Model comparison
GPT-4o mini vs GPT-5.5 Instant
GPT-5.5 Instant is the stronger model overall, scoring 42.7 to 25.5 on the Noometry Index.
Last verified . 23 shared benchmarks.
Summary
- They share 23 benchmarks with published results for both. GPT-4o mini scores higher in 0 categories and GPT-5.5 Instant in 9 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where GPT-5.5 Instant leads 48.9 to 17.7.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 6.9% for GPT-4o mini and 68.1% for GPT-5.5 Instant.
Side by side
| GPT-4o mini | GPT-5.5 Instant | |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Noometry Index | 25.5 | 42.7 |
| Released | 2024-07-18 | 2026-05-05 |
| Weights | Proprietary | Proprietary |
| Context window | 128K | — |
| Max output | 16K | — |
| Input $ / M tokens | $0.15 | — |
| Output $ / M tokens | $0.60 | — |
| Results tracked | 60 | 27 |
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Category by category
Coding GPT-5.5 Instant leads
GPT-4o mini: 22.0 (#335), GPT-5.5 Instant: 44.3 (#74)
| Benchmark | GPT-4o mini | GPT-5.5 Instant |
|---|---|---|
| LMArena Coding | 1290 | 1433 |
| Aider Polyglot | 3.6% | — |
| SciCode | — | 48.6% |
| WeirdML | 11.8% | — |
| BigCodeBench Instruct | 46.1% | — |
| LiveBench Coding | 43.1% | — |
| BigCodeBench Complete | 57.4% | — |
| HumanEval+ | 83.5% | — |
| MBPP+ | 72.2% | — |
Agentic & Tool Use Not comparable
GPT-4o mini: 27.5 (#101), GPT-5.5 Instant: —
| Benchmark | GPT-4o mini | GPT-5.5 Instant |
|---|---|---|
| BALROG | 17.4% | — |
Reasoning GPT-5.5 Instant leads
GPT-4o mini: 8.7 (#347), GPT-5.5 Instant: 24.9 (#155)
| Benchmark | GPT-4o mini | GPT-5.5 Instant |
|---|---|---|
| Chess Puzzles | 0% | 12% |
| LMArena Hard Prompts | 1267 | 1426 |
| Epoch Capabilities Index | 126.56 | 142.52 |
| ARC-AGI-2 | 0% | — |
| SimpleBench | 10.7% | — |
| Kagi LLM Benchmark | 28.8% | — |
| CritPt | — | 0% |
| LiveBench Reasoning | 32.8% | — |
| Mystery Game Puzzles | 12% | — |
| DTBench | 54.4% | — |
| LiveBench Data Analysis | 50% | — |
| LMCA | 10.4% | — |
| LiveBench | 41.3% | — |
| PIQA | 88.7% | — |
Math GPT-5.5 Instant leads
GPT-4o mini: 10.4 (#314), GPT-5.5 Instant: 26.5 (#259)
| Benchmark | GPT-4o mini | GPT-5.5 Instant |
|---|---|---|
| FrontierMath (Tiers 1-3) | 0.7% | 26.3% |
| OTIS Mock AIME 2024-2025 | 6.9% | 68.1% |
| LMArena Math | 1267 | 1420 |
| FrontierMath Tier 4 | — | 2.4% |
| Omni-MATH | 28% | — |
| LiveBench Math | 36.3% | — |
| MATH Level 5 | 52.6% | — |
| GSM8K | 91.3% | — |
Knowledge GPT-5.5 Instant leads
GPT-4o mini: 17.7 (#284), GPT-5.5 Instant: 48.9 (#74)
| Benchmark | GPT-4o mini | GPT-5.5 Instant |
|---|---|---|
| GPQA Diamond | 37.7% | 82.5% |
| LMArena Expert | 1235 | 1409 |
| SimpleQA Verified | 8.3% | — |
| MMLU-Pro | 60.3% | — |
| Confabulations | 37.2% | — |
| GPQA (HELM) | 36.8% | — |
| BoolQ | 88.7% | — |
| MMLU | 81.8% | — |
Multimodal GPT-5.5 Instant leads
GPT-4o mini: 25.9 (#122), GPT-5.5 Instant: 40.0 (#52)
| Benchmark | GPT-4o mini | GPT-5.5 Instant |
|---|---|---|
| LMArena Vision | 1066 | 1250 |
| Video-MME | 64.8% | — |
| GeoBench | 64% | — |
| VPCT | 34% | — |
| LMArena Document | — | 1403 |
Multilingual GPT-5.5 Instant leads
GPT-4o mini: 42.0 (#199), GPT-5.5 Instant: 52.8 (#80)
| Benchmark | GPT-4o mini | GPT-5.5 Instant |
|---|---|---|
| LMArena Non-English | 1266 | 1417 |
| LMArena Chinese | 1265 | 1456 |
| LMArena French | 1297 | 1428 |
| LMArena German | 1272 | 1411 |
| LMArena Japanese | 1216 | 1408 |
| LMArena Korean | 1195 | 1392 |
| LMArena Russian | 1275 | 1431 |
| LMArena Spanish | 1276 | 1429 |
Instruction Following GPT-5.5 Instant leads
GPT-4o mini: 61.9 (#239), GPT-5.5 Instant: 74.2 (#100)
| Benchmark | GPT-4o mini | GPT-5.5 Instant |
|---|---|---|
| LMArena Instruction Following | 1258 | 1406 |
| LiveBench Instruction Following | 56.8% | — |
| IFEval | 78.2% | — |
Long Context GPT-5.5 Instant leads
GPT-4o mini: 39.1 (#186), GPT-5.5 Instant: 43.4 (#96)
| Benchmark | GPT-4o mini | GPT-5.5 Instant |
|---|---|---|
| LMArena Longer Query | 1289 | 1422 |
Writing & Preference GPT-5.5 Instant leads
GPT-4o mini: 39.5 (#248), GPT-5.5 Instant: 61.8 (#85)
| Benchmark | GPT-4o mini | GPT-5.5 Instant |
|---|---|---|
| LMArena Text | 1286 | 1419 |
| LMArena Creative Writing | 1268 | 1419 |
| LMArena Multi-Turn | 1285 | 1433 |
| Short-Story Creative Writing | 67.2% | — |
| EQ-Bench Creative Writing | 873 | — |
| WildBench | 79.1% | — |
| LiveBench Language | 28.6% | — |
Frequently asked questions
Is GPT-4o mini better than GPT-5.5 Instant?
GPT-5.5 Instant is the stronger model overall, scoring 42.7 to 25.5 on the Noometry Index.
Is GPT-4o mini or GPT-5.5 Instant better for coding?
GPT-5.5 Instant scores higher on coding benchmarks: 44.3 versus 22.0 in the Noometry coding category.
How many benchmarks do GPT-4o mini and GPT-5.5 Instant share?
23 benchmarks have published results for both models. GPT-4o mini has 60 scored results on Noometry and GPT-5.5 Instant has 27.