# GPT-5.4 Pro vs Qwen3.5 Flash

> Side-by-side benchmark comparison for GPT-5.4 Pro and Qwen3.5 Flash across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gpt-5-4-pro-vs-qwen3-5-flash
- Last updated: September 18, 2026

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

## Quick Verdict

Evidence is too thin for a benchmark verdict: GPT-5.4 Pro and Qwen3.5 Flash 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.
- Qwen3.5 Flash has the lower published output-token price.
- GPT-5.4 Pro has the larger published context window at 1.05M.

## Model Snapshot

| Property | GPT-5.4 Pro | Qwen3.5 Flash |
|----------|----------|----------|
| Creator | OpenAI | Alibaba |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 1.05M | 1M |
| Independent public score (not head-to-head) | 60.49 | 56.19 |
| Benchmarks Covered | 10 | 2 |
| Pricing (input/output) | $30.00 / $180.00 | $0.10 / $0.40 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- GPT-5.4 Pro public-lane score: 56.4 (Estimated · #35/154)
- Qwen3.5 Flash public-lane score: Coming soon

| Benchmark | GPT-5.4 Pro | Qwen3.5 Flash | Winner |
|-----------|-----------|-----------|--------|
| BrowseComp | 89.3% | Coming soon | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- GPT-5.4 Pro public-lane score: Coming soon
- Qwen3.5 Flash public-lane score: 46.8 (Estimated · #82/154)

### Reasoning

- Winner: Insufficient shared evidence
- GPT-5.4 Pro public-lane score: 70.2 (Unranked · 2 rankable rows)
- Qwen3.5 Flash public-lane score: Coming soon

| Benchmark | GPT-5.4 Pro | Qwen3.5 Flash | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-2 | 83.3% | Coming soon | Coming soon |

### Knowledge

- Winner: Insufficient shared evidence
- GPT-5.4 Pro public-lane score: 59 (Estimated · #39/184)
- Qwen3.5 Flash public-lane score: Coming soon

| Benchmark | GPT-5.4 Pro | Qwen3.5 Flash | Winner |
|-----------|-----------|-----------|--------|
| HLE | 58.7% | Coming soon | Coming soon |
| FrontierScience | 36.7% | Coming soon | Coming soon |
| FrontierScience Research | 36.7% | Coming soon | Coming soon |
| HLE w/o tools | 42.7% | Coming soon | Coming soon |

### Mathematics

- Winner: Insufficient shared evidence
- GPT-5.4 Pro public-lane score: 68.8 (Unranked · 4 rankable rows)
- Qwen3.5 Flash public-lane score: 28.4 (Unranked · 2 rankable rows)

| Benchmark | GPT-5.4 Pro | Qwen3.5 Flash | Winner |
|-----------|-----------|-----------|--------|
| IPhO 2025 (Theory) | 93.5% | Coming soon | Coming soon |
| FrontierMath (legacy) | 50% | Coming soon | Coming soon |
| FrontierMath v2 (Tiers 1-3) | 50.000% | 6.207% | GPT-5.4 Pro |
| FrontierMath v2 (Tier 4) | 37.500% | 0.000% | GPT-5.4 Pro |

## FAQ

### Is there enough evidence to pick between GPT-5.4 Pro and Qwen3.5 Flash?

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

- [GPT-5.4 Pro vs GPT-5.4](/compare/gpt-5-4-vs-gpt-5-4-pro)
- [Qwen3.5 Flash vs GPT-5.4](/compare/gpt-5-4-vs-qwen3-5-flash)
- [GPT-5.4 Pro vs GPT-5.4 mini](/compare/gpt-5-4-mini-vs-gpt-5-4-pro)
- [Qwen3.5 Flash vs GPT-5.4 mini](/compare/gpt-5-4-mini-vs-qwen3-5-flash)

## Explore More

- [GPT-5.4 Pro profile](/models/gpt-5-4-pro)
- [Qwen3.5 Flash profile](/models/qwen3-5-flash)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)