Model comparison
GPT-5.5 vs GPT-5.5 Pro
GPT-5.5 and GPT-5.5 Pro score almost the same on the Noometry Index (63.4 vs 64.3), so choose on price, context window or the category you care about most.
Last verified . 14 shared benchmarks.
Summary
- They share 14 benchmarks with published results for both. GPT-5.5 scores higher in 1 category and GPT-5.5 Pro in 2 categories; one gap is clear of the uncertainty.
- The biggest single-benchmark swing is Chess Puzzles: 54% for GPT-5.5 and 64% for GPT-5.5 Pro.
- GPT-5.5 is cheaper at $5 / $30 per million input/output tokens, against $30 / $180 for GPT-5.5 Pro.
Side by side
| GPT-5.5 | GPT-5.5 Pro | |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Noometry Index | 63.4 | 64.3 |
| Released | 2026-04-23 | 2026-04-23 |
| Weights | Proprietary | Proprietary |
| Context window | 1.05M | 1.05M |
| Max output | 128K | 128K |
| Input $ / M tokens | $5 | $30 |
| Output $ / M tokens | $30 | $180 |
| Results tracked | 71 | 14 |
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Category by category
Coding Not comparable
GPT-5.5: 58.2 (#17), GPT-5.5 Pro: —
| Benchmark | GPT-5.5 | GPT-5.5 Pro |
|---|---|---|
| SWE-bench Verified | 80.6% | — |
| DeepSWE | 67% | — |
| FrontierCode | 43% | — |
| LMArena WebDev | 1513 | — |
| SciCode | 56.1% | — |
| GSO | 40.2% | — |
| WeirdML | 84.9% | — |
| LMArena Coding | 1494 | — |
| MirrorCode | 10% | — |
| ALE-Bench | 1,943 | — |
Agentic & Tool Use Not comparable
GPT-5.5: 50.7 (#6), GPT-5.5 Pro: —
| Benchmark | GPT-5.5 | GPT-5.5 Pro |
|---|---|---|
| Terminal-Bench | 84.7% | — |
| APEX-Agents | 55.1% | — |
| OSWorld 2.0 | 13% | — |
| 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 | — |
| Vending-Bench 2 | 7,524 | — |
Reasoning Too close to call
GPT-5.5: 72.8 (#11), GPT-5.5 Pro: 73.3 (#10)
| Benchmark | GPT-5.5 | GPT-5.5 Pro |
|---|---|---|
| ARC-AGI-2 | 85% | 84.6% |
| SimpleBench | 69% | 76.9% |
| ARC-AGI-1 | 95% | 96.5% |
| CritPt | 27.1% | 30.6% |
| Chess Puzzles | 54% | 64% |
| DTBench | 96% | 96% |
| LMCA | 54.3% | 53.9% |
| Epoch Capabilities Index | 159.1 | 162.07 |
| Kagi LLM Benchmark | 88.8% | — |
| NYT Connections (extended) | 96.2% | — |
| EBR-Bench | 34.3% | — |
| LMArena Hard Prompts | 1489 | — |
| Mystery Game Puzzles | 56% | — |
| Surface Evolver Bench | 88.1% | — |
| Bench to the Future 3 | 0.14 | — |
| ForecastBench | 60.6 | — |
Math GPT-5.5 Pro leads
GPT-5.5: 81.7 (#11), GPT-5.5 Pro: 84.0 (#10)
| Benchmark | GPT-5.5 | GPT-5.5 Pro |
|---|---|---|
| FrontierMath (Tiers 1-3) | 85.3% | 87.7% |
| FrontierMath Tier 4 | 72.5% | 78% |
| OTIS Mock AIME 2024-2025 | 100% | 100% |
| FrontierMath (Feb 2025 set) | 51.7% | 52.4% |
| FrontierMath Tier 4 (v1) | 35.4% | 39.6% |
| MathArena Final-Answer Competitions | 94.3% | — |
| ProofBench | 50% | — |
| LMArena Math | 1486 | — |
| FrontierMath Erdős | 0% | — |
Knowledge Too close to call
GPT-5.5: 64.4 (#17), GPT-5.5 Pro: 64.1 (#19)
| Benchmark | GPT-5.5 | GPT-5.5 Pro |
|---|---|---|
| GPQA Diamond | 94% | 93.9% |
| SimpleQA Verified | 63% | — |
| Vectara Hallucination Rate | 9.3% | — |
| LMArena Expert | 1508 | — |
Multimodal Not comparable
GPT-5.5: 46.9 (#12), GPT-5.5 Pro: —
| Benchmark | GPT-5.5 | GPT-5.5 Pro |
|---|---|---|
| LMArena Vision | 1297 | — |
| Blueprint-Bench 2 | 36.2% | — |
| Furniture Assembly | 44.2% | — |
| LMArena Document | 1486 | — |
Multilingual Not comparable
GPT-5.5: 56.4 (#20), GPT-5.5 Pro: —
| Benchmark | GPT-5.5 | GPT-5.5 Pro |
|---|---|---|
| LMArena Non-English | 1467 | — |
| LMArena Chinese | 1533 | — |
| LMArena French | 1486 | — |
| LMArena German | 1480 | — |
| LMArena Japanese | 1498 | — |
| LMArena Korean | 1460 | — |
| LMArena Russian | 1473 | — |
| LMArena Spanish | 1468 | — |
Instruction Following Not comparable
GPT-5.5: 77.5 (#18), GPT-5.5 Pro: —
| Benchmark | GPT-5.5 | GPT-5.5 Pro |
|---|---|---|
| LMArena Instruction Following | 1479 | — |
Long Context Not comparable
GPT-5.5: 48.3 (#12), GPT-5.5 Pro: —
| Benchmark | GPT-5.5 | GPT-5.5 Pro |
|---|---|---|
| CL-bench Life | 22.2% | — |
| LMArena Longer Query | 1484 | — |
Writing & Preference Not comparable
GPT-5.5: 72.7 (#13), GPT-5.5 Pro: —
| Benchmark | GPT-5.5 | GPT-5.5 Pro |
|---|---|---|
| LMArena Text | 1472 | — |
| LMArena Creative Writing | 1455 | — |
| EQ-Bench Creative Writing | 1844 | — |
| EQ-Bench 4 | 1315 | — |
| LMArena Multi-Turn | 1476 | — |
Frequently asked questions
Is GPT-5.5 better than GPT-5.5 Pro?
GPT-5.5 and GPT-5.5 Pro score almost the same on the Noometry Index (63.4 vs 64.3), so choose on price, context window or the category you care about most.
Which is cheaper, GPT-5.5 or GPT-5.5 Pro?
GPT-5.5 is cheaper. It lists at $5 per million input tokens and $30 per million output tokens; GPT-5.5 Pro lists at $30 and $180.
Which has the bigger context window?
Both accept 1.05M tokens.
How many benchmarks do GPT-5.5 and GPT-5.5 Pro share?
14 benchmarks have published results for both models. GPT-5.5 has 71 scored results on Noometry and GPT-5.5 Pro has 14.