Model comparison
Chatgpt 4o Latest 20250326 vs Claude Opus 4.5
Claude Opus 4.5 is the stronger model overall, scoring 50.5 to 43.2 on the Noometry Index.
Last verified . 19 shared benchmarks.
Summary
- They share 19 benchmarks with published results for both. Chatgpt 4o Latest 20250326 scores higher in 1 category and Claude Opus 4.5 in 8 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Claude Opus 4.5 leads 56.4 to 38.7.
- The biggest single-benchmark swing is Kagi LLM Benchmark: 75% for Chatgpt 4o Latest 20250326 and 80.2% for Claude Opus 4.5.
Side by side
| Chatgpt 4o Latest 20250326 | Claude Opus 4.5 | |
|---|---|---|
| Provider | OpenAI | Anthropic |
| Noometry Index | 43.2 | 50.5 |
| Released | — | 2025-11-01 |
| Weights | Proprietary | Proprietary |
| Context window | — | 200K |
| Max output | — | 64K |
| Input $ / M tokens | — | $5 |
| Output $ / M tokens | — | $25 |
| Results tracked | 21 | 69 |
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Category by category
Coding Claude Opus 4.5 leads
Chatgpt 4o Latest 20250326: 41.0 (#122), Claude Opus 4.5: 55.4 (#21)
| Benchmark | Chatgpt 4o Latest 20250326 | Claude Opus 4.5 |
|---|---|---|
| LMArena Coding | 1413 | 1504 |
| SWE-bench Verified | — | 76.7% |
| SWE-bench Verified (bash only) | — | 76.8% |
| LMArena WebDev | — | 1493 |
| SWE-bench Multilingual | — | 70.7% |
| GSO | — | 26.5% |
| WeirdML | — | 63.7% |
| ALE-Bench | — | 1,025 |
| AlgoTune | — | 1.77 |
Agentic & Tool Use Not comparable
Chatgpt 4o Latest 20250326: —, Claude Opus 4.5: 47.2 (#11)
| Benchmark | Chatgpt 4o Latest 20250326 | Claude Opus 4.5 |
|---|---|---|
| Terminal-Bench | — | 63.1% |
| Berkeley Function Calling Leaderboard | — | 77.5% |
| GDPval | — | 45.5% |
| Remote Labor Index | — | 3.8% |
| τ²-bench Airline | — | 84% |
| τ²-bench Banking | — | 24.7% |
| τ²-bench Retail | — | 79.6% |
| τ²-bench Telecom | — | 92.3% |
| Cybench | — | 82% |
| DeepResearch Bench | — | 54.8% |
| OSWorld | — | 66.3% |
| BALROG | — | 43.5% |
| LMArena Search | — | 1180 |
| METR Time Horizons | — | 75% |
| Vending-Bench 2 | — | 4,967 |
Reasoning Claude Opus 4.5 leads
Chatgpt 4o Latest 20250326: 32.8 (#64), Claude Opus 4.5: 42.5 (#43)
| Benchmark | Chatgpt 4o Latest 20250326 | Claude Opus 4.5 |
|---|---|---|
| Kagi LLM Benchmark | 75% | 80.2% |
| LMArena Hard Prompts | 1424 | 1476 |
| ARC-AGI-2 | — | 37.6% |
| SimpleBench | — | 62% |
| NYT Connections (extended) | — | 52.5% |
| ARC-AGI-1 | — | 80% |
| Chess Puzzles | — | 12% |
| EnigmaEval | — | 11.9% |
| EBR-Bench | — | 14.3% |
| Mystery Game Puzzles | — | 22% |
| DTBench | — | 89.9% |
| LMCA | — | 44.5% |
| Epoch Capabilities Index | — | 150.1 |
| ForecastBench | — | 60.7 |
Math Claude Opus 4.5 leads
Chatgpt 4o Latest 20250326: 35.8 (#134), Claude Opus 4.5: 38.5 (#85)
| Benchmark | Chatgpt 4o Latest 20250326 | Claude Opus 4.5 |
|---|---|---|
| LMArena Math | 1407 | 1463 |
| FrontierMath (Tiers 1-3) | — | 34.4% |
| FrontierMath Tier 4 | — | 4.9% |
| OTIS Mock AIME 2024-2025 | — | 86.1% |
| ProofBench | — | 36% |
| FrontierMath (Feb 2025 set) | — | 20.7% |
| FrontierMath Tier 4 (v1) | — | 4.2% |
Knowledge Claude Opus 4.5 leads
Chatgpt 4o Latest 20250326: 38.7 (#131), Claude Opus 4.5: 56.4 (#38)
| Benchmark | Chatgpt 4o Latest 20250326 | Claude Opus 4.5 |
|---|---|---|
| LMArena Expert | 1400 | 1488 |
| GPQA Diamond | — | 86% |
| Humanity's Last Exam | — | 25.2% |
| SimpleQA Verified | — | 45.7% |
| Confabulations | 16.6% | — |
| Vectara Hallucination Rate | — | 10.9% |
Multimodal Chatgpt 4o Latest 20250326 leads
Chatgpt 4o Latest 20250326: 38.9 (#54), Claude Opus 4.5: 31.1 (#99)
| Benchmark | Chatgpt 4o Latest 20250326 | Claude Opus 4.5 |
|---|---|---|
| LMArena Vision | 1243 | — |
| GeoBench | — | 75% |
| VPCT | — | 40% |
| Furniture Assembly | — | 28.3% |
| LMArena Document | — | 1462 |
Multilingual Claude Opus 4.5 leads
Chatgpt 4o Latest 20250326: 53.1 (#72), Claude Opus 4.5: 54.5 (#45)
| Benchmark | Chatgpt 4o Latest 20250326 | Claude Opus 4.5 |
|---|---|---|
| LMArena Non-English | 1419 | 1438 |
| LMArena Chinese | 1456 | 1470 |
| LMArena French | 1447 | 1471 |
| LMArena German | 1424 | 1449 |
| LMArena Japanese | 1406 | 1415 |
| LMArena Korean | 1397 | 1424 |
| LMArena Russian | 1429 | 1448 |
| LMArena Spanish | 1435 | 1455 |
Instruction Following Claude Opus 4.5 leads
Chatgpt 4o Latest 20250326: 74.2 (#102), Claude Opus 4.5: 77.7 (#20)
| Benchmark | Chatgpt 4o Latest 20250326 | Claude Opus 4.5 |
|---|---|---|
| LMArena Instruction Following | 1403 | 1478 |
Long Context Claude Opus 4.5 leads
Chatgpt 4o Latest 20250326: 43.1 (#104), Claude Opus 4.5: 46.4 (#21)
| Benchmark | Chatgpt 4o Latest 20250326 | Claude Opus 4.5 |
|---|---|---|
| LMArena Longer Query | 1413 | 1480 |
| CL-bench | — | 21.1% |
Writing & Preference Claude Opus 4.5 leads
Chatgpt 4o Latest 20250326: 62.8 (#68), Claude Opus 4.5: 68.2 (#28)
| Benchmark | Chatgpt 4o Latest 20250326 | Claude Opus 4.5 |
|---|---|---|
| LMArena Text | 1429 | 1451 |
| LMArena Creative Writing | 1406 | 1445 |
| EQ-Bench Creative Writing | 1501 | 1687 |
| LMArena Multi-Turn | 1454 | 1466 |
Frequently asked questions
Is Chatgpt 4o Latest 20250326 better than Claude Opus 4.5?
Claude Opus 4.5 is the stronger model overall, scoring 50.5 to 43.2 on the Noometry Index.
Is Chatgpt 4o Latest 20250326 or Claude Opus 4.5 better for coding?
Claude Opus 4.5 scores higher on coding benchmarks: 55.4 versus 41.0 in the Noometry coding category.
How many benchmarks do Chatgpt 4o Latest 20250326 and Claude Opus 4.5 share?
19 benchmarks have published results for both models. Chatgpt 4o Latest 20250326 has 21 scored results on Noometry and Claude Opus 4.5 has 69.