# Chatgpt 4o Latest 20250326 vs Claude Fable 5

> Claude Fable 5 is the stronger model overall, scoring 66.3 to 43.2 on the Noometry Index.

- Canonical page: https://noometry.com/compare/chatgpt-4o-vs-claude-fable-5
- Last updated: 2026-10-10
- Shared benchmarks: 20

## Summary

- They share 20 benchmarks with published results for both. Chatgpt 4o Latest 20250326 scores higher in 0 categories and Claude Fable 5 in 9 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in math, where Claude Fable 5 leads 88.4 to 35.8.
- The biggest single-benchmark swing is Kagi LLM Benchmark: 75% for Chatgpt 4o Latest 20250326 and 91.4% for Claude Fable 5.

## Snapshot

| | Chatgpt 4o Latest 20250326 | Claude Fable 5 |
|---|---|---|
| Provider | OpenAI | Anthropic |
| Noometry Index | 43.2 | 66.3 |
| Rank | 84 | 5 |
| Context | — | 1M |
| Input $/M | — | $10 |
| Output $/M | — | $50 |
| Weights | Proprietary | Proprietary |

## Coding

- Chatgpt 4o Latest 20250326: 41.0 (#122)
- Claude Fable 5: 67.0 (#4)

| Benchmark | Chatgpt 4o Latest 20250326 | Claude Fable 5 |
|---|---|---|
| LMArena Coding | 1413 | 1519 |
| DeepSWE | — | 69.9% |
| FrontierCode | — | 53.5% |
| LMArena WebDev | — | 1626 |
| FrontierSWE | — | 47% |
| SciCode | — | 61% |
| WeirdML | — | 91.9% |
| MirrorCode | — | 63.9% |
| ALE-Bench | — | 2,041 |

## Agentic & Tool Use

- Chatgpt 4o Latest 20250326: —
- Claude Fable 5: 54.1 (#2)

| Benchmark | Chatgpt 4o Latest 20250326 | Claude Fable 5 |
|---|---|---|
| APEX-Agents | — | 63.6% |
| Remote Labor Index | — | 16.1% |
| τ²-bench Banking | — | 39.7% |
| PostTrainBench | — | 41.8% |
| GBAEval | — | 74.5% |
| GDP.pdf | — | 30% |
| LMArena Search | — | 1230 |
| Vending-Bench 2 | — | 5,680 |

## Reasoning

- Chatgpt 4o Latest 20250326: 32.8 (#64)
- Claude Fable 5: 76.8 (#4)

| Benchmark | Chatgpt 4o Latest 20250326 | Claude Fable 5 |
|---|---|---|
| Kagi LLM Benchmark | 75% | 91.4% |
| LMArena Hard Prompts | 1424 | 1508 |
| ARC-AGI-2 | — | 89.2% |
| SimpleBench | — | 81.9% |
| NYT Connections (extended) | — | 92.7% |
| ARC-AGI-1 | — | 98.5% |
| CritPt | — | 28.6% |
| Chess Puzzles | — | 41% |
| EnigmaEval | — | 39.3% |
| EBR-Bench | — | 39.5% |
| Mystery Game Puzzles | — | 52% |
| DTBench | — | 98.4% |
| LMCA | — | 61.1% |
| Surface Evolver Bench | — | 95% |
| Bench to the Future 3 | — | 0.13 |
| Epoch Capabilities Index | — | 163.6 |

## Math

- Chatgpt 4o Latest 20250326: 35.8 (#134)
- Claude Fable 5: 88.4 (#5)

| Benchmark | Chatgpt 4o Latest 20250326 | Claude Fable 5 |
|---|---|---|
| LMArena Math | 1407 | 1519 |
| FrontierMath (Tiers 1-3) | — | 87% |
| FrontierMath Tier 4 | — | 90.2% |
| OTIS Mock AIME 2024-2025 | — | 100% |
| ProofBench | — | 95% |
| FrontierMath Erdős | — | 0% |

## Knowledge

- Chatgpt 4o Latest 20250326: 38.7 (#131)
- Claude Fable 5: 62.3 (#22)

| Benchmark | Chatgpt 4o Latest 20250326 | Claude Fable 5 |
|---|---|---|
| LMArena Expert | 1400 | 1534 |
| GPQA Diamond | — | 85.9% |
| SimpleQA Verified | — | 70.7% |
| Confabulations | 16.6% | — |

## Multimodal

- Chatgpt 4o Latest 20250326: 38.9 (#54)
- Claude Fable 5: 45.6 (#14)

| Benchmark | Chatgpt 4o Latest 20250326 | Claude Fable 5 |
|---|---|---|
| LMArena Vision | 1243 | 1326 |
| Blueprint-Bench 2 | — | 38.6% |
| Furniture Assembly | — | 35.8% |
| LMArena Document | — | 1496 |

## Multilingual

- Chatgpt 4o Latest 20250326: 53.1 (#72)
- Claude Fable 5: 57.6 (#8)

| Benchmark | Chatgpt 4o Latest 20250326 | Claude Fable 5 |
|---|---|---|
| LMArena Non-English | 1419 | 1483 |
| LMArena Chinese | 1456 | 1546 |
| LMArena French | 1447 | 1509 |
| LMArena German | 1424 | 1486 |
| LMArena Japanese | 1406 | 1507 |
| LMArena Korean | 1397 | 1493 |
| LMArena Russian | 1429 | 1507 |
| LMArena Spanish | 1435 | 1503 |

## Instruction Following

- Chatgpt 4o Latest 20250326: 74.2 (#102)
- Claude Fable 5: 78.8 (#7)

| Benchmark | Chatgpt 4o Latest 20250326 | Claude Fable 5 |
|---|---|---|
| LMArena Instruction Following | 1403 | 1503 |

## Long Context

- Chatgpt 4o Latest 20250326: 43.1 (#104)
- Claude Fable 5: 46.3 (#22)

| Benchmark | Chatgpt 4o Latest 20250326 | Claude Fable 5 |
|---|---|---|
| LMArena Longer Query | 1413 | 1510 |

## Writing & Preference

- Chatgpt 4o Latest 20250326: 62.8 (#68)
- Claude Fable 5: 76.1 (#5)

| Benchmark | Chatgpt 4o Latest 20250326 | Claude Fable 5 |
|---|---|---|
| LMArena Text | 1429 | 1491 |
| LMArena Creative Writing | 1406 | 1494 |
| EQ-Bench Creative Writing | 1501 | 1943 |
| LMArena Multi-Turn | 1454 | 1505 |
| EQ-Bench 4 | — | 1340 |

## FAQ

### Is Chatgpt 4o Latest 20250326 better than Claude Fable 5?

Claude Fable 5 is the stronger model overall, scoring 66.3 to 43.2 on the Noometry Index.

### Is Chatgpt 4o Latest 20250326 or Claude Fable 5 better for coding?

Claude Fable 5 scores higher on coding benchmarks: 67.0 versus 41.0 in the Noometry coding category.

### How many benchmarks do Chatgpt 4o Latest 20250326 and Claude Fable 5 share?

20 benchmarks have published results for both models. Chatgpt 4o Latest 20250326 has 21 scored results on Noometry and Claude Fable 5 has 61.