Comparing 2 models
Claude Opus 5.5 vs Gemini 3.1 Pro Preview
Benchmarks through
Verdict
Gemini 3.1 Pro Preview places higher on 2 of the 2 tasks where both are ranked. Gemini 3.1 Pro Preview costs 2.0x less per input token. Gemini 3.1 Pro Preview accepts 1.0x more context.
- Choose Gemini 3.1 Pro Preview for Chat & Roleplay (#3), Roleplay & Character (#3).
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 3.1 Pro Preview | Source |
|---|---|---|---|
| Design Arena Coding | 1392 Elo | 1233 Elo | source · 2026-10-16 |
| Design Arena UI | 1378 Elo | 1226 Elo | source · 2026-10-16 |
| Design Arena Website | 1338 Elo | 1235 Elo | source · 2026-10-16 |
| FACTS Grounding | 68.5% | 65.7% | source · 2026-09-24 |
| FrontierMath Tiers 1-3 (Epoch AI) | 91.2% ± 1.7 | 59.6% ± 2.9 | source · 2026-09-22 |
| GPQA Diamond (Epoch AI) | 90.6% ± 1.9 | 94.1% ± 1.7 | source · 2026-09-22 |
| LiveBench Agentic Coding | 71.7% | 44.1% | source · 2026-10-16 |
| LiveBench Coding | 89.3% | 76.5% | source · 2026-10-16 |
| LiveBench Data Analysis | 80.3% | 78.5% | source · 2026-10-16 |
| LiveBench Instruction Following | 65.7% | 79.1% | source · 2026-10-16 |
| LiveBench Language | 86.3% | 85.4% | source · 2026-10-16 |
| LiveBench Math | 97.1% | 91.0% | source · 2026-10-16 |
| LiveBench Reasoning | 92.2% | 84% | source · 2026-10-16 |
| LMArena Agent | 17.2 | -3.5 | source · 2026-10-14 |
| LMArena Agent Bash Recovery | 13.6 | -23.3 | source · 2026-10-08 |
| LMArena Agent Steerability | 17.9 | -6.2 | source · 2026-10-14 |
| LMArena Agent Task Outcome | 19.4 | -10.1 | source · 2026-10-14 |
| LMArena Agent Tool Hallucination | 0.5 | -0.2 | source · 2026-10-14 |
| LMArena Creative Writing | 1534 Elo | 1482 Elo | source · 2026-10-15 |
| LMArena Instruction Following | 1536 Elo | 1466 Elo | source · 2026-10-15 |
| LMArena Long Query | 1531 Elo | 1483 Elo | source · 2026-10-15 |
| LMArena Math | 1508 Elo | 1485 Elo | source · 2026-10-15 |
| LMArena Text | 1508 Elo | 1487 Elo | source · 2026-10-15 |
| LMArena Text Factuality | 1509 Elo | 1472 Elo | source · 2026-10-15 |
| LMArena Vision | 1293 Elo | 1280 Elo | source · 2026-10-09 |
| LMArena Vision Diagrams | 1324 Elo | 1309 Elo | source · 2026-10-09 |
| LMArena Vision OCR | 1307 Elo | 1294 Elo | source · 2026-10-09 |
| LMArena WebDev | 1811 Elo | 1447 Elo | source · 2026-10-13 |
| LMArena WebDev Image-to-Web | 1749 Elo | 1481 Elo | source · 2026-10-09 |
| OTIS Mock AIME (Epoch AI) | 100% ± 0 | 95.6% ± 3.1 | source · 2026-09-22 |
| SimpleQA Verified (Epoch AI) | 72.2% ± 1.4 | 73.5% ± 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.