Gemini 3.1 Pro
Google · released 19 Feb 2026 · proprietary API
Frontier long-context multimodal reasoning; largest practical context in class.
Context window
1M
1,000,000 tokens
Input price
$2
per 1M tokens
Output price
$12
per 1M tokens
Blended
$4.50
3:1 in:out mix
Weights
Proprietary
API only
Released
19 Feb 2026
Long-context / tier pricing — >200K billed $4/$18 (long-context tier). Listed prices are the base rate for prompts up to ~200K tokens.
Where it ranks
Of the 16 models tracked, Gemini 3.1 Pro is #12 cheapest to run (blended $/1M at a 3:1 input:output mix), #10 (tied) by input price, and #2 (tied) by context window.
See the full Frontier Index →Compare with
The nearest models by blended cost to run.
Put it to work
Specs from BitByteCore's hand-verified Frontier Ledger (v2026-07-04, verified 21 Jun 2026). Model pricing moves fast — confirm with Google before you rely on a figure.