Comparing 2 models
Claude Opus 5.5 vs Gemini 4 Argon
Benchmarks through
Verdict
Claude Opus 5.5 and Gemini 4 Argon split the 10 tasks where both are ranked, 5 each. Gemini 4 Argon costs 2.0x less per input token. Gemini 4 Argon accepts 1.0x more context.
- Choose Claude Opus 5.5 for Coding (#1), Frontend & UI (#1), Computer & Browser Use (#1).
- Choose Gemini 4 Argon for Logic & Problem Solving (#1), RAG & Long Context (#1), a General Assistant (#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 Opus 5.5 | Gemini 4 Argon | Source |
|---|---|---|---|
| Design Arena Coding | 1392 Elo | 1335 Elo | source · 2026-10-16 |
| Design Arena UI | 1378 Elo | 1319 Elo | source · 2026-10-16 |
| Design Arena Website | 1338 Elo | 1321 Elo | source · 2026-10-16 |
| FACTS Grounding | 68.5% | 78.6% | source · 2026-09-24 |
| FrontierMath Tiers 1-3 (Epoch AI) | 91.2% ± 1.7 | 86% ± 2.1 | source · 2026-09-22 |
| GPQA Diamond (Epoch AI) | 90.6% ± 1.9 | 96.4% ± 1.2 | source · 2026-09-22 |
| LMArena Agent | 17.2 | 13.7 | source · 2026-10-14 |
| LMArena Agent Bash Recovery | 13.6 | -21.4 | source · 2026-10-08 |
| LMArena Agent Steerability | 17.9 | 16.8 | source · 2026-10-14 |
| LMArena Agent Task Outcome | 19.4 | 14.6 | source · 2026-10-14 |
| LMArena Agent Tool Hallucination | 0.5 | 0 | source · 2026-10-14 |
| LMArena Creative Writing | 1534 Elo | 1527 Elo | source · 2026-10-15 |
| LMArena Instruction Following | 1536 Elo | 1536 Elo | source · 2026-10-15 |
| LMArena Long Query | 1531 Elo | 1546 Elo | source · 2026-10-15 |
| LMArena Math | 1508 Elo | 1536 Elo | source · 2026-10-15 |
| LMArena Text | 1508 Elo | 1524 Elo | source · 2026-10-15 |
| LMArena Text Factuality | 1509 Elo | 1511 Elo | source · 2026-10-15 |
| LMArena WebDev | 1811 Elo | 1678 Elo | source · 2026-10-13 |
| OTIS Mock AIME (Epoch AI) | 100% ± 0 | 100% ± 0 | source · 2026-09-22 |
| SimpleQA Verified (Epoch AI) | 72.2% ± 1.4 | 76% ± 1.4 | source · 2026-09-22 |
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.