GPT-5.3-Codex vs MiMo-V2.6-Pro
GPT-5.3-Codex 
MiMo-V2.6-Pro Verdict
- GPT-5.3-Codex (xhigh) and MiMo-V2.6-Pro are level on quality (64.6 vs 64.3).
- GPT-5.3-Codex (xhigh) is stronger in agents & tools, coding, instruction following, knowledge, multimodal.
- MiMo-V2.6-Pro is stronger in composite, long context, reasoning.
- MiMo-V2.6-Pro is 8.8× cheaper ($0.548 vs $4.81 per 1M blended).
- GPT-5.3-Codex (xhigh) streams 2.7× faster (146 vs 54 tokens per second).
| Metric | GPT-5.3-Codex (xhigh) | MiMo-V2.6-Pro |
|---|---|---|
| BenchLeader Index | 64.6 | 64.3 |
| Agents & tools score | 79.8 | 55.1 |
| Coding score | 61.1 | – |
| Composite score | 68.2 | 84.8 |
| Instruction following score | 73.4 | – |
| Knowledge score | 67.9 | 66.8 |
| Long context score | 67.5 | 69.1 |
| Multimodal score | 62.2 | – |
| Reasoning score | 71.5 | 88.8 |
| Blended price $/M | $4.81 | $0.548 |
| Output speed | 146 tok/s | 54 tok/s |
| Time to first answer | 52.3 s | 39.8 s |
| Context window | 400k | 1.0M |
| WeirdML | 77.9% | – |
| AA Intelligence Index | 32.5 | 46.3 |
| IFBench | 75.4% | – |
| AA-LCR | 83.3% | 86.3% |
| MMMU-Pro | 78.5% | – |
| AA-Omniscience | 10.9 | 8.4 |
| Terminal-Bench Hard | 53.0% | – |
| GPQA Diamond (AA) | 91.5% | – |
| Humanity's Last Exam (AA) | 42.5% | 49.4% |
| SciCode (AA) | – | 60.9% |
| τ²-Bench Telecom (AA) | 86.0% | – |
| LiveCodeBench | 87.3% | – |
| IOI | 53.8% | – |
| Terminal-Bench 2.1 (Vals) | – | 67.8% |
| SWE-bench (Vals) | 78.0% | – |
| Vals Index | – | 59.7 |
| CritPt | 16.9% | 26.6% |
| GDPval (AA) | – | 58.7% |
| Code Migration | – | 43.0% |
| Excel Modeling Benchmark | – | 62.9% |
| Finance Agent v2 | – | 58.3% |
| Harvey's Legal Agent Benchmark | – | 10.8% |
| Legal Research Bench | – | 47.1% |
| Terminal-Bench Science | – | 2.9% |
| Vibe Code Bench v1.1 | 61.8% | 85.2% |
| ALE-Bench | 1655.2 | – |
| Terminal-Bench 4.0 (AA) | – | 34.9% |
| AutomationBench | – | 58.6% |
| GDP.pdf | – | 19.2% |
| AA-Omniscience: accuracy | 52.9% | 34.9% |
| AA-Omniscience: non-hallucination | 10.8% | 59.4% |
| AA-Briefcase | – | 1522 |
Data as of 2026-09-23. Best configuration of each model; every score links to its source on the model pages.
GPT-5.3-Codex vs MiMo-V2.6-Pro: questions
- Is GPT-5.3-Codex better than MiMo-V2.6-Pro?
- GPT-5.3-Codex (xhigh) and MiMo-V2.6-Pro are level on quality (64.6 vs 64.3). The BenchLeader Index combines every independent quality benchmark; GPT-5.3-Codex (xhigh) is ahead overall as of 2026-09-23, but check the category scores for your use.
- Is GPT-5.3-Codex better than MiMo-V2.6-Pro for agentic tasks?
- GPT-5.3-Codex scores higher in agentic tasks (80 vs 55 on the category index, where 50 is average).
- Which is cheaper, GPT-5.3-Codex or MiMo-V2.6-Pro?
- MiMo-V2.6-Pro is cheaper: $0.548 against $4.81 per million tokens, blended at three input tokens per output token.
- Which is faster, GPT-5.3-Codex or MiMo-V2.6-Pro?
- GPT-5.3-Codex streams faster: 146 against 54 output tokens per second.
- Which has the larger context window?
- MiMo-V2.6-Pro accepts more context: 1.0M against 400k tokens.