Model comparison
Chatgpt 4o Latest 20250326 vs Claude Fable 5.1
Claude Fable 5.1 is the stronger model overall, scoring 68.5 to 43.2 on the Noometry Index.
Last verified . 18 shared benchmarks.
Summary
- They share 18 benchmarks with published results for both. Chatgpt 4o Latest 20250326 scores higher in 0 categories and Claude Fable 5.1 in 9 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in math, where Claude Fable 5.1 leads 89.5 to 35.8.
Side by side
| Chatgpt 4o Latest 20250326 | Claude Fable 5.1 | |
|---|---|---|
| Provider | OpenAI | Anthropic |
| Noometry Index | 43.2 | 68.5 |
| Released | — | 2026-09-01 |
| Weights | Proprietary | Proprietary |
| Context window | — | 1M |
| Max output | — | 128K |
| Input $ / M tokens | — | $10 |
| Output $ / M tokens | — | $50 |
| Results tracked | 21 | 50 |
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Category by category
Coding Claude Fable 5.1 leads
Chatgpt 4o Latest 20250326: 41.0 (#122), Claude Fable 5.1: 70.5 (#2)
| Benchmark | Chatgpt 4o Latest 20250326 | Claude Fable 5.1 |
|---|---|---|
| LMArena Coding | 1413 | 1523 |
| FrontierCode | — | 50.9% |
| CursorBench | — | 51.8% |
| LMArena WebDev | — | 1753 |
| FrontierSWE | — | 56.3% |
| SciCode | — | 63.1% |
| WeirdML | — | 92.9% |
| MirrorCode | — | 73.3% |
| ALE-Bench | — | 2,143 |
Agentic & Tool Use Not comparable
Chatgpt 4o Latest 20250326: —, Claude Fable 5.1: 50.8 (#5)
| Benchmark | Chatgpt 4o Latest 20250326 | Claude Fable 5.1 |
|---|---|---|
| APEX-Agents | — | 68.6% |
| Remote Labor Index | — | 17.9% |
| GDP.pdf | — | 29.6% |
| Vending-Bench 2 | — | 5,422 |
Reasoning Claude Fable 5.1 leads
Chatgpt 4o Latest 20250326: 32.8 (#64), Claude Fable 5.1: 76.7 (#5)
| Benchmark | Chatgpt 4o Latest 20250326 | Claude Fable 5.1 |
|---|---|---|
| LMArena Hard Prompts | 1424 | 1526 |
| ARC-AGI-2 | — | 90% |
| Kagi LLM Benchmark | 75% | — |
| NYT Connections (extended) | — | 90% |
| ARC-AGI-1 | — | 97.5% |
| CritPt | — | 31.1% |
| Chess Puzzles | — | 47% |
| EBR-Bench | — | 57.1% |
| Mystery Game Puzzles | — | 58% |
| DTBench | — | 97.6% |
| LMCA | — | 65.5% |
| Epoch Capabilities Index | — | 165 |
Math Claude Fable 5.1 leads
Chatgpt 4o Latest 20250326: 35.8 (#134), Claude Fable 5.1: 89.5 (#3)
| Benchmark | Chatgpt 4o Latest 20250326 | Claude Fable 5.1 |
|---|---|---|
| LMArena Math | 1407 | 1519 |
| FrontierMath (Tiers 1-3) | — | 90.2% |
| FrontierMath Tier 4 | — | 87.8% |
| OTIS Mock AIME 2024-2025 | — | 100% |
| ProofBench | — | 100% |
| FrontierMath Erdős | — | 0% |
Knowledge Claude Fable 5.1 leads
Chatgpt 4o Latest 20250326: 38.7 (#131), Claude Fable 5.1: 69.3 (#5)
| Benchmark | Chatgpt 4o Latest 20250326 | Claude Fable 5.1 |
|---|---|---|
| LMArena Expert | 1400 | 1528 |
| Humanity's Last Exam | — | 46.5% |
| SimpleQA Verified | — | 70.8% |
| Confabulations | 16.6% | — |
Multimodal Claude Fable 5.1 leads
Chatgpt 4o Latest 20250326: 38.9 (#54), Claude Fable 5.1: 54.1 (#4)
| Benchmark | Chatgpt 4o Latest 20250326 | Claude Fable 5.1 |
|---|---|---|
| LMArena Vision | 1243 | 1319 |
| Blueprint-Bench 2 | — | 41.9% |
| Furniture Assembly | — | 70% |
| LMArena Document | — | 1513 |
Multilingual Claude Fable 5.1 leads
Chatgpt 4o Latest 20250326: 53.1 (#72), Claude Fable 5.1: 59.5 (#2)
| Benchmark | Chatgpt 4o Latest 20250326 | Claude Fable 5.1 |
|---|---|---|
| LMArena Non-English | 1419 | 1509 |
| LMArena Chinese | 1456 | 1589 |
| LMArena French | 1447 | 1532 |
| LMArena German | 1424 | 1495 |
| LMArena Japanese | 1406 | 1565 |
| LMArena Russian | 1429 | 1525 |
| LMArena Spanish | 1435 | 1503 |
| LMArena Korean | 1397 | — |
Instruction Following Claude Fable 5.1 leads
Chatgpt 4o Latest 20250326: 74.2 (#102), Claude Fable 5.1: 79.3 (#6)
| Benchmark | Chatgpt 4o Latest 20250326 | Claude Fable 5.1 |
|---|---|---|
| LMArena Instruction Following | 1403 | 1515 |
Long Context Claude Fable 5.1 leads
Chatgpt 4o Latest 20250326: 43.1 (#104), Claude Fable 5.1: 46.8 (#19)
| Benchmark | Chatgpt 4o Latest 20250326 | Claude Fable 5.1 |
|---|---|---|
| LMArena Longer Query | 1413 | 1524 |
Writing & Preference Claude Fable 5.1 leads
Chatgpt 4o Latest 20250326: 62.8 (#68), Claude Fable 5.1: 79.3 (#1)
| Benchmark | Chatgpt 4o Latest 20250326 | Claude Fable 5.1 |
|---|---|---|
| LMArena Text | 1429 | 1511 |
| LMArena Creative Writing | 1406 | 1507 |
| EQ-Bench Creative Writing | 1501 | 2162 |
| LMArena Multi-Turn | 1454 | 1492 |
Frequently asked questions
Is Chatgpt 4o Latest 20250326 better than Claude Fable 5.1?
Claude Fable 5.1 is the stronger model overall, scoring 68.5 to 43.2 on the Noometry Index.
Is Chatgpt 4o Latest 20250326 or Claude Fable 5.1 better for coding?
Claude Fable 5.1 scores higher on coding benchmarks: 70.5 versus 41.0 in the Noometry coding category.
How many benchmarks do Chatgpt 4o Latest 20250326 and Claude Fable 5.1 share?
18 benchmarks have published results for both models. Chatgpt 4o Latest 20250326 has 21 scored results on Noometry and Claude Fable 5.1 has 50.