Model comparison
Claude Fable 5.1 vs GPT-4.1
Claude Fable 5.1 is the stronger model overall, scoring 68.5 to 35.7 on the Noometry Index. GPT-4.1 costs 5.7× less per token, which makes it the better buy when Claude Fable 5.1's lead doesn't matter for your workload.
Last verified . 30 shared benchmarks.
Summary
- They share 30 benchmarks with published results for both. Claude Fable 5.1 scores higher in 10 categories and GPT-4.1 in 0 categories; 10 gaps are clear of the uncertainty.
- The widest gap is in math, where Claude Fable 5.1 leads 89.5 to 21.4.
- The biggest single-benchmark swing is ARC-AGI-1: 97.5% for Claude Fable 5.1 and 5.5% for GPT-4.1.
- GPT-4.1 is cheaper at $2 / $8 per million input/output tokens, against $10 / $50 for Claude Fable 5.1.
- GPT-4.1 accepts more context: 1.05M tokens versus 1M.
Side by side
| Claude Fable 5.1 | GPT-4.1 | |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Noometry Index | 68.5 | 35.7 |
| Released | 2026-09-01 | 2025-04-14 |
| Weights | Proprietary | Proprietary |
| Context window | 1M | 1.05M |
| Max output | 128K | 33K |
| Input $ / M tokens | $10 | $2 |
| Output $ / M tokens | $50 | $8 |
| Results tracked | 50 | 52 |
Sponsored placements are available on pages like this one. Advertise on Noometry
Category by category
Coding Claude Fable 5.1 leads
Claude Fable 5.1: 70.5 (#2), GPT-4.1: 34.2 (#228)
| Benchmark | Claude Fable 5.1 | GPT-4.1 |
|---|---|---|
| WeirdML | 92.9% | 39% |
| LMArena Coding | 1523 | 1391 |
| ALE-Bench | 2,143 | 558.1 |
| SWE-bench Verified | — | 48.5% |
| FrontierCode | 50.9% | — |
| SWE-bench Verified (bash only) | — | 39.6% |
| Aider Polyglot | — | 52.4% |
| CursorBench | 51.8% | — |
| LMArena WebDev | 1753 | — |
| FrontierSWE | 56.3% | — |
| SciCode | 63.1% | — |
| MirrorCode | 73.3% | — |
| CadEval | — | 42% |
Agentic & Tool Use Claude Fable 5.1 leads
Claude Fable 5.1: 50.8 (#5), GPT-4.1: 34.4 (#40)
| Benchmark | Claude Fable 5.1 | GPT-4.1 |
|---|---|---|
| APEX-Agents | 68.6% | — |
| Berkeley Function Calling Leaderboard | — | 54% |
| Remote Labor Index | 17.9% | — |
| GDP.pdf | 29.6% | — |
| Vending-Bench 2 | 5,422 | — |
Reasoning Claude Fable 5.1 leads
Claude Fable 5.1: 76.7 (#5), GPT-4.1: 11.7 (#334)
| Benchmark | Claude Fable 5.1 | GPT-4.1 |
|---|---|---|
| ARC-AGI-2 | 90% | 0.4% |
| ARC-AGI-1 | 97.5% | 5.5% |
| Chess Puzzles | 47% | 6% |
| LMArena Hard Prompts | 1526 | 1384 |
| DTBench | 97.6% | 68.3% |
| LMCA | 65.5% | 25.6% |
| Epoch Capabilities Index | 165 | 136.79 |
| SimpleBench | — | 27% |
| Kagi LLM Benchmark | — | 52.3% |
| NYT Connections (extended) | 90% | — |
| CritPt | 31.1% | — |
| EnigmaEval | — | 2.2% |
| EBR-Bench | 57.1% | — |
| Mystery Game Puzzles | 58% | — |
| ForecastBench | — | 61.5 |
Math Claude Fable 5.1 leads
Claude Fable 5.1: 89.5 (#3), GPT-4.1: 21.4 (#269)
| Benchmark | Claude Fable 5.1 | GPT-4.1 |
|---|---|---|
| FrontierMath (Tiers 1-3) | 90.2% | 6% |
| OTIS Mock AIME 2024-2025 | 100% | 38.3% |
| LMArena Math | 1519 | 1369 |
| FrontierMath Tier 4 | 87.8% | — |
| ProofBench | 100% | — |
| Omni-MATH | — | 47.1% |
| MATH Level 5 | — | 83% |
| FrontierMath (Feb 2025 set) | — | 5.5% |
| FrontierMath Erdős | 0% | — |
| FrontierMath Tier 4 (v1) | — | 0% |
Knowledge Claude Fable 5.1 leads
Claude Fable 5.1: 69.3 (#5), GPT-4.1: 37.0 (#152)
| Benchmark | Claude Fable 5.1 | GPT-4.1 |
|---|---|---|
| Humanity's Last Exam | 46.5% | 5.4% |
| SimpleQA Verified | 70.8% | 31.1% |
| LMArena Expert | 1528 | 1364 |
| GPQA Diamond | — | 66.9% |
| MMLU-Pro | — | 81.1% |
| Vectara Hallucination Rate | — | 5.6% |
| GPQA (HELM) | — | 65.9% |
Multimodal Claude Fable 5.1 leads
Claude Fable 5.1: 54.1 (#4), GPT-4.1: 37.5 (#66)
| Benchmark | Claude Fable 5.1 | GPT-4.1 |
|---|---|---|
| LMArena Vision | 1319 | 1210 |
| GeoBench | — | 72% |
| Blueprint-Bench 2 | 41.9% | — |
| Furniture Assembly | 70% | — |
| LMArena Document | 1513 | — |
Multilingual Claude Fable 5.1 leads
Claude Fable 5.1: 59.5 (#2), GPT-4.1: 49.6 (#128)
| Benchmark | Claude Fable 5.1 | GPT-4.1 |
|---|---|---|
| LMArena Non-English | 1509 | 1370 |
| LMArena Chinese | 1589 | 1382 |
| LMArena French | 1532 | 1383 |
| LMArena German | 1495 | 1380 |
| LMArena Japanese | 1565 | 1320 |
| LMArena Russian | 1525 | 1377 |
| LMArena Spanish | 1503 | 1375 |
| LMArena Korean | — | 1339 |
Instruction Following Claude Fable 5.1 leads
Claude Fable 5.1: 79.3 (#6), GPT-4.1: 71.5 (#148)
| Benchmark | Claude Fable 5.1 | GPT-4.1 |
|---|---|---|
| LMArena Instruction Following | 1515 | 1367 |
| IFEval | — | 83.8% |
Long Context Claude Fable 5.1 leads
Claude Fable 5.1: 46.8 (#19), GPT-4.1: 40.0 (#158)
| Benchmark | Claude Fable 5.1 | GPT-4.1 |
|---|---|---|
| LMArena Longer Query | 1524 | 1385 |
| Fiction.LiveBench | — | 63.9% |
Writing & Preference Claude Fable 5.1 leads
Claude Fable 5.1: 79.3 (#1), GPT-4.1: 57.8 (#120)
| Benchmark | Claude Fable 5.1 | GPT-4.1 |
|---|---|---|
| LMArena Text | 1511 | 1383 |
| LMArena Creative Writing | 1507 | 1363 |
| EQ-Bench Creative Writing | 2162 | 1420 |
| LMArena Multi-Turn | 1492 | 1398 |
| WildBench | — | 85.4% |
Frequently asked questions
Is Claude Fable 5.1 better than GPT-4.1?
Claude Fable 5.1 is the stronger model overall, scoring 68.5 to 35.7 on the Noometry Index. GPT-4.1 costs 5.7× less per token, which makes it the better buy when Claude Fable 5.1's lead doesn't matter for your workload.
Which is cheaper, Claude Fable 5.1 or GPT-4.1?
GPT-4.1 is cheaper. It lists at $2 per million input tokens and $8 per million output tokens; Claude Fable 5.1 lists at $10 and $50.
Is Claude Fable 5.1 or GPT-4.1 better for coding?
Claude Fable 5.1 scores higher on coding benchmarks: 70.5 versus 34.2 in the Noometry coding category.
Which has the bigger context window?
GPT-4.1 does, with 1.05M tokens against 1M.
How many benchmarks do Claude Fable 5.1 and GPT-4.1 share?
30 benchmarks have published results for both models. Claude Fable 5.1 has 50 scored results on Noometry and GPT-4.1 has 52.