Head-to-head
Gemini 3.5 Flash vs Gemini 3.1 Pro
As of October 25, 2026, Gemini 3.1 Pro leads Gemini 3.5 Flash on the Analyzer Index, 87.0 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.
Gemini 3.5 Flash
GoogleGemini 3.1 Pro
Google| At a glance | Gemini 3.5 Flash | Gemini 3.1 Pro |
|---|---|---|
| Analyzer Index | 82.6 (6/13) | 87.0 (9/13) |
| Blended price | $1.69/M | $2.25/M |
| Cheapest host | maker's API | maker's API |
| Context | 1.0M | 2.0M |
| Output speed | 369 tok/s | 188 tok/s |
| Time to first token | 13.68 s | 87.47 s |
| Benchmark | Gemini 3.5 Flash | Gemini 3.1 Pro |
|---|---|---|
Chatbot Arena Elo Arena | ||
SWE-bench Verified SWE-bench | — | |
MMMU-Pro MMMU-Pro | — | |
Output Speed Speed | ||
Time to First Token TTFT | ||
FrontierMath Tiers 1-3 FrontierMath | ||
SimpleQA Verified SimpleQA | ||
OTIS Mock AIME 2024-2025 OTIS AIME | ||
Humanity's Last Exam HLE | — | |
ARC-AGI 2 ARC-AGI 2 | ||
Terminal-Bench 2 TermBench 2 | — | |
Frontier Composite Frontier | ||
API Success Rate API OK | — |
Methodology matches the main AI Model Analyzer About page.