Model comparison
Chatgpt 4o Latest 20250326 vs Claude Opus 5.5
Claude Opus 5.5 is the stronger model overall, scoring 68.6 to 43.8 on the Noometry Index.
Last verified . 16 shared benchmarks.
Summary
- They share 16 benchmarks with published results for both. Chatgpt 4o Latest 20250326 scores higher in 0 categories and Claude Opus 5.5 in 9 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in math, where Claude Opus 5.5 leads 91.8 to 38.6.
Side by side
| Chatgpt 4o Latest 20250326 | Claude Opus 5.5 | |
|---|---|---|
| Provider | OpenAI | Anthropic |
| Noometry Index | 43.8 | 68.6 |
| Released | — | 2026-09-22 |
| Weights | Proprietary | Proprietary |
| Context window | — | 1M |
| Max output | — | 128K |
| Input $ / M tokens | — | $4 |
| Output $ / M tokens | — | $20 |
| Results tracked | 21 | 44 |
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Category by category
Coding Claude Opus 5.5 leads
Chatgpt 4o Latest 20250326: 41.6 (#122), Claude Opus 5.5: 71.9 (#3)
| Benchmark | Chatgpt 4o Latest 20250326 | Claude Opus 5.5 |
|---|---|---|
| LMArena Coding | 1413 | 1547 |
| FrontierCode | — | 54.6% |
| CursorBench | — | 57.8% |
| LMArena WebDev | — | 1813 |
| FrontierSWE | — | 62.3% |
| SciCode | — | 66.9% |
| MirrorCode | — | 77.4% |
| ALE-Bench | — | 2,147 |
Agentic & Tool Use Not comparable
Chatgpt 4o Latest 20250326: —, Claude Opus 5.5: 45.3 (#15)
| Benchmark | Chatgpt 4o Latest 20250326 | Claude Opus 5.5 |
|---|---|---|
| APEX-Agents | — | 73.5% |
| GDP.pdf | — | 30.6% |
| Vending-Bench 2 | — | 9,235 |
Reasoning Claude Opus 5.5 leads
Chatgpt 4o Latest 20250326: 33.8 (#71), Claude Opus 5.5: 80.2 (#3)
| Benchmark | Chatgpt 4o Latest 20250326 | Claude Opus 5.5 |
|---|---|---|
| LMArena Hard Prompts | 1424 | 1535 |
| ARC-AGI-2 | — | 93.3% |
| Kagi LLM Benchmark | 75% | — |
| NYT Connections (extended) | — | 88.5% |
| ARC-AGI-1 | — | 98.5% |
| CritPt | — | 31.7% |
| EBR-Bench | — | 71.4% |
| Mystery Game Puzzles | — | 71% |
| DTBench | — | 98.9% |
| LMCA | — | 68.2% |
| Epoch Capabilities Index | — | 167.33 |
Math Claude Opus 5.5 leads
Chatgpt 4o Latest 20250326: 38.6 (#134), Claude Opus 5.5: 91.8 (#3)
| Benchmark | Chatgpt 4o Latest 20250326 | Claude Opus 5.5 |
|---|---|---|
| LMArena Math | 1407 | 1506 |
| FrontierMath (Tiers 1-3) | — | 91.2% |
| FrontierMath Tier 4 | — | 95% |
| OTIS Mock AIME 2024-2025 | — | 100% |
| ProofBench | — | 100% |
| FrontierMath Erdős | — | 2.9% |
Knowledge Claude Opus 5.5 leads
Chatgpt 4o Latest 20250326: 39.2 (#137), Claude Opus 5.5: 66.4 (#10)
| Benchmark | Chatgpt 4o Latest 20250326 | Claude Opus 5.5 |
|---|---|---|
| LMArena Expert | 1401 | 1547 |
| GPQA Diamond | — | 90.6% |
| SimpleQA Verified | — | 72.2% |
| Confabulations | 16.6% | — |
Multimodal Claude Opus 5.5 leads
Chatgpt 4o Latest 20250326: 39.6 (#58), Claude Opus 5.5: 57.8 (#1)
| Benchmark | Chatgpt 4o Latest 20250326 | Claude Opus 5.5 |
|---|---|---|
| LMArena Vision | 1243 | 1321 |
| Blueprint-Bench 2 | — | 51.2% |
| Furniture Assembly | — | 83.3% |
Multilingual Claude Opus 5.5 leads
Chatgpt 4o Latest 20250326: 52.9 (#76), Claude Opus 5.5: 59.1 (#2)
| Benchmark | Chatgpt 4o Latest 20250326 | Claude Opus 5.5 |
|---|---|---|
| LMArena Non-English | 1419 | 1507 |
| LMArena Chinese | 1457 | 1588 |
| LMArena French | 1446 | 1514 |
| LMArena Russian | 1429 | 1520 |
| LMArena Spanish | 1434 | 1507 |
| LMArena German | 1423 | — |
| LMArena Japanese | 1405 | — |
| LMArena Korean | 1396 | — |
Instruction Following Claude Opus 5.5 leads
Chatgpt 4o Latest 20250326: 74.0 (#107), Claude Opus 5.5: 80.0 (#3)
| Benchmark | Chatgpt 4o Latest 20250326 | Claude Opus 5.5 |
|---|---|---|
| LMArena Instruction Following | 1403 | 1537 |
Long Context Claude Opus 5.5 leads
Chatgpt 4o Latest 20250326: 43.1 (#107), Claude Opus 5.5: 47.1 (#19)
| Benchmark | Chatgpt 4o Latest 20250326 | Claude Opus 5.5 |
|---|---|---|
| LMArena Longer Query | 1413 | 1532 |
Writing & Preference Claude Opus 5.5 leads
Chatgpt 4o Latest 20250326: 62.6 (#72), Claude Opus 5.5: 78.2 (#3)
| Benchmark | Chatgpt 4o Latest 20250326 | Claude Opus 5.5 |
|---|---|---|
| LMArena Text | 1429 | 1515 |
| LMArena Creative Writing | 1405 | 1533 |
| EQ-Bench Creative Writing | 1501 | 2050 |
| LMArena Multi-Turn | 1454 | 1499 |
Frequently asked questions
Is Chatgpt 4o Latest 20250326 better than Claude Opus 5.5?
Claude Opus 5.5 is the stronger model overall, scoring 68.6 to 43.8 on the Noometry Index.
Is Chatgpt 4o Latest 20250326 or Claude Opus 5.5 better for coding?
Claude Opus 5.5 scores higher on coding benchmarks: 71.9 versus 41.6 in the Noometry coding category.
How many benchmarks do Chatgpt 4o Latest 20250326 and Claude Opus 5.5 share?
16 benchmarks have published results for both models. Chatgpt 4o Latest 20250326 has 21 scored results on Noometry and Claude Opus 5.5 has 44.