# DeepSeek V3 vs GPT-5.5 Pro

> Side-by-side benchmark comparison for DeepSeek V3 and GPT-5.5 Pro across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/deepseek-v3-vs-gpt-5-5-pro
- Last updated: September 29, 2026

- Shared sourced benchmarks: 1
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.7

## Quick Verdict

Evidence is too thin for a benchmark verdict: DeepSeek V3 and GPT-5.5 Pro share only 1 sourced benchmark row.

## Summary

- Only 1 shared sourced benchmark row is available. That is not enough for a broad capability verdict, so this mirror does not name an overall winner.
- DeepSeek V3 has the lower published output-token price.
- GPT-5.5 Pro has the larger published context window at 1M.

## Model Snapshot

| Property | DeepSeek V3 | GPT-5.5 Pro |
|----------|----------|----------|
| Creator | DeepSeek | OpenAI |
| Type | Open Weight | Proprietary |
| Reasoning | Non-Reasoning | Reasoning |
| Context | 128K | 1M |
| Independent public score (not head-to-head) | 31.86 | 72.18 |
| Benchmarks Covered | 6 | 8 |
| Pricing (input/output) | $0.27 / $1.10 | $30.00 / $180.00 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- DeepSeek V3 public-lane score: 12.1 (Estimated · #113/117)
- GPT-5.5 Pro public-lane score: Coming soon

| Benchmark | DeepSeek V3 | GPT-5.5 Pro | Winner |
|-----------|-----------|-----------|--------|
| BrowseComp | Coming soon | 90.1% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- DeepSeek V3 public-lane score: 18.6 (Estimated · #131/143)
- GPT-5.5 Pro public-lane score: Coming soon

| Benchmark | DeepSeek V3 | GPT-5.5 Pro | Winner |
|-----------|-----------|-----------|--------|
| LiveCodeBench | 37.6% | Coming soon | Coming soon |
| SWE-bench Verified | 42% | Coming soon | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- DeepSeek V3 public-lane score: 42.3 (Unranked · 2 rankable rows)
- GPT-5.5 Pro public-lane score: 75.1 (Unranked · 3 rankable rows)

| Benchmark | DeepSeek V3 | GPT-5.5 Pro | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-1 | Coming soon | 95.00% | Coming soon |
| ARC-AGI-2 | Coming soon | 84.2% | Coming soon |

### Knowledge

- Winner: Insufficient shared evidence
- DeepSeek V3 public-lane score: 30.2 (Estimated · #140/169)
- GPT-5.5 Pro public-lane score: Coming soon

| Benchmark | DeepSeek V3 | GPT-5.5 Pro | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 59.1% | Coming soon | Coming soon |
| MMLU-Pro | 75.9% | Coming soon | Coming soon |
| HLE | Coming soon | 57.2% | Coming soon |
| HLE w/o tools | Coming soon | 43.1% | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- DeepSeek V3 public-lane score: 38.2 (#103/124)
- GPT-5.5 Pro public-lane score: Coming soon

| Benchmark | DeepSeek V3 | GPT-5.5 Pro | Winner |
|-----------|-----------|-----------|--------|
| IFEval | 86.1% | Coming soon | Coming soon |

### Mathematics

- Winner: Insufficient shared evidence
- DeepSeek V3 public-lane score: 26 (Unranked · 1 rankable row)
- GPT-5.5 Pro public-lane score: 70.1 (Unranked · 3 rankable rows)

| Benchmark | DeepSeek V3 | GPT-5.5 Pro | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath v2 (Tiers 1-3) | 1.724% | 51.000% | GPT-5.5 Pro |
| FrontierMath (legacy) | Coming soon | 52.4% | Coming soon |
| FrontierMath v2 (Tier 4) | Coming soon | 39.600% | Coming soon |

## FAQ

### Is there enough evidence to pick between DeepSeek V3 and GPT-5.5 Pro?

Not yet. The models share only 1 sourced benchmark row, 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

- [DeepSeek V3 vs GPT-5.5](/compare/deepseek-v3-vs-gpt-5-5)
- [GPT-5.5 Pro vs GPT-5.5](/compare/gpt-5-5-vs-gpt-5-5-pro)
- [DeepSeek V3 vs GPT-6 Astra](/compare/deepseek-v3-vs-gpt-6-astra)
- [GPT-5.5 Pro vs GPT-6 Astra](/compare/gpt-5-5-pro-vs-gpt-6-astra)

## Explore More

- [DeepSeek V3 profile](/models/deepseek-v3)
- [GPT-5.5 Pro profile](/models/gpt-5-5-pro)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)