Model comparison
GPT-5.5 Pro vs MiMo-V2.6-Pro
GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 50.3 on the Noometry Index. MiMo-V2.6-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 . 1 shared benchmarks.
Summary
- They share 1 benchmark with published results for both. GPT-5.5 Pro scores higher in 3 categories and MiMo-V2.6-Pro in 0 categories; 3 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where GPT-5.5 Pro leads 73.3 to 43.1.
- MiMo-V2.6-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-V2.6-Pro has downloadable open weights; the other is API-only.
Side by side
| GPT-5.5 Pro | MiMo-V2.6-Pro | |
|---|---|---|
| Provider | OpenAI | Xiaomi |
| Noometry Index | 64.3 | 50.3 |
| Released | 2026-04-23 | 2026-09-21 |
| 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 | 19 |
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Category by category
Coding Not comparable
GPT-5.5 Pro: —, MiMo-V2.6-Pro: 55.5 (#23)
| Benchmark | GPT-5.5 Pro | MiMo-V2.6-Pro |
|---|---|---|
| LMArena WebDev | — | 1629 |
| SciCode | — | 60.9% |
| LMArena Coding | — | 1534 |
| ALE-Bench | — | 1,158 |
Agentic & Tool Use Not comparable
GPT-5.5 Pro: —, MiMo-V2.6-Pro: 37.5 (#35)
| Benchmark | GPT-5.5 Pro | MiMo-V2.6-Pro |
|---|---|---|
| APEX-Agents | — | 59.5% |
Reasoning GPT-5.5 Pro leads
GPT-5.5 Pro: 73.3 (#10), MiMo-V2.6-Pro: 43.1 (#50)
| Benchmark | GPT-5.5 Pro | MiMo-V2.6-Pro |
|---|---|---|
| CritPt | 30.6% | 26.6% |
| ARC-AGI-2 | 84.6% | — |
| SimpleBench | 76.9% | — |
| ARC-AGI-1 | 96.5% | — |
| Chess Puzzles | 64% | — |
| LMArena Hard Prompts | — | 1512 |
| DTBench | 96% | — |
| LMCA | 53.9% | — |
| Epoch Capabilities Index | 162.07 | — |
Math GPT-5.5 Pro leads
GPT-5.5 Pro: 84.0 (#10), MiMo-V2.6-Pro: 54.5 (#45)
| Benchmark | GPT-5.5 Pro | MiMo-V2.6-Pro |
|---|---|---|
| FrontierMath (Tiers 1-3) | 87.7% | — |
| FrontierMath Tier 4 | 78% | — |
| OTIS Mock AIME 2024-2025 | 100% | — |
| ProofBench | — | 70% |
| LMArena Math | — | 1494 |
| FrontierMath (Feb 2025 set) | 52.4% | — |
| FrontierMath Tier 4 (v1) | 39.6% | — |
Knowledge GPT-5.5 Pro leads
GPT-5.5 Pro: 64.1 (#19), MiMo-V2.6-Pro: 43.5 (#92)
| Benchmark | GPT-5.5 Pro | MiMo-V2.6-Pro |
|---|---|---|
| GPQA Diamond | 93.9% | — |
| LMArena Expert | — | 1543 |
Multimodal Not comparable
GPT-5.5 Pro: —, MiMo-V2.6-Pro: 40.8 (#43)
| Benchmark | GPT-5.5 Pro | MiMo-V2.6-Pro |
|---|---|---|
| LMArena Vision | — | 1264 |
Multilingual Not comparable
GPT-5.5 Pro: —, MiMo-V2.6-Pro: 56.9 (#14)
| Benchmark | GPT-5.5 Pro | MiMo-V2.6-Pro |
|---|---|---|
| LMArena Non-English | — | 1474 |
| LMArena Chinese | — | 1529 |
| LMArena Russian | — | 1480 |
Instruction Following Not comparable
GPT-5.5 Pro: —, MiMo-V2.6-Pro: 78.2 (#12)
| Benchmark | GPT-5.5 Pro | MiMo-V2.6-Pro |
|---|---|---|
| LMArena Instruction Following | — | 1493 |
Long Context Not comparable
GPT-5.5 Pro: —, MiMo-V2.6-Pro: 46.0 (#27)
| Benchmark | GPT-5.5 Pro | MiMo-V2.6-Pro |
|---|---|---|
| LMArena Longer Query | — | 1501 |
Writing & Preference Not comparable
GPT-5.5 Pro: —, MiMo-V2.6-Pro: 66.8 (#33)
| Benchmark | GPT-5.5 Pro | MiMo-V2.6-Pro |
|---|---|---|
| LMArena Text | — | 1492 |
| LMArena Creative Writing | — | 1468 |
| LMArena Multi-Turn | — | 1464 |
Frequently asked questions
Is GPT-5.5 Pro better than MiMo-V2.6-Pro?
GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 50.3 on the Noometry Index. MiMo-V2.6-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-V2.6-Pro?
MiMo-V2.6-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-V2.6-Pro share?
1 benchmark has published results for both models. GPT-5.5 Pro has 14 scored results on Noometry and MiMo-V2.6-Pro has 19.