Model comparison
Chatgpt 4o Latest 20250326 vs GPT-5.5 Pro
GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 43.8 on the Noometry Index.
Last verified . 0 shared benchmarks.
Summary
- The widest gap is in math, where GPT-5.5 Pro leads 84.0 to 38.6.
Side by side
| Chatgpt 4o Latest 20250326 | GPT-5.5 Pro | |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Noometry Index | 43.8 | 64.3 |
| Released | — | 2026-04-23 |
| Weights | Proprietary | Proprietary |
| Context window | — | 1.05M |
| Max output | — | 128K |
| Input $ / M tokens | — | $30 |
| Output $ / M tokens | — | $180 |
| Results tracked | 21 | 14 |
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Category by category
Coding Not comparable
Chatgpt 4o Latest 20250326: 41.6 (#122), GPT-5.5 Pro: —
| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5.5 Pro |
|---|---|---|
| LMArena Coding | 1413 | — |
Reasoning GPT-5.5 Pro leads
Chatgpt 4o Latest 20250326: 33.8 (#71), GPT-5.5 Pro: 73.3 (#10)
| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5.5 Pro |
|---|---|---|
| ARC-AGI-2 | — | 84.6% |
| SimpleBench | — | 76.9% |
| Kagi LLM Benchmark | 75% | — |
| ARC-AGI-1 | — | 96.5% |
| CritPt | — | 30.6% |
| Chess Puzzles | — | 64% |
| LMArena Hard Prompts | 1424 | — |
| DTBench | — | 96% |
| LMCA | — | 53.9% |
| Epoch Capabilities Index | — | 162.07 |
Math GPT-5.5 Pro leads
Chatgpt 4o Latest 20250326: 38.6 (#134), GPT-5.5 Pro: 84.0 (#10)
| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5.5 Pro |
|---|---|---|
| FrontierMath (Tiers 1-3) | — | 87.7% |
| FrontierMath Tier 4 | — | 78% |
| OTIS Mock AIME 2024-2025 | — | 100% |
| LMArena Math | 1407 | — |
| FrontierMath (Feb 2025 set) | — | 52.4% |
| FrontierMath Tier 4 (v1) | — | 39.6% |
Knowledge GPT-5.5 Pro leads
Chatgpt 4o Latest 20250326: 39.2 (#137), GPT-5.5 Pro: 64.1 (#19)
| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5.5 Pro |
|---|---|---|
| GPQA Diamond | — | 93.9% |
| Confabulations | 16.6% | — |
| LMArena Expert | 1401 | — |
Multimodal Not comparable
Chatgpt 4o Latest 20250326: 39.6 (#58), GPT-5.5 Pro: —
| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5.5 Pro |
|---|---|---|
| LMArena Vision | 1243 | — |
Multilingual Not comparable
Chatgpt 4o Latest 20250326: 52.9 (#76), GPT-5.5 Pro: —
| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5.5 Pro |
|---|---|---|
| LMArena Non-English | 1419 | — |
| LMArena Chinese | 1457 | — |
| LMArena French | 1446 | — |
| LMArena German | 1423 | — |
| LMArena Japanese | 1405 | — |
| LMArena Korean | 1396 | — |
| LMArena Russian | 1429 | — |
| LMArena Spanish | 1434 | — |
Instruction Following Not comparable
Chatgpt 4o Latest 20250326: 74.0 (#107), GPT-5.5 Pro: —
| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5.5 Pro |
|---|---|---|
| LMArena Instruction Following | 1403 | — |
Long Context Not comparable
Chatgpt 4o Latest 20250326: 43.1 (#107), GPT-5.5 Pro: —
| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5.5 Pro |
|---|---|---|
| LMArena Longer Query | 1413 | — |
Writing & Preference Not comparable
Chatgpt 4o Latest 20250326: 62.6 (#72), GPT-5.5 Pro: —
| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5.5 Pro |
|---|---|---|
| LMArena Text | 1429 | — |
| LMArena Creative Writing | 1405 | — |
| EQ-Bench Creative Writing | 1501 | — |
| LMArena Multi-Turn | 1454 | — |
Frequently asked questions
Is Chatgpt 4o Latest 20250326 better than GPT-5.5 Pro?
GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 43.8 on the Noometry Index.
How many benchmarks do Chatgpt 4o Latest 20250326 and GPT-5.5 Pro share?
0 benchmarks have published results for both models. Chatgpt 4o Latest 20250326 has 21 scored results on Noometry and GPT-5.5 Pro has 14.