Model comparison
GPT-5.4 Pro vs MiMo-V2.6-Flash
GPT-5.4 Pro is the stronger model overall, scoring 58.9 to 48.5 on the Noometry Index. MiMo-V2.6-Flash costs 386× less per token, which makes it the better buy when GPT-5.4 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-5.4 Pro scores higher in 3 categories and MiMo-V2.6-Flash in 1 category; 4 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where GPT-5.4 Pro leads 70.7 to 36.5.
- The biggest single-benchmark swing is CritPt: 30% for GPT-5.4 Pro and 12% for MiMo-V2.6-Flash.
- MiMo-V2.6-Flash is cheaper at $0.14 / $0.28 per million input/output tokens, against $30 / $180 for GPT-5.4 Pro.
- GPT-5.4 Pro accepts more context: 1.05M tokens versus 1.05M.
- MiMo-V2.6-Flash has downloadable open weights; the other is API-only.
Side by side
| GPT-5.4 Pro | MiMo-V2.6-Flash | |
|---|---|---|
| Provider | OpenAI | Xiaomi |
| Noometry Index | 58.9 | 48.5 |
| Released | 2026-03-05 | 2026-09-21 |
| Weights | Proprietary | Open |
| Context window | 1.05M | 1.05M |
| Max output | 128K | 131K |
| Input $ / M tokens | $30 | $0.14 |
| Output $ / M tokens | $180 | $0.28 |
| Results tracked | 16 | 19 |
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Category by category
Coding MiMo-V2.6-Flash leads
GPT-5.4 Pro: 43.2 (#90), MiMo-V2.6-Flash: 53.4 (#30)
| Benchmark | GPT-5.4 Pro | MiMo-V2.6-Flash |
|---|---|---|
| LMArena WebDev | — | 1637 |
| SciCode | — | 51.3% |
| WeirdML | 57.4% | — |
| LMArena Coding | — | 1504 |
Reasoning GPT-5.4 Pro leads
GPT-5.4 Pro: 70.7 (#13), MiMo-V2.6-Flash: 36.5 (#66)
| Benchmark | GPT-5.4 Pro | MiMo-V2.6-Flash |
|---|---|---|
| CritPt | 30% | 12% |
| ARC-AGI-2 | 83.3% | — |
| SimpleBench | 74.1% | — |
| ARC-AGI-1 | 94.5% | — |
| Chess Puzzles | 58.6% | — |
| EnigmaEval | 23.8% | — |
| LMArena Hard Prompts | — | 1482 |
| Epoch Capabilities Index | 158.93 | — |
Math GPT-5.4 Pro leads
GPT-5.4 Pro: 72.4 (#22), MiMo-V2.6-Flash: 51.9 (#52)
| Benchmark | GPT-5.4 Pro | MiMo-V2.6-Flash |
|---|---|---|
| FrontierMath (Tiers 1-3) | 82.5% | — |
| FrontierMath Tier 4 | 58.5% | — |
| ProofBench | — | 63% |
| LMArena Math | — | 1468 |
| FrontierMath (Feb 2025 set) | 50% | — |
| FrontierMath Tier 4 (v1) | 37.5% | — |
Knowledge GPT-5.4 Pro leads
GPT-5.4 Pro: 68.3 (#7), MiMo-V2.6-Flash: 42.2 (#99)
| Benchmark | GPT-5.4 Pro | MiMo-V2.6-Flash |
|---|---|---|
| GPQA Diamond | 94.6% | — |
| Humanity's Last Exam | 44.3% | — |
| SimpleQA Verified | 46.3% | — |
| Vectara Hallucination Rate | 8.3% | — |
| LMArena Expert | — | 1501 |
Multimodal Not comparable
GPT-5.4 Pro: —, MiMo-V2.6-Flash: 40.5 (#47)
| Benchmark | GPT-5.4 Pro | MiMo-V2.6-Flash |
|---|---|---|
| LMArena Vision | — | 1259 |
Multilingual Not comparable
GPT-5.4 Pro: —, MiMo-V2.6-Flash: 54.0 (#51)
| Benchmark | GPT-5.4 Pro | MiMo-V2.6-Flash |
|---|---|---|
| LMArena Non-English | — | 1434 |
| LMArena Chinese | — | 1511 |
| LMArena French | — | 1475 |
| LMArena Russian | — | 1409 |
| LMArena Spanish | — | 1456 |
Instruction Following Not comparable
GPT-5.4 Pro: —, MiMo-V2.6-Flash: 76.8 (#35)
| Benchmark | GPT-5.4 Pro | MiMo-V2.6-Flash |
|---|---|---|
| LMArena Instruction Following | — | 1463 |
Long Context Not comparable
GPT-5.4 Pro: —, MiMo-V2.6-Flash: 44.8 (#57)
| Benchmark | GPT-5.4 Pro | MiMo-V2.6-Flash |
|---|---|---|
| LMArena Longer Query | — | 1463 |
Writing & Preference Not comparable
GPT-5.4 Pro: —, MiMo-V2.6-Flash: 63.1 (#67)
| Benchmark | GPT-5.4 Pro | MiMo-V2.6-Flash |
|---|---|---|
| LMArena Text | — | 1455 |
| LMArena Creative Writing | — | 1400 |
| LMArena Multi-Turn | — | 1451 |
Frequently asked questions
Is GPT-5.4 Pro better than MiMo-V2.6-Flash?
GPT-5.4 Pro is the stronger model overall, scoring 58.9 to 48.5 on the Noometry Index. MiMo-V2.6-Flash costs 386× less per token, which makes it the better buy when GPT-5.4 Pro's lead doesn't matter for your workload.
Which is cheaper, GPT-5.4 Pro or MiMo-V2.6-Flash?
MiMo-V2.6-Flash is cheaper. It lists at $0.14 per million input tokens and $0.28 per million output tokens; GPT-5.4 Pro lists at $30 and $180.
Is GPT-5.4 Pro or MiMo-V2.6-Flash better for coding?
MiMo-V2.6-Flash scores higher on coding benchmarks: 53.4 versus 43.2 in the Noometry coding category.
Which has the bigger context window?
GPT-5.4 Pro does, with 1.05M tokens against 1.05M.
How many benchmarks do GPT-5.4 Pro and MiMo-V2.6-Flash share?
1 benchmark has published results for both models. GPT-5.4 Pro has 16 scored results on Noometry and MiMo-V2.6-Flash has 19.