# GPT-5.3 Codex vs Qwen3.5 397B

> Side-by-side benchmark comparison for GPT-5.3 Codex and Qwen3.5 397B across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gpt-5-3-codex-vs-qwen3-5-397b
- Last updated: October 17, 2026

- Shared sourced benchmarks: 6
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

GPT-5.3 Codex leads by point estimate. Conditional score ranges do not establish rank confidence. Choose using the category evidence and your own workload tests.

## Summary

- GPT-5.3 Codex has the higher overall point estimate 60.48 to 55.34. Conditional score ranges do not establish rank confidence.
- The clearest category separation is in instruction following, where the averages are 92.6 for GPT-5.3 Codex and 79.9 for Qwen3.5 397B.
- The biggest single benchmark swing is Terminal-Bench 2.0 in Agentic, with scores of 77.3% and 52.5%.
- Qwen3.5 397B is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.
- GPT-5.3 Codex also has the larger context window at 400K.

## Model Snapshot

| Property | GPT-5.3 Codex | Qwen3.5 397B |
|----------|----------|----------|
| Creator | OpenAI | Alibaba |
| Type | Proprietary | Open Weight |
| Reasoning | Reasoning | Non-Reasoning |
| Context | 400K | 128K |
| Overall Score | 60.48 | 55.34 |
| Benchmarks Covered | 11 | 62 |
| Pricing (input/output) | $1.75 / $14.00 | $0.60 / $3.60 |

## Category Breakdown

### Agentic

- Winner: Directional only
- GPT-5.3 Codex public-lane score: 55.5 (Estimated · #41/128)
- Qwen3.5 397B public-lane score: 43.8 (Estimated · #61/128)

| Benchmark | GPT-5.3 Codex | Qwen3.5 397B | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.0 | 77.3% | 52.5% | GPT-5.3 Codex |
| OSWorld-Verified | 64.7% | 62.2% | GPT-5.3 Codex |
| Gert Labs | 57.47% | 46.76% | GPT-5.3 Codex |
| JobBench | 33.7% | Coming soon | Coming soon |
| BrowseComp | Coming soon | 69% | Coming soon |
| Claw-Eval | Coming soon | 56.8% | Coming soon |
| QwenClawBench | Coming soon | 51.8% | Coming soon |
| τ³-bench results | Coming soon | 68.4% | Coming soon |
| VITA-Bench | Coming soon | 43.7% | Coming soon |
| DeepPlanning | Coming soon | 37.6% | Coming soon |
| Toolathlon | Coming soon | 36.3% | Coming soon |
| MCP Atlas | Coming soon | 46.1% | Coming soon |
| MCP-Tasks | Coming soon | 74.2% | Coming soon |
| WideResearch | Coming soon | 74.0% | Coming soon |
| ResearchClawBench | Coming soon | 14.2% | Coming soon |

### Coding

- Winner: Not comparable
- GPT-5.3 Codex public-lane score: 53.5 (Supported · #35/150)
- Qwen3.5 397B public-lane score: Coming soon

| Benchmark | GPT-5.3 Codex | Qwen3.5 397B | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 85% | 76.2% | GPT-5.3 Codex |
| SWE-bench Pro | 56.8% | 50.9% | GPT-5.3 Codex |
| SWE-Rebench | 58.2% | Coming soon | Coming soon |
| Terminal-Bench 2.0 | 77.3% | 52.5% | GPT-5.3 Codex |
| Vibe Code Bench | 61.77% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | 87.3% | Coming soon | Coming soon |
| SWE-bench (Vals) | 78.0% | Coming soon | Coming soon |
| LiveCodeBench v6 | Coming soon | 83.6% | Coming soon |
| SWE Multilingual | Coming soon | 69.3% | Coming soon |
| NL2Repo | Coming soon | 32.2% | Coming soon |

### Reasoning

- Winner: Not comparable
- GPT-5.3 Codex public-lane score: 83.1 (Unranked · 2 rankable rows)
- Qwen3.5 397B public-lane score: 74.9 (Unranked · 2 rankable rows)

| Benchmark | GPT-5.3 Codex | Qwen3.5 397B | Winner |
|-----------|-----------|-----------|--------|
| LongBench v2 | Coming soon | 63.2% | Coming soon |
| AI-Needle | Coming soon | 68.7% | Coming soon |

### Multimodal & Grounded

- Winner: Not comparable
- GPT-5.3 Codex public-lane score: 80.1 (Unranked · 1 rankable row)
- Qwen3.5 397B public-lane score: 73.6 (#29/54)

| Benchmark | GPT-5.3 Codex | Qwen3.5 397B | Winner |
|-----------|-----------|-----------|--------|
| MMMU | Coming soon | 85.0% | Coming soon |
| MMMU-Pro | Coming soon | 79% | Coming soon |
| RealWorldQA | Coming soon | 83.9% | Coming soon |
| OmniDocBench 1.5 | Coming soon | 90.8% | Coming soon |
| Video-MME (with subtitle) | Coming soon | 87.5% | Coming soon |
| Video-MME (w/o subtitle) | Coming soon | 83.7% | Coming soon |
| MathVision | Coming soon | 88.6% | Coming soon |
| We-Math | Coming soon | 87.9% | Coming soon |
| DynaMath | Coming soon | 86.3% | Coming soon |
| SimpleVQA | Coming soon | 67.1% | Coming soon |
| CharXiv | Coming soon | 80.8% | Coming soon |
| MMLongBench-Doc | Coming soon | 61.5% | Coming soon |
| CC-OCR | Coming soon | 82.0% | Coming soon |
| AI2D_TEST | Coming soon | 93.9% | Coming soon |
| CountBench | Coming soon | 97.2% | Coming soon |
| RefCOCO (avg) | Coming soon | 92.3% | Coming soon |
| ODINW13 | Coming soon | 47.0% | Coming soon |
| ERQA | Coming soon | 67.5% | Coming soon |
| VideoMMMU | Coming soon | 84.7% | Coming soon |
| MLVU (M-Avg) | Coming soon | 86.7% | Coming soon |
| ScreenSpot Pro | Coming soon | 65.6% | Coming soon |
| V* | Coming soon | 95.8% | Coming soon |

### Knowledge

- Winner: Directional only
- GPT-5.3 Codex public-lane score: 65.4 (Estimated · #33/184)
- Qwen3.5 397B public-lane score: 53.1 (Estimated · #68/184)

| Benchmark | GPT-5.3 Codex | Qwen3.5 397B | Winner |
|-----------|-----------|-----------|--------|
| GPQA | Coming soon | 88.4% | Coming soon |
| SuperGPQA | Coming soon | 70.4% | Coming soon |
| MMLU-Pro | Coming soon | 87.8% | Coming soon |
| MMLU-Redux | Coming soon | 94.9% | Coming soon |
| C-Eval | Coming soon | 93% | Coming soon |
| HLE | Coming soon | 28.7% | Coming soon |

### Multilingual

- Winner: Not comparable
- GPT-5.3 Codex public-lane score: Coming soon
- Qwen3.5 397B public-lane score: 93.8 (#5/17)

| Benchmark | GPT-5.3 Codex | Qwen3.5 397B | Winner |
|-----------|-----------|-----------|--------|
| MMLU-ProX | Coming soon | 84.7% | Coming soon |
| NOVA-63 | Coming soon | 59.1% | Coming soon |
| INCLUDE | Coming soon | 85.6% | Coming soon |
| PolyMath | Coming soon | 73.3% | Coming soon |
| MAXIFE | Coming soon | 88.2% | Coming soon |

### Instruction Following

- Winner: Directional only
- GPT-5.3 Codex public-lane score: 92.6 (#18/148)
- Qwen3.5 397B public-lane score: 79.9 (#59/148)

| Benchmark | GPT-5.3 Codex | Qwen3.5 397B | Winner |
|-----------|-----------|-----------|--------|
| IFEval | Coming soon | 92.6% | Coming soon |
| IFBench | Coming soon | 76.5% | Coming soon |

### Mathematics

- Winner: Not comparable
- GPT-5.3 Codex public-lane score: Coming soon
- Qwen3.5 397B public-lane score: 81.7 (Unranked · 5 rankable rows)

| Benchmark | GPT-5.3 Codex | Qwen3.5 397B | Winner |
|-----------|-----------|-----------|--------|
| AIME26 | Coming soon | 93.3% | Coming soon |
| HMMT Feb 2025 | Coming soon | 94.8% | Coming soon |
| HMMT Nov 2025 | Coming soon | 92.7% | Coming soon |
| HMMT Feb 2026 | Coming soon | 87.9% | Coming soon |
| MMAnswerBench | Coming soon | 80.9% | Coming soon |

## FAQ

### Which is better overall, GPT-5.3 Codex or Qwen3.5 397B?

GPT-5.3 Codex has the higher overall point estimate. Conditional score ranges do not establish rank confidence.

### Where is the biggest gap between GPT-5.3 Codex and Qwen3.5 397B?

The widest category gap is in instruction following, where the averages are 92.6 for GPT-5.3 Codex and 79.9 for Qwen3.5 397B.

### How many benchmarks does GPT-5.3 Codex cover on BenchLM?

GPT-5.3 Codex currently has 11 sourced benchmark scores on BenchLM.

### How many benchmarks does Qwen3.5 397B cover on BenchLM?

Qwen3.5 397B currently has 62 sourced benchmark scores on BenchLM.

## Related Comparisons

- [GPT-5.3 Codex vs GPT-5.3-Codex-Spark](/compare/gpt-5-3-codex-vs-gpt-5-3-codex-spark)
- [Qwen3.5 397B vs GPT-5.3-Codex-Spark](/compare/gpt-5-3-codex-spark-vs-qwen3-5-397b)
- [GPT-5.3 Codex vs Qwen3.5 397B (Reasoning)](/compare/gpt-5-3-codex-vs-qwen3-5-397b-reasoning)
- [Qwen3.5 397B vs Qwen3.5 397B (Reasoning)](/compare/qwen3-5-397b-vs-qwen3-5-397b-reasoning)

## Explore More

- [GPT-5.3 Codex profile](/models/gpt-5-3-codex)
- [Qwen3.5 397B profile](/models/qwen3-5-397b)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)