Head-to-head
Claude Opus 5.5 vs Gemini 3.5 Flash
As of October 25, 2026, Claude Opus 5.5 leads Gemini 3.5 Flash on the Analyzer Index, 98.4 to 82.6.
Normalized scores are min-maxed per benchmark across all models we track (0–100). Open the interactive compare view to add benchmarks to the radar chart or pull in more models.
Claude Opus 5.5
AnthropicGemini 3.5 Flash
Google| At a glance | Claude Opus 5.5 | Gemini 3.5 Flash |
|---|---|---|
| Analyzer Index | 98.4 (5/13) | 82.6 (6/13) |
| Blended price | $8.00/M | $1.69/M |
| Cheapest host | maker's API | maker's API |
| Context | 1.0M | 1.0M |
| Output speed | 245 tok/s | 369 tok/s |
| Time to first token | 4.00 s | 13.68 s |
| Benchmark | Claude Opus 5.5 | Gemini 3.5 Flash |
|---|---|---|
Chatbot Arena Elo Arena | ||
Output Speed Speed | ||
Time to First Token TTFT | ||
FrontierMath Tiers 1-3 FrontierMath | — | |
SimpleQA Verified SimpleQA | ||
OTIS Mock AIME 2024-2025 OTIS AIME | ||
ARC-AGI 2 ARC-AGI 2 | ||
Frontier Composite Frontier | ||
Output Stability Stability | — | |
Format Adherence Format | — | |
Recovery Rate Recovery | — | |
API Success Rate API OK | — | |
Safety Handling Safety | — |
Methodology matches the main AI Model Analyzer About page.