GPT-5.5 Pro vs Mimo v2 Pro
GPT-5.5 Pro 
Mimo v2 Pro Verdict
- GPT-5.5 Pro (xhigh) leads on quality: 67.1 vs 59.8.
- GPT-5.5 Pro (xhigh) is stronger in maths, reasoning.
- Mimo v2 Pro is stronger in agents & tools, coding, composite, human preference, instruction following, knowledge, long context.
- Mimo v2 Pro is 23× cheaper ($3.00 vs $67.50 per 1M blended).
| Metric | GPT-5.5 Pro (xhigh) | Mimo v2 Pro |
|---|---|---|
| BenchLeader Index | 67.1 | 59.8 |
| Maths score | 74.5 | 64.3 |
| Reasoning score | 80.1 | 50.1 |
| Agents & tools score | – | 69.2 |
| Coding score | – | 54.5 |
| Composite score | – | 65.3 |
| Human preference score | – | 64.3 |
| Instruction following score | – | 67.7 |
| Knowledge score | – | 66.4 |
| Long context score | – | 60.4 |
| Blended price $/M | $67.50 | $3.00 |
| Output speed | 4 tok/s | – |
| Time to first answer | 3.5 s | – |
| Context window | 1.1M | 1.0M |
| FrontierMath Tiers 1–3 | 87.7% | – |
| FrontierMath Tier 4 | 78.0% | – |
| LMArena Text | – | 1448 |
| LMArena Hard Prompts | – | 1476 |
| LMArena Coding | – | 1503 |
| LMArena WebDev | – | 1434 |
| AA Intelligence Index | – | 28.6 |
| IFBench | – | 68.8% |
| AA-LCR | – | 68.3% |
| AA-Omniscience | – | 4.6 |
| Terminal-Bench Hard | – | 40.9% |
| GPQA Diamond (AA) | – | 87.0% |
| Humanity's Last Exam (AA) | – | 30.4% |
| τ²-Bench Telecom (AA) | – | 95.0% |
| ARC-AGI-1 | 95.0% | – |
| ARC-AGI-2 | 84.2% | – |
| CritPt | 30.6% | 0.3% |
| LMArena Maths | – | 1452 |
| LMArena Creative Writing | – | 1426 |
| LMArena Instruction Following | – | 1444 |
| LMArena Multi-turn | – | 1469 |
| LMArena Longer Queries | – | 1467 |
| CL-bench | – | 15.7% |
| CL-bench Life | – | 6.9% |
| LMCA | 53.9% | – |
| DTBench | 96.0% | – |
| ALE-Bench | – | 785.2 |
Data as of 2026-09-19. Best configuration of each model; every score links to its source on the model pages.
GPT-5.5 Pro vs Mimo v2 Pro: questions
- Is GPT-5.5 Pro better than Mimo v2 Pro?
- GPT-5.5 Pro (xhigh) leads on quality: 67.1 vs 59.8. The BenchLeader Index combines every independent quality benchmark; GPT-5.5 Pro (xhigh) is ahead overall as of 2026-09-19, but check the category scores for your use.
- Which is cheaper, GPT-5.5 Pro or Mimo v2 Pro?
- Mimo v2 Pro is cheaper: $3.00 against $67.50 per million tokens, blended at three input tokens per output token.
- Which has the larger context window?
- GPT-5.5 Pro accepts more context: 1.1M against 1.0M tokens.