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Gemini 3.1 Pro Preview vs Gemini 3.5 Flash

List rates and scores as of 2026-09-20. Lower $/MTok is cheaper. Higher scores rank better. Input edge: Gemini 3.5 Flash Output edge: Gemini 3.5 Flash

Model A

Gemini 3.1 Pro Preview

Google

gemini/gemini-3.1-pro-preview

reasoningtools

List input$1
List output$6
Context1.0M
Offers33
Arena codeN/A
Arena text1487
Arena visionN/A
AA intelligence29.7
AA coding68.8
AA agentic8.2

On plans: Copilot Business, Copilot Enterprise, Copilot Pro, Copilot Pro+

Model B

Gemini 3.5 Flash

Google

gemini/gemini-3.5-flash

reasoningtools

List input$0.1857
List output$1.11
Context1.0M
Offers44
Arena code1500
Arena textN/A
Arena vision1284
AA intelligence32.6
AA coding70.1
AA agentic26

On plans: Cursor Business, Cursor Pro, Cursor Ultra, Gemini Code Assist Enterprise

Score sources on /benchmarks.