# Claude Opus 4.8 vs DeepSeek V3.1 (Reasoning)

> Side-by-side benchmark comparison for Claude Opus 4.8 and DeepSeek V3.1 (Reasoning) across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/claude-opus-4-8-vs-deepseek-v3-1-reasoning
- Last updated: October 10, 2026

- Shared sourced benchmarks: 2
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Evidence is too thin for a benchmark verdict: Claude Opus 4.8 and DeepSeek V3.1 (Reasoning) share only 2 sourced benchmark rows.

## Summary

- Only 2 shared sourced benchmark rows are available. That is not enough for a broad capability verdict, so this mirror does not name an overall winner.
- DeepSeek V3.1 (Reasoning) has the lower published output-token price.
- Claude Opus 4.8 has the larger published context window at 1M.

## Model Snapshot

| Property | Claude Opus 4.8 | DeepSeek V3.1 (Reasoning) |
|----------|----------|----------|
| Creator | Anthropic | DeepSeek |
| Type | Proprietary | Open Weight |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | 128K |
| Independent public score (not head-to-head) | 69.12 | 38.9 |
| Benchmarks Covered | 40 | 6 |
| Pricing (input/output) | $5.00 / $25.00 | $0.00 / $0.00 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Claude Opus 4.8 public-lane score: 61.6 (Supported · #20/123)
- DeepSeek V3.1 (Reasoning) public-lane score: Coming soon

| Benchmark | Claude Opus 4.8 | DeepSeek V3.1 (Reasoning) | 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% | 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% | Coming soon | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- Claude Opus 4.8 public-lane score: 60.8 (Supported · #19/146)
- DeepSeek V3.1 (Reasoning) public-lane score: Coming soon

| Benchmark | Claude Opus 4.8 | DeepSeek V3.1 (Reasoning) | 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% | Coming soon | Coming soon |
| SWE-bench (Vals) | 88.6% | Coming soon | Coming soon |
| PostTrainBench v1.1 | 32.9% | Coming soon | Coming soon |
| LiveCodeBench | Coming soon | 74.8% | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- Claude Opus 4.8 public-lane score: 62.9 (#24/28)
- DeepSeek V3.1 (Reasoning) public-lane score: 65 (Unranked · 2 rankable rows)

| Benchmark | Claude Opus 4.8 | DeepSeek V3.1 (Reasoning) | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-2 | 72.1% | Coming soon | Coming soon |
| ARC-AGI-3 | 1.5% | Coming soon | Coming soon |
| ARC-AGI-1 | 92.50% | Coming soon | Coming soon |

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- Claude Opus 4.8 public-lane score: 91.2 (#5/54)
- DeepSeek V3.1 (Reasoning) public-lane score: Coming soon

| Benchmark | Claude Opus 4.8 | DeepSeek V3.1 (Reasoning) | 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: Insufficient shared evidence
- Claude Opus 4.8 public-lane score: 70.7 (Supported · #14/177)
- DeepSeek V3.1 (Reasoning) public-lane score: 40.6 (Supported · #109/177)

| Benchmark | Claude Opus 4.8 | DeepSeek V3.1 (Reasoning) | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 93.6% | 80.1% | Claude Opus 4.8 |
| GPQA-D | 93.6% | Coming soon | Coming soon |
| HLE | 57.9% | 15.9% | Claude Opus 4.8 |
| HLE w/o tools | 49.8% | Coming soon | Coming soon |
| GPQA Diamond (Vals) | 92.4% | Coming soon | Coming soon |
| MMLU-Pro (Vals) | 89.6% | Coming soon | Coming soon |
| MMLU-Pro | Coming soon | 84.8% | Coming soon |

### Multilingual

- Winner: Insufficient shared evidence
- Claude Opus 4.8 public-lane score: Coming soon
- DeepSeek V3.1 (Reasoning) public-lane score: Coming soon

| Benchmark | Claude Opus 4.8 | DeepSeek V3.1 (Reasoning) | Winner |
|-----------|-----------|-----------|--------|
| INCLUDE | 87.6% | Coming soon | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- Claude Opus 4.8 public-lane score: 75.4 (#61/127)
- DeepSeek V3.1 (Reasoning) public-lane score: 48.4 (#84/127)

### Mathematics

- Winner: Insufficient shared evidence
- Claude Opus 4.8 public-lane score: 65.7 (#2/7)
- DeepSeek V3.1 (Reasoning) public-lane score: Coming soon

| Benchmark | Claude Opus 4.8 | DeepSeek V3.1 (Reasoning) | 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 |
| AIME 2024 | Coming soon | 93.1% | Coming soon |
| AIME 2025 | Coming soon | 88.4% | Coming soon |

## FAQ

### Is there enough evidence to pick between Claude Opus 4.8 and DeepSeek V3.1 (Reasoning)?

Not yet. The models share only 2 sourced benchmark rows, so this mirror reports the available measurements and metadata without naming a broad winner.

### What can I compare safely on this page?

Published pricing, context windows, model type, and individual shared benchmark rows are directly comparable. Independent overall scores and non-overlapping benchmark coverage are labeled separately and should not be read as a controlled head-to-head result.

## Related Comparisons

- [Claude Opus 4.8 vs DeepSeek V3.1](/compare/claude-opus-4-8-vs-deepseek-v3-1)
- [DeepSeek V3.1 (Reasoning) vs DeepSeek V3.1](/compare/deepseek-v3-1-vs-deepseek-v3-1-reasoning)
- [Claude Opus 4.8 vs Claude Opus 5.5](/compare/claude-opus-4-8-vs-claude-opus-5-5)
- [DeepSeek V3.1 (Reasoning) vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-deepseek-v3-1-reasoning)

## Explore More

- [Claude Opus 4.8 profile](/models/claude-opus-4-8)
- [DeepSeek V3.1 (Reasoning) profile](/models/deepseek-v3-1-reasoning)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)