Gemini 3.1 Pro (Preview) vs Gemini 3.8 Flash

Gemini 3.1 Pro (Preview) from Google and Gemini 3.8 Flash from Google, side by side. Every figure comes from the model registry. No markup on model usage: you pay the provider's list price.

Side-by-side comparison of Gemini 3.1 Pro (Preview), Gemini 3.8 Flash

Attribute	Gemini 3.1 Pro (Preview)	Gemini 3.8 Flash
Provider	Google	Google
Model id	google/gemini-3.1-pro-preview	google/gemini-3.8-flash
Status	Available via Safeguard	Available via Safeguard
Input / 1M tokens	$2	$0.75
Output / 1M tokens	$12	$3.75
Price notes	Preview model. Prompts <=200K tokens, over 200K: $4 in / $18 out. Output includes thinking tokens. No free tier.	Paid tier. $0.75 in / $3.75 out (output includes thinking tokens) through 2026-12-31, rises to $1.50 / $7.50 from 2027-01-01.
Context	1.05M	1.05M
Parameters	Not published	Not published
Max output	65,536 tokens	65,536 tokens
Modality	Text and image	Text and image
Weights	Closed	Closed
Zero data retention	Not offered	Not offered
Prompts go to	Google (Gemini Developer API)	Google (Gemini Developer API)
Retention	Paid tier: prompts and responses not used to improve Google products, but logged for a limited period for abuse monitoring, free tier content may be used to improve products	Paid tier: prompts and responses not used to improve Google products, but logged for a limited period for abuse monitoring, free tier content may be used to improve products
Region	No region guarantee, data may be stored transiently or cached in any country where Google operates. Google points ZDR and enterprise processing needs to Vertex AI (Gemini Enterprise Agent Platform)	No region guarantee, data may be stored transiently or cached in any country where Google operates. Google points ZDR and enterprise processing needs to Vertex AI (Gemini Enterprise Agent Platform)
Price checked	2026-10-10	2026-10-10

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