Comparing 2 models
Claude Fable 5.1 vs Gemini 4 Argon
Benchmarks through
Verdict
Claude Fable 5.1 places higher on 7 of the 12 tasks where both are ranked. Gemini 4 Argon costs 5.0x less per input token. Gemini 4 Argon accepts 1.0x more context.
- Choose Claude Fable 5.1 for Massive Context (#1), Competition Math (#1), Tool & Function Calling (#1).
- Choose Gemini 4 Argon for Logic & Problem Solving (#1), Grounded RAG (#1), Document Summarization (#1).
Built from the published task rankings below; ranks come from each task's own weighted benchmarks, so a win on one task says nothing about another.
Measured head to head
Benchmarks both models were run on
| Evaluation | Claude Fable 5.1 | Gemini 4 Argon | Source |
|---|---|---|---|
| Design Arena Coding | 1338 Elo | 1335 Elo | source · 2026-10-16 |
| Design Arena UI | 1338 Elo | 1319 Elo | source · 2026-10-16 |
| Design Arena Website | 1314 Elo | 1321 Elo | source · 2026-10-16 |
| FrontierMath Tiers 1-3 (Epoch AI) | 90.2% ± 1.8 | 86% ± 2.1 | source · 2026-09-01 |
| LMArena Agent | 14.1 | 13.7 | source · 2026-10-14 |
| LMArena Agent Bash Recovery | 11.6 | -21.4 | source · 2026-10-08 |
| LMArena Agent Steerability | 14.7 | 16.8 | source · 2026-10-14 |
| LMArena Agent Task Outcome | 15.7 | 14.6 | source · 2026-10-14 |
| LMArena Agent Tool Hallucination | 0.6 | 0 | source · 2026-10-14 |
| LMArena Creative Writing | 1508 Elo | 1527 Elo | source · 2026-10-15 |
| LMArena Instruction Following | 1517 Elo | 1536 Elo | source · 2026-10-15 |
| LMArena Long Query | 1523 Elo | 1546 Elo | source · 2026-10-15 |
| LMArena Math | 1528 Elo | 1536 Elo | source · 2026-10-15 |
| LMArena Text | 1502 Elo | 1524 Elo | source · 2026-10-15 |
| LMArena Text Factuality | 1498 Elo | 1511 Elo | source · 2026-10-15 |
| LMArena WebDev | 1743 Elo | 1678 Elo | source · 2026-10-13 |
| OTIS Mock AIME (Epoch AI) | 100% ± 0 | 100% ± 0 | source · 2026-09-01 |
| SimpleQA Verified (Epoch AI) | 70.8% ± 1.4 | 76% ± 1.4 | source · 2026-09-01 |
Values are as published by each evaluator, in its own units; rows from different evaluators are not on a common scale.
task evidence
How they place when the question changes
Lower ranks are better. “Best” marks the strongest option in this shortlist for that task.