Model comparison
GPT-5.5 vs o4-mini
GPT-5.5 is the stronger model overall, scoring 63.4 to 41.6 on the Noometry Index. o4-mini costs 5.8× less per token, which makes it the better buy when GPT-5.5's lead doesn't matter for your workload.
Last verified . 40 shared benchmarks.
Summary
- They share 40 benchmarks with published results for both. GPT-5.5 scores higher in 10 categories and o4-mini in 0 categories; 10 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where GPT-5.5 leads 72.8 to 24.6.
- The biggest single-benchmark swing is ARC-AGI-2: 85% for GPT-5.5 and 6.1% for o4-mini.
- o4-mini is cheaper at $1.10 / $4.40 per million input/output tokens, against $5 / $30 for GPT-5.5.
- GPT-5.5 accepts more context: 1.05M tokens versus 200K.
Side by side
| GPT-5.5 | o4-mini | |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Noometry Index | 63.4 | 41.6 |
| Released | 2026-04-23 | 2025-04-16 |
| Weights | Proprietary | Proprietary |
| Context window | 1.05M | 200K |
| Max output | 128K | 100K |
| Input $ / M tokens | $5 | $1.10 |
| Output $ / M tokens | $30 | $4.40 |
| Results tracked | 71 | 60 |
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Category by category
Coding GPT-5.5 leads
GPT-5.5: 58.2 (#17), o4-mini: 40.9 (#127)
| Benchmark | GPT-5.5 | o4-mini |
|---|---|---|
| GSO | 40.2% | 3.6% |
| WeirdML | 84.9% | 52.6% |
| LMArena Coding | 1494 | 1368 |
| ALE-Bench | 1,943 | 826.17 |
| SWE-bench Verified | 80.6% | — |
| DeepSWE | 67% | — |
| FrontierCode | 43% | — |
| SWE-bench Verified (bash only) | — | 45% |
| Aider Polyglot | — | 72% |
| LMArena WebDev | 1513 | — |
| SciCode | 56.1% | — |
| MirrorCode | 10% | — |
| CadEval | — | 62% |
| AlgoTune | — | 1.72 |
Agentic & Tool Use GPT-5.5 leads
GPT-5.5: 50.7 (#6), o4-mini: 32.6 (#61)
| Benchmark | GPT-5.5 | o4-mini |
|---|---|---|
| Terminal-Bench | 84.7% | — |
| APEX-Agents | 55.1% | — |
| Berkeley Function Calling Leaderboard | — | 53.2% |
| OSWorld 2.0 | 13% | — |
| GDPval | — | 25.3% |
| Remote Labor Index | 6.3% | — |
| τ²-bench Banking | 44.6% | — |
| DeepResearch Bench | 54% | — |
| PostTrainBench | 27.2% | — |
| ExploitBench | 47.4% | — |
| GBAEval | 53.2% | — |
| GDP.pdf | 26% | — |
| LMArena Search | 1242 | — |
| METR Time Horizons | — | 63.9% |
| Vending-Bench 2 | 7,524 | — |
Reasoning GPT-5.5 leads
GPT-5.5: 72.8 (#11), o4-mini: 24.6 (#162)
| Benchmark | GPT-5.5 | o4-mini |
|---|---|---|
| ARC-AGI-2 | 85% | 6.1% |
| SimpleBench | 69% | 38.7% |
| Kagi LLM Benchmark | 88.8% | 67.6% |
| ARC-AGI-1 | 95% | 58.7% |
| CritPt | 27.1% | 0.6% |
| Chess Puzzles | 54% | 26% |
| LMArena Hard Prompts | 1489 | 1351 |
| Mystery Game Puzzles | 56% | 5% |
| DTBench | 96% | 77.6% |
| LMCA | 54.3% | 26.5% |
| Epoch Capabilities Index | 159.1 | 145.64 |
| ForecastBench | 60.6 | 61.8 |
| NYT Connections (extended) | 96.2% | — |
| EnigmaEval | — | 9.2% |
| EBR-Bench | 34.3% | — |
| Surface Evolver Bench | 88.1% | — |
| Bench to the Future 3 | 0.14 | — |
Math GPT-5.5 leads
GPT-5.5: 81.7 (#11), o4-mini: 40.8 (#89)
| Benchmark | GPT-5.5 | o4-mini |
|---|---|---|
| FrontierMath (Tiers 1-3) | 85.3% | 36.1% |
| FrontierMath Tier 4 | 72.5% | 4.9% |
| OTIS Mock AIME 2024-2025 | 100% | 81.7% |
| LMArena Math | 1486 | 1389 |
| FrontierMath (Feb 2025 set) | 51.7% | 24.8% |
| FrontierMath Tier 4 (v1) | 35.4% | 6.3% |
| MathArena Final-Answer Competitions | 94.3% | — |
| ProofBench | 50% | — |
| Omni-MATH | — | 72% |
| MATH Level 5 | — | 97.8% |
| FrontierMath Erdős | 0% | — |
Knowledge GPT-5.5 leads
GPT-5.5: 64.4 (#17), o4-mini: 43.6 (#91)
| Benchmark | GPT-5.5 | o4-mini |
|---|---|---|
| GPQA Diamond | 94% | 79.6% |
| SimpleQA Verified | 63% | 19.6% |
| Vectara Hallucination Rate | 9.3% | 18.6% |
| LMArena Expert | 1508 | 1343 |
| Humanity's Last Exam | — | 18.1% |
| MMLU-Pro | — | 82% |
| Confabulations | — | 15.8% |
| GPQA (HELM) | — | 73.5% |
Multimodal GPT-5.5 leads
GPT-5.5: 46.9 (#12), o4-mini: 40.2 (#49)
| Benchmark | GPT-5.5 | o4-mini |
|---|---|---|
| LMArena Vision | 1297 | 1194 |
| GeoBench | — | 64% |
| VPCT | — | 57.5% |
| Blueprint-Bench 2 | 36.2% | — |
| Furniture Assembly | 44.2% | — |
| LMArena Document | 1486 | — |
Multilingual GPT-5.5 leads
GPT-5.5: 56.4 (#20), o4-mini: 47.0 (#154)
| Benchmark | GPT-5.5 | o4-mini |
|---|---|---|
| LMArena Non-English | 1467 | 1337 |
| LMArena Chinese | 1533 | 1354 |
| LMArena French | 1486 | 1364 |
| LMArena German | 1480 | 1336 |
| LMArena Japanese | 1498 | 1308 |
| LMArena Korean | 1460 | 1312 |
| LMArena Russian | 1473 | 1334 |
| LMArena Spanish | 1468 | 1347 |
Instruction Following GPT-5.5 leads
GPT-5.5: 77.5 (#18), o4-mini: 75.2 (#68)
| Benchmark | GPT-5.5 | o4-mini |
|---|---|---|
| LMArena Instruction Following | 1479 | 1321 |
| IFEval | — | 92.8% |
Long Context GPT-5.5 leads
GPT-5.5: 48.3 (#12), o4-mini: 45.5 (#33)
| Benchmark | GPT-5.5 | o4-mini |
|---|---|---|
| LMArena Longer Query | 1484 | 1315 |
| Fiction.LiveBench | — | 77.8% |
| CL-bench Life | 22.2% | — |
Writing & Preference GPT-5.5 leads
GPT-5.5: 72.7 (#13), o4-mini: 54.0 (#152)
| Benchmark | GPT-5.5 | o4-mini |
|---|---|---|
| LMArena Text | 1472 | 1353 |
| LMArena Creative Writing | 1455 | 1294 |
| LMArena Multi-Turn | 1476 | 1350 |
| Short-Story Creative Writing | — | 75% |
| EQ-Bench Creative Writing | 1844 | — |
| WildBench | — | 85.4% |
| EQ-Bench 4 | 1315 | — |
Frequently asked questions
Is GPT-5.5 better than o4-mini?
GPT-5.5 is the stronger model overall, scoring 63.4 to 41.6 on the Noometry Index. o4-mini costs 5.8× less per token, which makes it the better buy when GPT-5.5's lead doesn't matter for your workload.
Which is cheaper, GPT-5.5 or o4-mini?
o4-mini is cheaper. It lists at $1.10 per million input tokens and $4.40 per million output tokens; GPT-5.5 lists at $5 and $30.
Is GPT-5.5 or o4-mini better for coding?
GPT-5.5 scores higher on coding benchmarks: 58.2 versus 40.9 in the Noometry coding category.
Which has the bigger context window?
GPT-5.5 does, with 1.05M tokens against 200K.
How many benchmarks do GPT-5.5 and o4-mini share?
40 benchmarks have published results for both models. GPT-5.5 has 71 scored results on Noometry and o4-mini has 60.