# Chatgpt 4o Latest 20250326 vs Claude Sonnet 4.5

> Chatgpt 4o Latest 20250326 and Claude Sonnet 4.5 score almost the same on the Noometry Index (43.2 vs 44.0), so choose on price, context window or the category you care about most.

- Canonical page: https://noometry.com/compare/chatgpt-4o-vs-claude-sonnet-4-5
- Last updated: 2026-10-10
- Shared benchmarks: 19

## Summary

- They share 19 benchmarks with published results for both. Chatgpt 4o Latest 20250326 scores higher in 3 categories and Claude Sonnet 4.5 in 6 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Claude Sonnet 4.5 leads 48.4 to 38.7.
- The biggest single-benchmark swing is Kagi LLM Benchmark: 75% for Chatgpt 4o Latest 20250326 and 57.9% for Claude Sonnet 4.5.

## Snapshot

| | Chatgpt 4o Latest 20250326 | Claude Sonnet 4.5 |
|---|---|---|
| Provider | OpenAI | Anthropic |
| Noometry Index | 43.2 | 44.0 |
| Rank | 84 | 76 |
| Context | — | 1M |
| Input $/M | — | $3 |
| Output $/M | — | $15 |
| Weights | Proprietary | Proprietary |

## Coding

- Chatgpt 4o Latest 20250326: 41.0 (#122)
- Claude Sonnet 4.5: 47.8 (#54)

| Benchmark | Chatgpt 4o Latest 20250326 | Claude Sonnet 4.5 |
|---|---|---|
| LMArena Coding | 1413 | 1489 |
| SWE-bench Verified | — | 71.3% |
| SWE-bench Verified (bash only) | — | 71.4% |
| LMArena WebDev | — | 1393 |
| SWE-bench Multilingual | — | 67% |
| SciCode | — | 44.7% |
| GSO | — | 14.7% |
| WeirdML | — | 47.7% |
| ALE-Bench | — | 796.15 |
| AlgoTune | — | 1.52 |

## Agentic & Tool Use

- Chatgpt 4o Latest 20250326: —
- Claude Sonnet 4.5: 38.1 (#30)

| Benchmark | Chatgpt 4o Latest 20250326 | Claude Sonnet 4.5 |
|---|---|---|
| Terminal-Bench | — | 46.5% |
| Berkeley Function Calling Leaderboard | — | 73.2% |
| GDPval | — | 42.5% |
| Remote Labor Index | — | 2.1% |
| τ²-bench Airline | — | 72% |
| τ²-bench Banking | — | 25.3% |
| τ²-bench Retail | — | 72.4% |
| τ²-bench Telecom | — | 84.9% |
| Cybench | — | 60% |
| DeepResearch Bench | — | 52.6% |
| OSWorld | — | 62.9% |
| LMArena Search | — | 1159 |
| METR Time Horizons | — | 67.4% |
| Vending-Bench 2 | — | 3,839 |

## Reasoning

- Chatgpt 4o Latest 20250326: 32.8 (#64)
- Claude Sonnet 4.5: 26.9 (#113)

| Benchmark | Chatgpt 4o Latest 20250326 | Claude Sonnet 4.5 |
|---|---|---|
| Kagi LLM Benchmark | 75% | 57.9% |
| LMArena Hard Prompts | 1424 | 1462 |
| ARC-AGI-2 | — | 13.6% |
| SimpleBench | — | 54.3% |
| NYT Connections (extended) | — | 37.3% |
| ARC-AGI-1 | — | 63.7% |
| CritPt | — | 1.1% |
| Chess Puzzles | — | 12% |
| EnigmaEval | — | 6% |
| EBR-Bench | — | 2.4% |
| Mystery Game Puzzles | — | 17% |
| DTBench | — | 83.2% |
| LMCA | — | 38.8% |
| Epoch Capabilities Index | — | 146.84 |
| ForecastBench | — | 61.9 |

## Math

- Chatgpt 4o Latest 20250326: 35.8 (#134)
- Claude Sonnet 4.5: 31.9 (#190)

| Benchmark | Chatgpt 4o Latest 20250326 | Claude Sonnet 4.5 |
|---|---|---|
| LMArena Math | 1407 | 1448 |
| FrontierMath (Tiers 1-3) | — | 23.9% |
| FrontierMath Tier 4 | — | 2.4% |
| OTIS Mock AIME 2024-2025 | — | 77.8% |
| ProofBench | — | 19% |
| Omni-MATH | — | 55.3% |
| MATH Level 5 | — | 97.7% |
| FrontierMath (Feb 2025 set) | — | 15.2% |
| FrontierMath Tier 4 (v1) | — | 4.2% |

## Knowledge

- Chatgpt 4o Latest 20250326: 38.7 (#131)
- Claude Sonnet 4.5: 48.4 (#70)

| Benchmark | Chatgpt 4o Latest 20250326 | Claude Sonnet 4.5 |
|---|---|---|
| LMArena Expert | 1400 | 1483 |
| GPQA Diamond | — | 82.3% |
| Humanity's Last Exam | — | 13.7% |
| SimpleQA Verified | — | 30.7% |
| MMLU-Pro | — | 86.9% |
| Confabulations | 16.6% | — |
| Vectara Hallucination Rate | — | 12% |
| GPQA (HELM) | — | 68.6% |

## Multimodal

- Chatgpt 4o Latest 20250326: 38.9 (#54)
- Claude Sonnet 4.5: 34.1 (#84)

| Benchmark | Chatgpt 4o Latest 20250326 | Claude Sonnet 4.5 |
|---|---|---|
| LMArena Vision | 1243 | — |
| VPCT | — | 39.8% |
| LMArena Document | — | 1450 |

## Multilingual

- Chatgpt 4o Latest 20250326: 53.1 (#72)
- Claude Sonnet 4.5: 53.6 (#65)

| Benchmark | Chatgpt 4o Latest 20250326 | Claude Sonnet 4.5 |
|---|---|---|
| LMArena Non-English | 1419 | 1425 |
| LMArena Chinese | 1456 | 1459 |
| LMArena French | 1447 | 1459 |
| LMArena German | 1424 | 1427 |
| LMArena Japanese | 1406 | 1390 |
| LMArena Korean | 1397 | 1403 |
| LMArena Russian | 1429 | 1436 |
| LMArena Spanish | 1435 | 1457 |

## Instruction Following

- Chatgpt 4o Latest 20250326: 74.2 (#102)
- Claude Sonnet 4.5: 75.2 (#74)

| Benchmark | Chatgpt 4o Latest 20250326 | Claude Sonnet 4.5 |
|---|---|---|
| LMArena Instruction Following | 1403 | 1459 |
| IFEval | — | 85% |

## Long Context

- Chatgpt 4o Latest 20250326: 43.1 (#104)
- Claude Sonnet 4.5: 45.2 (#45)

| Benchmark | Chatgpt 4o Latest 20250326 | Claude Sonnet 4.5 |
|---|---|---|
| LMArena Longer Query | 1413 | 1476 |

## Writing & Preference

- Chatgpt 4o Latest 20250326: 62.8 (#68)
- Claude Sonnet 4.5: 66.7 (#33)

| Benchmark | Chatgpt 4o Latest 20250326 | Claude Sonnet 4.5 |
|---|---|---|
| LMArena Text | 1429 | 1439 |
| LMArena Creative Writing | 1406 | 1442 |
| EQ-Bench Creative Writing | 1501 | 1678 |
| LMArena Multi-Turn | 1454 | 1465 |
| WildBench | — | 85.4% |

## FAQ

### Is Chatgpt 4o Latest 20250326 better than Claude Sonnet 4.5?

Chatgpt 4o Latest 20250326 and Claude Sonnet 4.5 score almost the same on the Noometry Index (43.2 vs 44.0), so choose on price, context window or the category you care about most.

### Is Chatgpt 4o Latest 20250326 or Claude Sonnet 4.5 better for coding?

Claude Sonnet 4.5 scores higher on coding benchmarks: 47.8 versus 41.0 in the Noometry coding category.

### How many benchmarks do Chatgpt 4o Latest 20250326 and Claude Sonnet 4.5 share?

19 benchmarks have published results for both models. Chatgpt 4o Latest 20250326 has 21 scored results on Noometry and Claude Sonnet 4.5 has 73.