GPT-5.3-Codex vs Qwen3 8
GPT-5.3-Codex 
Qwen3 8 Verdict
- Qwen3 8 (max) leads on quality: 63.6 vs 62.5.
- GPT-5.3-Codex is stronger in agents & tools, instruction following, knowledge, long context.
- Qwen3 8 (max) is stronger in coding, composite, multimodal, human preference, maths, reasoning.
- Qwen3 8 (max) is 1.8× cheaper ($2.67 vs $4.81 per 1M blended).
- GPT-5.3-Codex streams 3.2× faster (121 vs 38 tokens per second).
| Metric | GPT-5.3-Codex | Qwen3 8 (max) |
|---|---|---|
| BenchLeader Index | 62.5 | 63.6 |
| Agents & tools score | 62.7 | 56.0 |
| Coding score | 54.8 | 69.7 |
| Composite score | 70.1 | 70.9 |
| Instruction following score | 73.2 | – |
| Knowledge score | 69.3 | 62.3 |
| Long context score | 68.3 | 65.7 |
| Multimodal score | 63.0 | 67.2 |
| Human preference score | – | 68.3 |
| Maths score | – | 62.4 |
| Reasoning score | – | 68.1 |
| Blended price $/M | $4.81 | $2.67 |
| Output speed | 121 tok/s | 38 tok/s |
| Time to first answer | 58.2 s | 55.3 s |
| Context window | 400k | 1M |
| Terminal-Bench | 78.4% | – |
| SciCode | – | 52.9% |
| WeirdML | 79.3% | – |
| APEX-Agents | 31.8% | – |
| ProofBench | – | 58.0% |
| Epoch Capabilities Index | 156.6 | 156.6 |
| LMArena Text | – | 1480 |
| LMArena Hard Prompts | – | 1502 |
| LMArena Coding | – | 1520 |
| LMArena WebDev | 1409 | 1670 |
| LMArena Vision | – | 1313 |
| LMArena Agent | – | 3.9 |
| LiveBench | – | 78.5% |
| LiveBench Reasoning | – | 88.2% |
| LiveBench Coding | – | 72.9% |
| LiveBench Agentic Coding | – | 64.7% |
| LiveBench Mathematics | – | 91.3% |
| LiveBench Data Analysis | – | 78.4% |
| LiveBench Language | – | 79.7% |
| AA Intelligence Index | 32.5 | 40.3 |
| IFBench | 75.4% | – |
| AA-LCR | 83.3% | 78.3% |
| MMMU-Pro | 78.5% | 82.3% |
| AA-Omniscience | 10.9 | 3.4 |
| Terminal-Bench Hard | 53.0% | – |
| GPQA Diamond (AA) | 91.5% | 92.7% |
| Humanity's Last Exam (AA) | 42.5% | 43.0% |
| SciCode (AA) | – | 53.2% |
| τ²-Bench Telecom (AA) | 86.0% | – |
| LiveCodeBench | – | 87.8% |
| MMLU-Pro | – | 88.6% |
| IOI | – | 73.0% |
| LegalBench | – | 83.6% |
| CorpFin | – | 65.8% |
| TaxEval | – | 75.5% |
| Terminal-Bench 2.1 (Vals) | – | 67.4% |
| SWE-bench (Vals) | – | 85.6% |
| GPQA Diamond (Vals) | – | 93.7% |
| Vals Index | – | 51.8 |
| 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 8: questions
- Is GPT-5.3-Codex better than Qwen3 8?
- Qwen3 8 (max) leads on quality: 63.6 vs 62.5. The BenchLeader Index combines every independent quality benchmark; Qwen3 8 (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 8 for coding?
- Qwen3 8 scores higher in coding (70 vs 55 on the category index, where 50 is average).
- Is GPT-5.3-Codex better than Qwen3 8 for agentic tasks?
- GPT-5.3-Codex scores higher in agentic tasks (63 vs 56 on the category index, where 50 is average).
- Which is cheaper, GPT-5.3-Codex or Qwen3 8?
- Qwen3 8 is cheaper: $2.67 against $4.81 per million tokens, blended at three input tokens per output token.
- Which is faster, GPT-5.3-Codex or Qwen3 8?
- GPT-5.3-Codex streams faster: 121 against 38 output tokens per second.
- Which has the larger context window?
- Qwen3 8 accepts more context: 1M against 400k tokens.