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Gemini 3.8 Flash vs Gemini 3.1 Pro
Gemini 3.8 Flash scores higher than Gemini 3.1 Pro on all 3 public leaderboards that rate both. On the ArtificialWatch Index, which takes the median of each model's percentile across the boards that score it, Gemini 3.8 Flash is at 43.7 and Gemini 3.1 Pro at 38.1 (out of 100).
Scores as published by each board; table composed November 10, 2026.
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Leaderboard by leaderboard
| Board | Gemini 3.8 Flash | Gemini 3.1 Pro | Higher |
|---|---|---|---|
| LMArena Elo (community votes) | 1,583.8 | 1,480 | Gemini 3.8 Flash |
| SimpleBench AVG@5 % (private set) | 82.4 | 79.6 | Gemini 3.8 Flash |
| Epoch AI Epoch Capabilities Index (ECI) · many benchmarks on one scale | 158.7 | 156.3 | Gemini 3.8 Flash |
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 3.8 Flash is at 40.8 (#26 of 47) and Gemini 3.1 Pro at 20.9 (#43). Gemini 3.8 Flash scores higher on both coding boards that rate them.
| Coding board | Gemini 3.8 Flash | Gemini 3.1 Pro |
|---|---|---|
| LMArena · Coding | 1,510.6 | 1,482.4 |
| Vals Vibe Code Bench | 78.7 | 32 |
Gemini 3.8 Flash at a glance
- Developer
- Status
- Live since September 2, 2026
- API price
- $0.75 input / $3.75 output per 1M tokens · Google, gemini-3.8-flash
- Context window
- 1.05M tokens
Live — GA Sep 2 · $0.75/$3.75 per 1M introductory through Dec 31, identical to 3.7 · 1M in / 64K out · 'our most intelligent Flash model' · 20 days after 3.7.
Gemini 3.8 Flash is GA — same price as 3.7, twenty days later
2026-09-02 · Google released Gemini 3.8 Flash today. The Gemini API changelog for September 2 reads: "Gemini 3.8 Flash generally available (GA): Released gemini-3.8-flash, our most intelligent Flash model, engineered for long-horizon software engineering, autonomous agents, and complex enterprise workflows."
Gemini 3.1 Pro at a glance
- Developer
- Status
- Live
Live.
Gemini 3.8 Flash vs Gemini 3.1 Pro: quick answers
Which is better, Gemini 3.8 Flash or Gemini 3.1 Pro?
It depends on what you measure. Gemini 3.8 Flash scores higher than Gemini 3.1 Pro on all 3 public leaderboards that rate both. Gemini 3.8 Flash's widest lead is on LMArena. On the ArtificialWatch Index, which takes the median of each model's percentile across the boards that score it, Gemini 3.8 Flash is at 43.7 and Gemini 3.1 Pro at 38.1 (out of 100).
How do Gemini 3.8 Flash and Gemini 3.1 Pro compare for coding?
On the ArtificialWatch coding index, Gemini 3.8 Flash is at 40.8 (#26 of 47) and Gemini 3.1 Pro at 20.9 (#43). Gemini 3.8 Flash scores higher on both coding boards that rate them.
Who makes Gemini 3.8 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 10, 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