GPT-5.3-Codex vs Qwen3 6
GPT-5.3-Codex 
Qwen3 6 Verdict
- GPT-5.3-Codex and Qwen3 6 (max) are level on quality (62.5 vs 63.3).
- GPT-5.3-Codex is stronger in composite, knowledge, long context, multimodal.
- Qwen3 6 (max) is stronger in agents & tools, coding, instruction following, human preference, maths, reasoning.
- Qwen3 6 (max) is 1.6× cheaper ($2.96 vs $4.81 per 1M blended).
- GPT-5.3-Codex streams 2.1× faster (121 vs 59 tokens per second).
| Metric | GPT-5.3-Codex | Qwen3 6 (max) |
|---|---|---|
| BenchLeader Index | 62.5 | 63.3 |
| Agents & tools score | 62.7 | 72.0 |
| Coding score | 54.8 | 58.2 |
| Composite score | 70.1 | 64.9 |
| Instruction following score | 73.2 | 74.2 |
| Knowledge score | 69.3 | 64.0 |
| Long context score | 68.3 | 66.9 |
| Multimodal score | 63.0 | – |
| Human preference score | – | 65.9 |
| Maths score | – | 64.2 |
| Reasoning score | – | 63.2 |
| Blended price $/M | $4.81 | $2.96 |
| Output speed | 121 tok/s | 59 tok/s |
| Time to first answer | 58.2 s | 38.5 s |
| Context window | 400k | 246k |
| GPQA Diamond | – | 87.4% |
| OTIS Mock AIME | – | 91.1% |
| SWE-bench Verified (Epoch) | – | 76.7% |
| SimpleQA Verified | – | 52.0% |
| Terminal-Bench | 78.4% | – |
| SimpleBench | – | 63.0% |
| WeirdML | 79.3% | – |
| APEX-Agents | 31.8% | – |
| Epoch Capabilities Index | 156.6 | 149.3 |
| LMArena Text | – | 1460 |
| LMArena Hard Prompts | – | 1482 |
| LMArena Coding | – | 1509 |
| LMArena WebDev | 1409 | 1479 |
| AA Intelligence Index | 32.5 | 28.4 |
| IFBench | 75.4% | 76.6% |
| AA-LCR | 83.3% | 80.7% |
| MMMU-Pro | 78.5% | – |
| AA-Omniscience | 10.9 | 9.2 |
| Terminal-Bench Hard | 53.0% | 43.9% |
| GPQA Diamond (AA) | 91.5% | 88.8% |
| Humanity's Last Exam (AA) | 42.5% | 30.8% |
| τ²-Bench Telecom (AA) | 86.0% | 95.9% |
| CorpFin | – | 66.5% |
| SWE-bench (Vals) | – | 72.8% |
| HiL-Bench | 4.3% | – |
Data as of 2026-09-10. Best configuration of each model; every score links to its source on the model pages.
GPT-5.3-Codex vs Qwen3 6: questions
- Is GPT-5.3-Codex better than Qwen3 6?
- GPT-5.3-Codex and Qwen3 6 (max) are level on quality (62.5 vs 63.3). The BenchLeader Index combines every independent quality benchmark; Qwen3 6 (max) is ahead overall as of 2026-09-10, but check the category scores for your use.
- Is GPT-5.3-Codex better than Qwen3 6 for coding?
- Qwen3 6 scores higher in coding (58 vs 55 on the category index, where 50 is average).
- Is GPT-5.3-Codex better than Qwen3 6 for agentic tasks?
- Qwen3 6 scores higher in agentic tasks (72 vs 63 on the category index, where 50 is average).
- Which is cheaper, GPT-5.3-Codex or Qwen3 6?
- Qwen3 6 is cheaper: $2.96 against $4.81 per million tokens, blended at three input tokens per output token.
- Which is faster, GPT-5.3-Codex or Qwen3 6?
- GPT-5.3-Codex streams faster: 121 against 59 output tokens per second.
- Which has the larger context window?
- GPT-5.3-Codex accepts more context: 400k against 246k tokens.