Model comparison
GPT-5.5 Pro vs GPT-5 Mini
GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 41.8 on the Noometry Index. GPT-5 Mini costs 98× less per token, which makes it the better buy when GPT-5.5 Pro's lead doesn't matter for your workload.
Last verified . 13 shared benchmarks.
Summary
- They share 13 benchmarks with published results for both. GPT-5.5 Pro scores higher in 3 categories and GPT-5 Mini 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 23.9.
- The biggest single-benchmark swing is ARC-AGI-2: 84.6% for GPT-5.5 Pro and 4.4% for GPT-5 Mini.
- GPT-5 Mini is cheaper at $0.25 / $2 per million input/output tokens, against $30 / $180 for GPT-5.5 Pro.
- GPT-5.5 Pro accepts more context: 1.05M tokens versus 400K.
Side by side
| GPT-5.5 Pro | GPT-5 Mini | |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Noometry Index | 64.3 | 41.8 |
| Released | 2026-04-23 | 2025-08-07 |
| Weights | Proprietary | Proprietary |
| Context window | 1.05M | 400K |
| Max output | 128K | 128K |
| Input $ / M tokens | $30 | $0.25 |
| Output $ / M tokens | $180 | $2 |
| Results tracked | 14 | 60 |
Sponsored placements are available on pages like this one. Advertise on Noometry
Category by category
Coding Not comparable
GPT-5.5 Pro: —, GPT-5 Mini: 40.1 (#146)
| Benchmark | GPT-5.5 Pro | GPT-5 Mini |
|---|---|---|
| SWE-bench Verified | — | 64.7% |
| SWE-bench Verified (bash only) | — | 59.8% |
| SWE-bench Multilingual | — | 39.7% |
| SciCode | — | 39.2% |
| WeirdML | — | 52.7% |
| LMArena Coding | — | 1406 |
| ALE-Bench | — | 799.77 |
| AlgoTune | — | 1.38 |
Agentic & Tool Use Not comparable
GPT-5.5 Pro: —, GPT-5 Mini: 31.1 (#70)
| Benchmark | GPT-5.5 Pro | GPT-5 Mini |
|---|---|---|
| Terminal-Bench | — | 34.8% |
| Berkeley Function Calling Leaderboard | — | 55.5% |
| Vending-Bench 2 | — | -31.18 |
Reasoning GPT-5.5 Pro leads
GPT-5.5 Pro: 73.3 (#10), GPT-5 Mini: 23.9 (#168)
| Benchmark | GPT-5.5 Pro | GPT-5 Mini |
|---|---|---|
| ARC-AGI-2 | 84.6% | 4.4% |
| ARC-AGI-1 | 96.5% | 54.3% |
| CritPt | 30.6% | 0% |
| Chess Puzzles | 64% | 30% |
| DTBench | 96% | 80.5% |
| LMCA | 53.9% | 34.2% |
| Epoch Capabilities Index | 162.07 | 145.52 |
| SimpleBench | 76.9% | — |
| Kagi LLM Benchmark | — | 70.3% |
| EnigmaEval | — | 8.2% |
| LMArena Hard Prompts | — | 1380 |
| Mystery Game Puzzles | — | 10% |
| ForecastBench | — | 61 |
Math GPT-5.5 Pro leads
GPT-5.5 Pro: 84.0 (#10), GPT-5 Mini: 46.7 (#69)
| Benchmark | GPT-5.5 Pro | GPT-5 Mini |
|---|---|---|
| FrontierMath (Tiers 1-3) | 87.7% | 46.7% |
| FrontierMath Tier 4 | 78% | 12.2% |
| OTIS Mock AIME 2024-2025 | 100% | 86.7% |
| FrontierMath (Feb 2025 set) | 52.4% | 27.2% |
| FrontierMath Tier 4 (v1) | 39.6% | 6.3% |
| ProofBench | — | 9% |
| Omni-MATH | — | 72.2% |
| LMArena Math | — | 1378 |
| MATH Level 5 | — | 97.8% |
Knowledge GPT-5.5 Pro leads
GPT-5.5 Pro: 64.1 (#19), GPT-5 Mini: 45.6 (#86)
| Benchmark | GPT-5.5 Pro | GPT-5 Mini |
|---|---|---|
| GPQA Diamond | 93.9% | 75% |
| Humanity's Last Exam | — | 19.4% |
| SimpleQA Verified | — | 21.6% |
| MMLU-Pro | — | 83.5% |
| Confabulations | — | 13.3% |
| Vectara Hallucination Rate | — | 12.9% |
| GPQA (HELM) | — | 75.6% |
| LMArena Expert | — | 1379 |
Multimodal Not comparable
GPT-5.5 Pro: —, GPT-5 Mini: 35.6 (#85)
| Benchmark | GPT-5.5 Pro | GPT-5 Mini |
|---|---|---|
| LMArena Vision | — | 1202 |
| VPCT | — | 40.2% |
Multilingual Not comparable
GPT-5.5 Pro: —, GPT-5 Mini: 48.9 (#137)
| Benchmark | GPT-5.5 Pro | GPT-5 Mini |
|---|---|---|
| LMArena Non-English | — | 1363 |
| LMArena Chinese | — | 1385 |
| LMArena French | — | 1386 |
| LMArena German | — | 1366 |
| LMArena Japanese | — | 1341 |
| LMArena Korean | — | 1308 |
| LMArena Russian | — | 1362 |
| LMArena Spanish | — | 1355 |
Instruction Following Not comparable
GPT-5.5 Pro: —, GPT-5 Mini: 76.2 (#46)
| Benchmark | GPT-5.5 Pro | GPT-5 Mini |
|---|---|---|
| IFEval | — | 92.7% |
| LMArena Instruction Following | — | 1357 |
Long Context Not comparable
GPT-5.5 Pro: —, GPT-5 Mini: 41.9 (#132)
| Benchmark | GPT-5.5 Pro | GPT-5 Mini |
|---|---|---|
| Fiction.LiveBench | — | 69.4% |
| LMArena Longer Query | — | 1355 |
Writing & Preference Not comparable
GPT-5.5 Pro: —, GPT-5 Mini: 55.2 (#148)
| Benchmark | GPT-5.5 Pro | GPT-5 Mini |
|---|---|---|
| LMArena Text | — | 1373 |
| LMArena Creative Writing | — | 1325 |
| Short-Story Creative Writing | — | 83.1% |
| EQ-Bench Creative Writing | — | 1313 |
| WildBench | — | 85.5% |
| LMArena Multi-Turn | — | 1363 |
Frequently asked questions
Is GPT-5.5 Pro better than GPT-5 Mini?
GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 41.8 on the Noometry Index. GPT-5 Mini costs 98× 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 GPT-5 Mini?
GPT-5 Mini is cheaper. It lists at $0.25 per million input tokens and $2 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 400K.
How many benchmarks do GPT-5.5 Pro and GPT-5 Mini share?
13 benchmarks have published results for both models. GPT-5.5 Pro has 14 scored results on Noometry and GPT-5 Mini has 60.