Gemini 3.1 Pro (Preview) — pricing and what it's actually good for

Google's Gemini 3.1 Pro, in PREVIEW rather than generally available. Advanced intelligence and agentic capability. Priced in two tiers by prompt size. Preview models can change or be withdrawn. Context window and max output tokens are not published on Google's pricing or models overview pages and are recorded as unknown rather than taken from a third party. Pricing captured from Google's own pricing page, 2026-08-07 11:51 UTC.

Released: 19 Feb 2026
API identifier: gemini-3.1-pro-preview

Pricing · per 1M tokens

Input$2.00

Output$12.00

Checked against Google Gemini API pricing on 7 Aug 2026, 11:51 UTC

Google tiers by PROMPT SIZE: prompts over 200k tokens are billed at the higher rate on both input and output. Anthropic bills its full 1M window at a flat rate, so long-context comparisons between the two are not like-for-like.

Best for

Reasoning & Research Code Generation

Sources: Google Gemini API pricing · Google Gemini models overview

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