Model comparison
GPT-5.5 Pro vs MiMo-V2.5-Pro
GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 44.8 on the Noometry Index. MiMo-V2.5-Pro costs 124× less per token, which makes it the better buy when GPT-5.5 Pro's lead doesn't matter for your workload.
Last verified . 3 shared benchmarks.
Summary
- They share 3 benchmarks with published results for both. GPT-5.5 Pro scores higher in 3 categories and MiMo-V2.5-Pro in 0 categories; 3 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where GPT-5.5 Pro leads 73.6 to 25.9.
- The biggest single-benchmark swing is CritPt: 30.6% for GPT-5.5 Pro and 4% for MiMo-V2.5-Pro.
- MiMo-V2.5-Pro is cheaper at $0.43 / $0.87 per million input/output tokens, against $30 / $180 for GPT-5.5 Pro.
- GPT-5.5 Pro accepts more context: 1.05M tokens versus 1.05M.
- MiMo-V2.5-Pro has downloadable open weights; the other is API-only.
Side by side
| GPT-5.5 Pro | MiMo-V2.5-Pro | |
|---|---|---|
| Provider | OpenAI | Xiaomi |
| Noometry Index | 64.3 | 44.8 |
| Released | 2026-04-23 | 2026-04-22 |
| Weights | Proprietary | Open |
| Context window | 1.05M | 1.05M |
| Max output | 128K | 131K |
| Input $ / M tokens | $30 | $0.43 |
| Output $ / M tokens | $180 | $0.87 |
| Results tracked | 14 | 27 |
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Category by category
Coding Not comparable
GPT-5.5 Pro: —, MiMo-V2.5-Pro: 47.0 (#58)
| Benchmark | GPT-5.5 Pro | MiMo-V2.5-Pro |
|---|---|---|
| LMArena WebDev | — | 1477 |
| SciCode | — | 50.2% |
| LMArena Coding | — | 1502 |
| ALE-Bench | — | 899.8 |
Reasoning GPT-5.5 Pro leads
GPT-5.5 Pro: 73.6 (#7), MiMo-V2.5-Pro: 25.9 (#124)
| Benchmark | GPT-5.5 Pro | MiMo-V2.5-Pro |
|---|---|---|
| CritPt | 30.6% | 4% |
| DTBench | 96% | 84.5% |
| LMCA | 53.9% | 29.5% |
| ARC-AGI-2 | 84.6% | — |
| SimpleBench | 76.9% | — |
| NYT Connections (extended) | — | 34.4% |
| ARC-AGI-1 | 96.5% | — |
| Chess Puzzles | 64% | — |
| LMArena Hard Prompts | — | 1487 |
| Epoch Capabilities Index | 162.45 | — |
Math GPT-5.5 Pro leads
GPT-5.5 Pro: 83.8 (#8), MiMo-V2.5-Pro: 38.6 (#84)
| Benchmark | GPT-5.5 Pro | MiMo-V2.5-Pro |
|---|---|---|
| FrontierMath (Tiers 1-3) | 87.7% | — |
| FrontierMath Tier 4 | 78% | — |
| OTIS Mock AIME 2024-2025 | 100% | — |
| ProofBench | — | 22% |
| LMArena Math | — | 1480 |
| FrontierMath (Feb 2025 set) | 52.4% | — |
| FrontierMath Tier 4 (v1) | 39.6% | — |
Knowledge GPT-5.5 Pro leads
GPT-5.5 Pro: 64.2 (#17), MiMo-V2.5-Pro: 41.5 (#100)
| Benchmark | GPT-5.5 Pro | MiMo-V2.5-Pro |
|---|---|---|
| GPQA Diamond | 93.9% | — |
| LMArena Expert | — | 1501 |
Multilingual Not comparable
GPT-5.5 Pro: —, MiMo-V2.5-Pro: 55.3 (#33)
| Benchmark | GPT-5.5 Pro | MiMo-V2.5-Pro |
|---|---|---|
| LMArena Non-English | — | 1449 |
| LMArena Chinese | — | 1507 |
| LMArena French | — | 1489 |
| LMArena German | — | 1455 |
| LMArena Japanese | — | 1418 |
| LMArena Korean | — | 1436 |
| LMArena Russian | — | 1450 |
| LMArena Spanish | — | 1470 |
Instruction Following Not comparable
GPT-5.5 Pro: —, MiMo-V2.5-Pro: 77.6 (#21)
| Benchmark | GPT-5.5 Pro | MiMo-V2.5-Pro |
|---|---|---|
| LMArena Instruction Following | — | 1477 |
Long Context Not comparable
GPT-5.5 Pro: —, MiMo-V2.5-Pro: 45.4 (#38)
| Benchmark | GPT-5.5 Pro | MiMo-V2.5-Pro |
|---|---|---|
| LMArena Longer Query | — | 1482 |
Writing & Preference Not comparable
GPT-5.5 Pro: —, MiMo-V2.5-Pro: 65.5 (#47)
| Benchmark | GPT-5.5 Pro | MiMo-V2.5-Pro |
|---|---|---|
| LMArena Text | — | 1465 |
| LMArena Creative Writing | — | 1440 |
| EQ-Bench Creative Writing | — | 1493 |
| EQ-Bench 4 | — | 1208 |
| LMArena Multi-Turn | — | 1477 |
Frequently asked questions
Is GPT-5.5 Pro better than MiMo-V2.5-Pro?
GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 44.8 on the Noometry Index. MiMo-V2.5-Pro costs 124× less per token, which makes it the better buy when GPT-5.5 Pro's lead doesn't matter for your workload.
Which is cheaper, GPT-5.5 Pro or MiMo-V2.5-Pro?
MiMo-V2.5-Pro is cheaper. It lists at $0.43 per million input tokens and $0.87 per million output tokens; GPT-5.5 Pro lists at $30 and $180.
Which has the bigger context window?
GPT-5.5 Pro does, with 1.05M tokens against 1.05M.
How many benchmarks do GPT-5.5 Pro and MiMo-V2.5-Pro share?
3 benchmarks have published results for both models. GPT-5.5 Pro has 14 scored results on Noometry and MiMo-V2.5-Pro has 27.