# Claude Opus 4.8 vs Gemini 3.1 Pro

> Side-by-side benchmark comparison for Claude Opus 4.8 and Gemini 3.1 Pro across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/claude-opus-4-8-vs-gemini-3-1-pro
- Last updated: October 10, 2026

- Shared sourced benchmarks: 17
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Claude Opus 4.8 leads by point estimate. Conditional score ranges do not establish rank confidence. Choose using the category evidence and your own workload tests.

## Summary

- Claude Opus 4.8 has the higher overall point estimate 69.12 to 65.17. Conditional score ranges do not establish rank confidence.
- The clearest category separation is in agentic, where the averages are 61.6 for Claude Opus 4.8 and 38.3 for Gemini 3.1 Pro.
- The biggest single benchmark swing is DeepSearchQA in Agentic, with scores of 93.1% and 69.7%.
- Gemini 3.1 Pro is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.

## Model Snapshot

| Property | Claude Opus 4.8 | Gemini 3.1 Pro |
|----------|----------|----------|
| Creator | Anthropic | Google |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | 1M |
| Overall Score | 69.12 | 65.17 |
| Benchmarks Covered | 40 | 29 |
| Pricing (input/output) | $5.00 / $25.00 | $2.00 / $12.00 |

## Category Breakdown

### Agentic

- Winner: Claude Opus 4.8
- Claude Opus 4.8 public-lane score: 61.6 (Supported · #20/123)
- Gemini 3.1 Pro public-lane score: 38.3 (Supported · #66/123)

| Benchmark | Claude Opus 4.8 | Gemini 3.1 Pro | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 3.0 | 21.1% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | 74.6% | Coming soon | Coming soon |
| BrowseComp | 84.3% | Coming soon | Coming soon |
| DeepSearchQA | 93.1% | 69.7% | Claude Opus 4.8 |
| 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% | 56.87% | Claude Opus 4.8 |
| ResearchClawBench | 21.1% | 13.3% | Claude Opus 4.8 |
| OSWorld 2.0 | 20.6% | Coming soon | Coming soon |
| Terminal-Bench 2.1 (Vals) | 71.9% | 70.8% | Claude Opus 4.8 |
| Claw-Eval | Coming soon | 57.8% | Coming soon |
| τ²-bench results | Coming soon | 95.6% | Coming soon |

### Coding

- Winner: Claude Opus 4.8
- Claude Opus 4.8 public-lane score: 60.8 (Supported · #19/146)
- Gemini 3.1 Pro public-lane score: 40.2 (Supported · #63/146)

| Benchmark | Claude Opus 4.8 | Gemini 3.1 Pro | 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% | Coming soon | Coming soon |
| FrontierCode 1.1 Main | 46.5% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | 87.8% | 88.5% | Gemini 3.1 Pro |
| SWE-bench (Vals) | 88.6% | 78.8% | Claude Opus 4.8 |
| PostTrainBench v1.1 | 32.9% | 22.0% | Claude Opus 4.8 |
| LiveCodeBench Pro | Coming soon | 82.9% | Coming soon |
| React Native Evals | Coming soon | 78.9% | Coming soon |
| Vibe Code Bench | Coming soon | 32.03% | Coming soon |

### Reasoning

- Winner: Not comparable
- Claude Opus 4.8 public-lane score: 62.9 (#24/28)
- Gemini 3.1 Pro public-lane score: 58.2 (Unranked · 2 rankable rows)

| Benchmark | Claude Opus 4.8 | Gemini 3.1 Pro | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-2 | 72.1% | 77.1% | Gemini 3.1 Pro |
| ARC-AGI-3 | 1.5% | 0.4% | Claude Opus 4.8 |
| ARC-AGI-1 | 92.50% | Coming soon | Coming soon |

### Multimodal & Grounded

- Winner: Directional only
- Claude Opus 4.8 public-lane score: 91.2 (#5/54)
- Gemini 3.1 Pro public-lane score: 80.1 (#17/54)

| Benchmark | Claude Opus 4.8 | Gemini 3.1 Pro | Winner |
|-----------|-----------|-----------|--------|
| OfficeQA Pro | 66.2% | Coming soon | Coming soon |
| ScreenSpot Pro | 87.9% | 84.4% | Claude Opus 4.8 |
| CharXiv | 89.9% | 80.2% | Claude Opus 4.8 |
| CharXiv w/o tools | 80.5% | Coming soon | Coming soon |
| MMMU-Pro | Coming soon | 83.9% | Coming soon |
| ERQA | Coming soon | 69.4% | Coming soon |
| SimpleVQA | Coming soon | 72.4% | Coming soon |
| ZeroBench | Coming soon | 29.0% | Coming soon |
| MedXpertQA (MM) | Coming soon | 81.3% | Coming soon |

### Knowledge

- Winner: Claude Opus 4.8
- Claude Opus 4.8 public-lane score: 70.7 (Supported · #14/177)
- Gemini 3.1 Pro public-lane score: 67.2 (Supported · #23/177)

| Benchmark | Claude Opus 4.8 | Gemini 3.1 Pro | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 93.6% | Coming soon | Coming soon |
| GPQA-D | 93.6% | 94.3% | Gemini 3.1 Pro |
| HLE | 57.9% | Coming soon | Coming soon |
| HLE w/o tools | 49.8% | 45.4% | Claude Opus 4.8 |
| GPQA Diamond (Vals) | 92.4% | 95.5% | Gemini 3.1 Pro |
| MMLU-Pro (Vals) | 89.6% | 91.0% | Gemini 3.1 Pro |
| HealthBench Hard | Coming soon | 20.6% | Coming soon |
| MedXpertQA (Text) | Coming soon | 71.5% | Coming soon |

### Multilingual

- Winner: Not comparable
- Claude Opus 4.8 public-lane score: Coming soon
- Gemini 3.1 Pro public-lane score: Coming soon

| Benchmark | Claude Opus 4.8 | Gemini 3.1 Pro | Winner |
|-----------|-----------|-----------|--------|
| INCLUDE | 87.6% | Coming soon | Coming soon |

### Instruction Following

- Winner: Not comparable
- Claude Opus 4.8 public-lane score: 75.4 (#61/127)
- Gemini 3.1 Pro public-lane score: Coming soon

### Mathematics

- Winner: Not comparable
- Claude Opus 4.8 public-lane score: 65.7 (#2/7)
- Gemini 3.1 Pro public-lane score: 54.7 (Unranked · 2 rankable rows)

| Benchmark | Claude Opus 4.8 | Gemini 3.1 Pro | Winner |
|-----------|-----------|-----------|--------|
| USAMO 2026 | 96.7% | Coming soon | Coming soon |
| FrontierMath v2 (Tiers 1-3) | 47.241% | 36.900% | Claude Opus 4.8 |
| FrontierMath v2 (Tier 4) | 31.250% | 16.700% | Claude Opus 4.8 |

## FAQ

### Which is better overall, Claude Opus 4.8 or Gemini 3.1 Pro?

Claude Opus 4.8 has the higher overall point estimate. Conditional score ranges do not establish rank confidence.

### Where is the biggest gap between Claude Opus 4.8 and Gemini 3.1 Pro?

The widest category gap is in agentic, where the averages are 61.6 for Claude Opus 4.8 and 38.3 for Gemini 3.1 Pro.

### 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 Gemini 3.1 Pro cover on BenchLM?

Gemini 3.1 Pro currently has 29 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)
- [Gemini 3.1 Pro vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-gemini-3-1-pro)
- [Claude Opus 4.8 vs GPT-6 Astra](/compare/claude-opus-4-8-vs-gpt-6-astra)
- [Gemini 3.1 Pro vs GPT-6 Astra](/compare/gemini-3-1-pro-vs-gpt-6-astra)

## Explore More

- [Claude Opus 4.8 profile](/models/claude-opus-4-8)
- [Gemini 3.1 Pro profile](/models/gemini-3-1-pro)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)