GPT-5.3-Codex vs Mimo v2 Pro
GPT-5.3-Codex 
Mimo v2 Pro Verdict
- GPT-5.3-Codex leads on quality: 62.5 vs 60.6.
- GPT-5.3-Codex is stronger in coding, composite, instruction following, knowledge, long context, multimodal.
- Mimo v2 Pro is stronger in agents & tools, human preference, reasoning.
- Mimo v2 Pro is 1.6× cheaper ($3.00 vs $4.81 per 1M blended).
| Metric | GPT-5.3-Codex | Mimo v2 Pro |
|---|---|---|
| BenchLeader Index | 62.5 | 60.6 |
| Agents & tools score | 62.7 | 69.4 |
| Coding score | 54.8 | 54.7 |
| Composite score | 70.1 | 65.2 |
| Instruction following score | 73.2 | 67.5 |
| Knowledge score | 69.3 | 66.3 |
| Long context score | 68.3 | 60.5 |
| Multimodal score | 63.0 | – |
| Human preference score | – | 64.5 |
| Reasoning score | – | 65.2 |
| Blended price $/M | $4.81 | $3.00 |
| Output speed | 121 tok/s | – |
| Time to first answer | 58.2 s | – |
| Context window | 400k | 1.0M |
| Terminal-Bench | 78.4% | – |
| WeirdML | 79.3% | – |
| APEX-Agents | 31.8% | – |
| Epoch Capabilities Index | 156.6 | – |
| LMArena Text | – | 1448 |
| LMArena Hard Prompts | – | 1476 |
| LMArena Coding | – | 1503 |
| LMArena WebDev | 1409 | 1433 |
| AA Intelligence Index | 32.5 | 28.6 |
| IFBench | 75.4% | 68.8% |
| AA-LCR | 83.3% | 68.3% |
| MMMU-Pro | 78.5% | – |
| AA-Omniscience | 10.9 | 4.6 |
| Terminal-Bench Hard | 53.0% | 40.9% |
| GPQA Diamond (AA) | 91.5% | 87.0% |
| Humanity's Last Exam (AA) | 42.5% | 30.4% |
| τ²-Bench Telecom (AA) | 86.0% | 95.0% |
| 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 Mimo v2 Pro: questions
- Is GPT-5.3-Codex better than Mimo v2 Pro?
- GPT-5.3-Codex leads on quality: 62.5 vs 60.6. The BenchLeader Index combines every independent quality benchmark; GPT-5.3-Codex is ahead overall as of 2026-09-10, but check the category scores for your use.
- Is GPT-5.3-Codex better than Mimo v2 Pro for coding?
- GPT-5.3-Codex scores higher in coding (55 vs 55 on the category index, where 50 is average).
- Is GPT-5.3-Codex better than Mimo v2 Pro for agentic tasks?
- Mimo v2 Pro scores higher in agentic tasks (69 vs 63 on the category index, where 50 is average).
- Which is cheaper, GPT-5.3-Codex or Mimo v2 Pro?
- Mimo v2 Pro is cheaper: $3.00 against $4.81 per million tokens, blended at three input tokens per output token.
- Which has the larger context window?
- Mimo v2 Pro accepts more context: 1.0M against 400k tokens.