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Gemini 3.5 Flash vs Gemini 3.1 Pro
Of the 2 public leaderboards that rate both, Gemini 3.5 Flash scores higher on 1 and Gemini 3.1 Pro on 1. On the ArtificialWatch Index, which takes the median of each model's percentile across the boards that score it, Gemini 3.5 Flash is at 37.7 and Gemini 3.1 Pro at 39.4 (out of 100).
Scores as published by each board; table composed November 8, 2026.
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Leaderboard by leaderboard
| Board | Gemini 3.5 Flash | Gemini 3.1 Pro | Higher |
|---|---|---|---|
| LMArena Elo (community votes) | 1,499.1 | 1,480 | Gemini 3.5 Flash |
| SimpleBench AVG@5 % (private set) | 76.7 | 79.6 | Gemini 3.1 Pro |
Raw scores are each board's own scale, so compare within a row, not across rows. Full table: the bench index.
For coding
On the ArtificialWatch coding index, Gemini 3.5 Flash is at 32.3 (#34 of 45) and Gemini 3.1 Pro at 18.2 (#41). Gemini 3.5 Flash scores higher on both coding boards that rate them.
| Coding board | Gemini 3.5 Flash | Gemini 3.1 Pro |
|---|---|---|
| LMArena · Coding | 1,492.6 | 1,482.7 |
| Vals Vibe Code Bench | 48.7 | 32 |
Gemini 3.5 Flash at a glance
- Developer
- Status
- Live since May 19, 2026
- API price
- $1.50 input / $9 output per 1M tokens · Google, gemini-3.5-flash
- Context window
- 1.05M tokens
Live — preview since I/O, on OpenRouter · deprecated by Google Oct 8: no longer selectable in AI Studio, API requests to gemini-3.5-flash auto-route to gemini-3.6-flash, and the endpoint is not shutting down (Gemini API changelog + deprecations page, read Oct 26).
Gemini 3.1 Pro at a glance
- Developer
- Status
- Live
Live.
Gemini 3.5 Flash vs Gemini 3.1 Pro: quick answers
Which is better, Gemini 3.5 Flash or Gemini 3.1 Pro?
It depends on what you measure. Of the 2 public leaderboards that rate both, Gemini 3.5 Flash scores higher on 1 and Gemini 3.1 Pro on 1. Gemini 3.5 Flash's widest lead is on LMArena; Gemini 3.1 Pro's widest lead is on SimpleBench. On the ArtificialWatch Index, which takes the median of each model's percentile across the boards that score it, Gemini 3.5 Flash is at 37.7 and Gemini 3.1 Pro at 39.4 (out of 100).
How do Gemini 3.5 Flash and Gemini 3.1 Pro compare for coding?
On the ArtificialWatch coding index, Gemini 3.5 Flash is at 32.3 (#34 of 45) and Gemini 3.1 Pro at 18.2 (#41). Gemini 3.5 Flash scores higher on both coding boards that rate them.
Who makes Gemini 3.5 Flash and Gemini 3.1 Pro?
Both are from Google.
Where do these numbers come from?
Each score is the leaderboard's own published figure, read by ArtificialWatch (table composed November 8, 2026). Boards measure different things, so raw scores are only comparable within a row.
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Also: the bench index · API pricing · the wire