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Gemini 3.8 Flash
Google’s fast, low-cost Gemini workhorse, upgraded for long-horizon coding and agent tasks.
Product insights
Gemini 3.8 Flash at a glance
Value proposition
Near-frontier reasoning and agentic coding at Flash speed and price, with adjustable thinking effort to trade quality against token cost.
Problem solved
Long-running agents and coding tasks get expensive on large models, while cheap models often give up early on hard, multi-step problems.
Audience
Developers building agents and coding tools, enterprises on Gemini Enterprise, and Google AI Pro or Ultra subscribers using the Gemini app.
Pricing and access
Gemini API introductory price of $0.75 per million input tokens and $3.75 per million output tokens until December 31, 2026, then $1.50 and $7.50 from January 1, 2027. In the Gemini app it is included with Google AI Pro and Ultra.
Market
- Released by Google on September 2, 2026
- Successor to Gemini 3.7 Flash
- Launched alongside Gemini 3.8 Flash Cyber for vetted security teams
Tech stack
- API model ID: gemini-3.8-flash
- 1,048,576-token input, 65,536-token output
- Input: text, image, video, audio, PDF; output: text
- Thinking levels low, medium, high
01Why it is here
What is Gemini 3.8 Flash?
Gemini 3.8 Flash is a large language model in Google’s Gemini family, sitting in the Flash tier that balances intelligence, speed, and cost. Compared with 3.7 Flash, Google says it works more diligently on hard problems, taking extra reasoning steps and tool calls to finish long software engineering tasks end to end, and it scores 54.9% on HLE-Verified. It supports function calling, code execution, Search and Maps grounding, structured outputs, caching, file search, URL context, and computer use in preview. Google also released Gemini 3.8 Flash Cyber, a security-tuned variant for vulnerability detection and patching that is only available to trusted defenders through its Fairwind Program.
02Workflow
How to use Gemini 3.8 Flash
- 01
Try it in the Gemini app
With Google AI Pro or Ultra, pick Gemini 3.8 Flash in the Gemini app, or use AI Mode in Google Search.
- 02
Get an API key in Google AI Studio
Open Google AI Studio, test prompts with gemini-3.8-flash, and create an API key for the Gemini API.
- 03
Set thinking effort and tools
Choose a low, medium, or high thinking level and enable tools like function calling, code execution, or Search grounding for agent workflows.
03Capabilities
Key features of Gemini 3.8 Flash
- 1M-token multimodal context
- Long-horizon agentic coding
- Adjustable thinking levels
- Function calling and code execution
- Search and Maps grounding
04Use cases
What is Gemini 3.8 Flash best for?
- Coding agents and IDE assistants
- High-volume apps that need low cost
- Finance and legal agent workflows
05Questions
FAQ about Gemini 3.8 Flash
When was Gemini 3.8 Flash released?
Google released Gemini 3.8 Flash on September 2, 2026.
How much does Gemini 3.8 Flash cost?
In the Gemini API it costs $0.75 per million input tokens and $3.75 per million output tokens through December 31, 2026, rising to $1.50 and $7.50 from January 1, 2027.
What is the Gemini 3.8 Flash context window?
It accepts up to 1,048,576 input tokens and returns up to 65,536 output tokens.
What is Gemini 3.8 Flash Cyber?
A cybersecurity-tuned version of 3.8 Flash for vulnerability detection and automated patching, available only to trusted defenders through Google’s Fairwind Program.
Official website snapshot
ai.google.dev
Gemini 3.8 Flash is the Flash-tier Gemini model Google released on September 2, 2026, as the successor to Gemini 3.7 Flash. Google calls it its most intelligent workhorse model: it keeps Flash speed and pricing while improving software engineering, agentic work, and multi-step reasoning in fields like finance and law. It takes text, images, video, audio, and PDFs with a 1M-token context window, and is available in the Gemini app, AI Mode in Search, Google AI Studio, and the Gemini API as gemini-3.8-flash.
