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Gemini 3.8 Flash vs Gemini 3.1 Pro

Of the 5 public leaderboards that rate both, Gemini 3.8 Flash scores higher on 4 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 3.8 Flash is at 50 and Gemini 3.1 Pro at 16.7 (out of 100).

Scores as published by each board; table composed September 25, 2026.

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Leaderboard by leaderboard

BoardGemini 3.8 FlashGemini 3.1 ProHigher
LMArena
Elo (community votes)
1,583.81,486.8Gemini 3.8 Flash
LiveBench
global average (0-100)
75.877Gemini 3.1 Pro
SimpleBench
AVG@5 % (private set)
82.479.6Gemini 3.8 Flash
Vals AI
Vals Index accuracy % · weighted finance + coding tasks
62.341.9Gemini 3.8 Flash
Artificial Analysis
intelligence index · measured runs only
40.929.7Gemini 3.8 Flash

Raw scores are each board's own scale, so compare within a row, not across rows. Full table: the bench index.

Gemini 3.8 Flash at a glance

Developer
Google
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."

Full Gemini 3.8 Flash tracker →

Gemini 3.1 Pro at a glance

Developer
Google
Status
Live

Live.

Full Gemini 3.1 Pro tracker →

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. Of the 5 public leaderboards that rate both, Gemini 3.8 Flash scores higher on 4 and Gemini 3.1 Pro on 1. Gemini 3.8 Flash's widest lead is on Vals AI; Gemini 3.1 Pro's widest lead is on LiveBench. 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 50 and Gemini 3.1 Pro at 16.7 (out of 100).

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 September 25, 2026). Boards measure different things, so raw scores are only comparable within a row.

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