Claude Opus 4.8 also has the larger context window at 1M.

## Model Snapshot

| Property | Claude Opus 4.8 | Grok 4.5 |
|----------|----------|----------|
| Creator | Anthropic | xAI |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | 500K |
| Overall Score | 69.11 | 63.97 |
| Benchmarks Covered | 40 | 17 |
| Pricing (input/output) | $5.00 / $25.00 | $2.00 / $6.00 |

## Category Breakdown

### Agentic

- Winner: Claude Opus 4.8
- Claude Opus 4.8 public-lane score: 61.6 (Supported · #20/122)
- Grok 4.5 public-lane score: 57.6 (Supported · #29/122)

| Benchmark | Claude Opus 4.8 | Grok 4.5 | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 3.0 | 21.1% | 15.7% | Claude Opus 4.8 |
| Terminal-Bench 2.1 | 74.6% | 83.3% | Grok 4.5 |
| BrowseComp | 84.3% | Coming soon | Coming soon |
| DeepSearchQA | 93.1% | Coming soon | Coming soon |
| OSWorld-Verified | 83.4% | Coming soon | Coming soon |
| Finance Agent v2 | 53.9% | Coming soon | Coming soon |
| MCP Atlas | 82.2% | Coming soon | Coming soon |
| 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% | 67.8% | Claude Opus 4.8 |
| deepSwe | Coming soon | 53% | Coming soon |

### Coding

- Winner: Claude Opus 4.8
- Claude Opus 4.8 public-lane score: 61.5 (Supported · #18/146)
- Grok 4.5 public-lane score: 57.7 (Supported · #27/146)

| Benchmark | Claude Opus 4.8 | Grok 4.5 | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 88.6% | Coming soon | Coming soon |
| SWE-bench Pro | 69.2% | 64.7% | Claude Opus 4.8 |
| SWE Multilingual | 84.4% | 78% | Claude Opus 4.8 |
| SWE Multimodal | 38.4% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | 74.6% | 83.3% | Grok 4.5 |
| cursorBench31 | 58.4% | Coming soon | Coming soon |
| CursorBench 3.2 | 62.3% | 66.7% | Grok 4.5 |
| FrontierCode 1.1 Main | 46.5% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | 87.8% | 87.4% | Claude Opus 4.8 |
| SWE-bench (Vals) | 88.6% | 86.6% | Claude Opus 4.8 |
| PostTrainBench v1.1 | 32.9% | 23.4% | Claude Opus 4.8 |
| VulcanBench v3 | Coming soon | 89.9% | Coming soon |

### Reasoning

- Winner: Claude Opus 4.8
- Claude Opus 4.8 public-lane score: 59.1 (#23/28)
- Grok 4.5 public-lane score: 50.4 (#28/28)

| Benchmark | Claude Opus 4.8 | Grok 4.5 | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-2 | 72.1% | 52.6% | Claude Opus 4.8 |
| ARC-AGI-3 | 1.5% | 0.3% | Claude Opus 4.8 |
| ARC-AGI-1 | 92.50% | 85.67% | Claude Opus 4.8 |

### Multimodal & Grounded

- Winner: Not comparable
- Claude Opus 4.8 public-lane score: 87.7 (#7/49)
- Grok 4.5 public-lane score: 79.5 (Unranked · 1 rankable row)

| Benchmark | Claude Opus 4.8 | Grok 4.5 | Winner |
|-----------|-----------|-----------|--------|
| OfficeQA Pro | 66.2% | Coming soon | Coming soon |
| ScreenSpot Pro | 87.9% | Coming soon | Coming soon |
| CharXiv | 89.9% | Coming soon | Coming soon |
| CharXiv w/o tools | 80.5% | Coming soon | Coming soon |

### Knowledge

- Winner: Claude Opus 4.8
- Claude Opus 4.8 public-lane score: 69.3 (Supported · #15/174)
- Grok 4.5 public-lane score: 67 (Supported · #19/174)

| Benchmark | Claude Opus 4.8 | Grok 4.5 | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 93.6% | Coming soon | Coming soon |
| GPQA-D | 93.6% | Coming soon | Coming soon |
| HLE | 57.9% | Coming soon | Coming soon |
| HLE w/o tools | 49.8% | Coming soon | Coming soon |
| GPQA Diamond (Vals) | 92.4% | 92.9% | Grok 4.5 |
| MMLU-Pro (Vals) | 89.6% | 89.2% | Claude Opus 4.8 |

### Multilingual

- Winner: Not comparable
- Claude Opus 4.8 public-lane score: Coming soon
- Grok 4.5 public-lane score: Coming soon

| Benchmark | Claude Opus 4.8 | Grok 4.5 | Winner |
|-----------|-----------|-----------|--------|
| INCLUDE | 87.6% | Coming soon | Coming soon |

### Instruction Following

- Winner: Not comparable
- Claude Opus 4.8 public-lane score: 74 (#60/125)
- Grok 4.5 public-lane score: Coming soon

### Mathematics

- Winner: Not comparable
- Claude Opus 4.8 public-lane score: 65.2 (#2/7)
- Grok 4.5 public-lane score: Coming soon

| Benchmark | Claude Opus 4.8 | Grok 4.5 | 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 Grok 4.5?

Claude Opus 4.8 is ahead overall on BenchLM right now.

### Where is the biggest gap between Claude Opus 4.8 and Grok 4.5?

The widest category gap is in reasoning, where the averages are 59.1 for Claude Opus 4.8 and 50.4 for Grok 4.5.

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

Claude Opus 4.8 currently has 40 sourced benchmark scores on BenchLM.

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

Grok 4.5 currently has 17 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Claude Opus 4.8 vs Claude Opus 5.5](/compare/claude-opus-4-8-vs-claude-opus-5-5)
- [Grok 4.5 vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-grok-4-5)
- [Claude Opus 4.8 vs GPT-6 Astra](/compare/claude-opus-4-8-vs-gpt-6-astra)
- [Grok 4.5 vs GPT-6 Astra](/compare/gpt-6-astra-vs-grok-4-5)

## Explore More

- [Claude Opus 4.8 profile](/models/claude-opus-4-8)
- [Grok 4.5 profile](/models/grok-4-5)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)