Deepseek v4 Pro vs GPT-5.3-Codex
Deepseek v4 Pro 
GPT-5.3-Codex Verdict
- Deepseek v4 Pro (high) and GPT-5.3-Codex are level on quality (60.4 vs 60.6).
- Deepseek v4 Pro (high) is stronger in coding, human preference, maths, reasoning.
- GPT-5.3-Codex is stronger in agents & tools, composite, instruction following, knowledge, long context, multimodal.
| Metric | Deepseek v4 Pro (high) | GPT-5.3-Codex |
|---|---|---|
| BenchLeader Index | 60.4 | 60.6 |
| Coding score | 59.3 | 54.7 |
| Human preference score | 66.0 | – |
| Maths score | 66.2 | – |
| Reasoning score | 65.9 | – |
| Agents & tools score | – | 61.7 |
| Composite score | – | 64.0 |
| Instruction following score | – | 70.1 |
| Knowledge score | – | 65.9 |
| Long context score | – | 66.0 |
| Multimodal score | – | 61.6 |
| Blended price $/M | – | $4.81 |
| Output speed | – | 124 tok/s |
| Time to first answer | – | 48.3 s |
| Context window | – | 400k |
| GPQA Diamond | 90.9% | – |
| OTIS Mock AIME | 95.6% | – |
| Terminal-Bench | – | 78.4% |
| SciCode | 46.4% | – |
| WeirdML | 46.5% | 79.3% |
| APEX-Agents | – | 31.8% |
| Epoch Capabilities Index | – | 156.6 |
| LMArena Text | 1462 | – |
| LMArena Hard Prompts | 1482 | – |
| LMArena Coding | 1505 | – |
| LMArena WebDev | 1581 | 1409 |
| AA Intelligence Index | – | 32.5 |
| IFBench | – | 75.4% |
| AA-LCR | – | 83.3% |
| MMMU-Pro | – | 78.5% |
| AA-Omniscience | – | 10.9 |
| Terminal-Bench Hard | – | 53.0% |
| GPQA Diamond (AA) | – | 91.5% |
| Humanity's Last Exam (AA) | – | 42.5% |
| τ²-Bench Telecom (AA) | – | 86.0% |
| HiL-Bench | – | 4.3% |
Data as of 2026-09-13. Best configuration of each model; every score links to its source on the model pages.
Deepseek v4 Pro vs GPT-5.3-Codex: questions
- Is Deepseek v4 Pro better than GPT-5.3-Codex?
- Deepseek v4 Pro (high) and GPT-5.3-Codex are level on quality (60.4 vs 60.6). The BenchLeader Index combines every independent quality benchmark; GPT-5.3-Codex is ahead overall as of 2026-09-13, but check the category scores for your use.
- Is Deepseek v4 Pro better than GPT-5.3-Codex for coding?
- Deepseek v4 Pro scores higher in coding (59 vs 55 on the category index, where 50 is average).