GPT-5.5 Instant vs Mimo v2 Pro
GPT-5.5 Instant 
Mimo v2 Pro Verdict
- GPT-5.5 Instant and Mimo v2 Pro are level on quality (60.5 vs 60.6).
- GPT-5.5 Instant is stronger in agents & tools, coding, human preference, instruction following, knowledge, long context, maths, multimodal.
- Mimo v2 Pro is stronger in composite, reasoning.
- Mimo v2 Pro is 3.8× cheaper ($3.00 vs $11.25 per 1M blended).
| Metric | GPT-5.5 Instant | Mimo v2 Pro |
|---|---|---|
| BenchLeader Index | 60.5 | 60.6 |
| Agents & tools score | 70.7 | 69.4 |
| Coding score | 61.1 | 54.7 |
| Composite score | 62.9 | 65.2 |
| Human preference score | 67.5 | 64.5 |
| Instruction following score | 69.8 | 67.5 |
| Knowledge score | 69.4 | 66.3 |
| Long context score | 61.4 | 60.5 |
| Maths score | 42.5 | – |
| Multimodal score | 59.7 | – |
| Reasoning score | 62.6 | 65.2 |
| Blended price $/M | $11.25 | $3.00 |
| Output speed | 129 tok/s | – |
| Time to first answer | 16.8 s | – |
| Context window | 400k | 1.0M |
| GPQA Diamond | 82.5% | – |
| FrontierMath Tiers 1–3 | 26.3% | – |
| FrontierMath Tier 4 | 2.4% | – |
| OTIS Mock AIME | 68.1% | – |
| SciCode | 48.6% | – |
| Epoch Capabilities Index | 142.5 | – |
| LMArena Text | 1474 | 1448 |
| LMArena Hard Prompts | 1491 | 1476 |
| LMArena Coding | 1514 | 1503 |
| LMArena WebDev | – | 1433 |
| LMArena Vision | 1251 | – |
| AA Intelligence Index | 26.8 | 28.6 |
| IFBench | 71.5% | 68.8% |
| AA-LCR | 70.0% | 68.3% |
| AA-Omniscience | 11.2 | 4.6 |
| Terminal-Bench Hard | 42.4% | 40.9% |
| GPQA Diamond (AA) | 84.7% | 87.0% |
| Humanity's Last Exam (AA) | 21.6% | 30.4% |
| SciCode (AA) | 52.5% | – |
| τ²-Bench Telecom (AA) | 49.4% | 95.0% |
Data as of 2026-09-10. Best configuration of each model; every score links to its source on the model pages.
GPT-5.5 Instant vs Mimo v2 Pro: questions
- Is GPT-5.5 Instant better than Mimo v2 Pro?
- GPT-5.5 Instant and Mimo v2 Pro are level on quality (60.5 vs 60.6). The BenchLeader Index combines every independent quality benchmark; Mimo v2 Pro is ahead overall as of 2026-09-10, but check the category scores for your use.
- Is GPT-5.5 Instant better than Mimo v2 Pro for coding?
- GPT-5.5 Instant scores higher in coding (61 vs 55 on the category index, where 50 is average).
- Is GPT-5.5 Instant better than Mimo v2 Pro for agentic tasks?
- GPT-5.5 Instant scores higher in agentic tasks (71 vs 69 on the category index, where 50 is average).
- Which is cheaper, GPT-5.5 Instant or Mimo v2 Pro?
- Mimo v2 Pro is cheaper: $3.00 against $11.25 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.