# o3 vs Qwen3.5 Flash

> Side-by-side benchmark comparison for o3 and Qwen3.5 Flash across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/o3-vs-qwen3-5-flash
- Last updated: September 29, 2026

- Shared sourced benchmarks: 2
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.7

## Quick Verdict

Evidence is too thin for a benchmark verdict: o3 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.
- Qwen3.5 Flash has the larger published context window at 1M.

## Model Snapshot

| Property | o3 | Qwen3.5 Flash |
|----------|----------|----------|
| Creator | OpenAI | Alibaba |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 200K | 1M |
| Independent public score (not head-to-head) | 46.95 | 45.47 |
| Benchmarks Covered | 2 | 6 |
| Pricing (input/output) | $2.00 / $8.00 | $0.10 / $0.40 |

## Category Breakdown

### Coding

- Winner: Insufficient shared evidence
- o3 public-lane score: Coming soon
- Qwen3.5 Flash public-lane score: 26.5 (Estimated · #103/143)

| Benchmark | o3 | Qwen3.5 Flash | Winner |
|-----------|-----------|-----------|--------|
| LiveCodeBench (Vals) | Coming soon | 83.3% | Coming soon |
| SWE-bench (Vals) | Coming soon | 64.4% | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- o3 public-lane score: 73.7 (Unranked · 2 rankable rows)
- Qwen3.5 Flash public-lane score: Coming soon

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- o3 public-lane score: 64.4 (Unranked · 1 rankable row)
- Qwen3.5 Flash public-lane score: Coming soon

### Knowledge

- Winner: Insufficient shared evidence
- o3 public-lane score: 47.1 (Estimated · #74/169)
- Qwen3.5 Flash public-lane score: 43.1 (Estimated · #85/169)

| Benchmark | o3 | Qwen3.5 Flash | Winner |
|-----------|-----------|-----------|--------|
| GPQA Diamond (Vals) | Coming soon | 82.8% | Coming soon |
| MMLU-Pro (Vals) | Coming soon | 84.1% | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- o3 public-lane score: 86 (#34/124)
- Qwen3.5 Flash public-lane score: Coming soon

### Mathematics

- Winner: Insufficient shared evidence
- o3 public-lane score: 37.7 (Unranked · 2 rankable rows)
- Qwen3.5 Flash public-lane score: 28.4 (Unranked · 2 rankable rows)

| Benchmark | o3 | Qwen3.5 Flash | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath v2 (Tiers 1-3) | 18.685% | 6.207% | o3 |
| FrontierMath v2 (Tier 4) | 2.083% | 0.000% | o3 |

## FAQ

### Is there enough evidence to pick between o3 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

- [o3 vs o3-pro](/compare/o3-vs-o3-pro)
- [Qwen3.5 Flash vs o3-pro](/compare/o3-pro-vs-qwen3-5-flash)
- [o3 vs o3-mini](/compare/o3-vs-o3-mini)
- [Qwen3.5 Flash vs o3-mini](/compare/o3-mini-vs-qwen3-5-flash)

## Explore More

- [o3 profile](/models/o3)
- [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)