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Gemini 3.8 Flash & Gemini 3.8 Flash Cyber

Google's two Gemini 3.8 models released on 2 September 2026: 3.8 Flash for long-horizon coding and autonomous agents, and 3.8 Flash Cyber for frontier cybersecurity work by trusted defenders

Model Overview

Specs, access and pricing details below

Features

  • ✓ Two variants from one core: Gemini 3.8 Flash for long-horizon software engineering and autonomous agents, and Gemini 3.8 Flash Cyber for vulnerability detection and automated patching, both powered by the same foundational intelligence
  • ✓ Substantial gains over 3.7 Flash from three weeks earlier across software engineering, agentic tasks and multi-step reasoning in specialised domains, often approaching higher-cost frontier models
  • ✓ Leads on DeepSWE v1.1 long-horizon software engineering, Vals Finance Agent V2 and Harvey's Legal Agent Benchmark, and reaches 54.9% on HLE-Verified
  • ✓ Same price as 3.7 Flash: introductory $0.75 per million input tokens and $3.75 per million output tokens, rising to $1.50 / $7.50 from 1 January 2027
  • ✓ Driven by long-running agentic loops that recursively evaluate and refine the model; 3.7 Flash remains supported for efficiency-first workloads

How to Use

  1. Open the model picker in Google AI Studio or the Gemini Enterprise Agent Platform
  2. Select Gemini 3.8 Flash (model ID: gemini-3.8-flash); for cybersecurity tasks apply to the Fairwind program for 3.8 Flash Cyber
  3. Enter your long-horizon coding or agent prompt and adjust the thinking level if needed (medium by default)
  4. Compare quality and token usage against 3.7 Flash before moving to production

FAQ

What is Gemini 3.8 Flash?

Google's Gemini 3.8 family released on 2 September 2026 in two variants: Gemini 3.8 Flash, a highly intelligent workhorse for long-horizon coding and autonomous agents, and Gemini 3.8 Flash Cyber, a frontier cybersecurity model for trusted defenders, both powered by the same foundational intelligence.

How does 3.8 Flash improve on 3.7 Flash?

Google says 3.8 Flash delivers significant gains over 3.7 Flash across software engineering, agentic tasks and multi-step reasoning in specialised domains, often approaching higher-cost frontier models, with leading results on DeepSWE v1.1, Vals Finance Agent V2 and Harvey's Legal Agent Benchmark and 54.9% on HLE-Verified.

What are Gemini 3.8 Flash Cyber and the Fairwind program?

3.8 Flash Cyber focuses on frontier-level vulnerability detection and automated patching and is Google's most capable cybersecurity model, available only to trusted defenders through the new Fairwind program rather than to general users.

How much does Gemini 3.8 Flash cost?

The same as 3.7 Flash: an introductory price of $0.75 per million input tokens and $3.75 per million output tokens, adjusting to $1.50 input and $7.50 output per million tokens from 1 January 2027.

How do I call Gemini 3.8 Flash?

Select it in Google AI Studio or the Gemini Enterprise Agent Platform, or use the API model ID gemini-3.8-flash with a medium default thinking level; 3.7 Flash remains supported for cost-first workloads.

Will 3.8 Flash use more tokens?

Google notes that on complex tasks 3.8 Flash works harder, executing extra reasoning steps and calling tools iteratively, which can consume more tokens for performance. If compute efficiency is your primary constraint, use lower effort levels or stay on 3.7 Flash.