Gemini 3.8 Flash

Gemini 3.8 Flash is Google's newest Flash text model, generally available since September 2, 2026, and described by Google as its most intelligent Flash model. It is aimed at long-horizon software engineering, autonomous agents and enterprise workflows, and accepts text, images, video, audio and PDFs.

By GoogleReleased September 2, 2026Data checked October 10, 2026

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Specifications

Context window: 1Mabout 786,000 words, or 1,570 pages
Max output: 64Ktokens per response
Input price: $0.75per 1M tokens
Output price: $3.75per 1M tokens
Cached input: $0.075per 1M tokens
Weights: ClosedProprietary
Parameters: Undisclosed
Input types: Text, Images, Video, Audio, PDF
Output types: Text
Reasoning mode: Yes
Tool calling: Yes
Released: Sep 2, 2026Current

Introductory paid-tier rates through 2026-12-31; from 2027-01-01 the rates are $1.50 input, $7.50 output and $0.15 caching. Free tier available. Batch and Flex 50% off; Priority costs more. Cache storage $0.50 per 1M tokens per hour.

What it costs in practice

Workload	Monthly cost at list price
Support chatbot30,000 conversations a month, 2,000 input and 400 output tokens each	$90
Document summaries2,000 documents a month, 12,000 input and 800 output tokens each	$24
Coding agent1,000 tasks a month, 60,000 input and 6,000 output tokens each	$68

Standard rates, no caching or batch discounts. Run your own numbers.

Strengths

1,048,576-token input limit and 65,536-token output limit
Thinking levels of low, medium and high
Google Search and Maps grounding, code execution and file search

Trade-offs to weigh

Introductory pricing ends December 31, 2026, after which rates double
The minimal thinking level is not supported

Where it fits

Google positions Gemini 3.8 Flash for:

codingagentsmultimodallong documentshigh volume

Where you can use it

API
Google Vertex AI
OpenRouter

Alternatives to consider

Model	Tier	Context	Input / output per 1M
Muse Spark 1.3Meta	Advanced	1M	$1.25 / $4.25	Compare
Gemini 3.6 FlashGoogle	Advanced	1M	$0.75 / $3.75	Compare
NVIDIA Nemotron 3 UltraNVIDIA	Advanced	1M	$0.50 / $2.20	Compare
Claude Sonnet 5.5Anthropic	Advanced	1M	$2 / $10	Compare

Frequently asked questions

How much does Gemini 3.8 Flash cost?

Gemini 3.8 Flash lists at $0.75 per million input tokens and $3.75 per million output tokens, with cached input at $0.075 (checked October 10, 2026). Introductory paid-tier rates through 2026-12-31; from 2027-01-01 the rates are $1.50 input, $7.50 output and $0.15 caching. Free tier available. Batch and Flex 50% off; Priority costs more. Cache storage $0.50 per 1M tokens per hour. Confirm current rates on the provider's pricing page before you commit.

What is the context window of Gemini 3.8 Flash?

Gemini 3.8 Flash accepts up to 1,048,576 tokens of context (about 786,000 words, or 1,570 pages), and it can write up to 64K tokens in a single response. Long prompts cost more and can be slower, so most apps send only what the task needs.

Is Gemini 3.8 Flash open source?

No. Gemini 3.8 Flash is a proprietary model from Google; its weights aren't published. You can use it through the Google API and through Google Vertex AI, OpenRouter.

What is Gemini 3.8 Flash best for?

Google positions Gemini 3.8 Flash for coding, agents, multimodal, long documents. It accepts text, images, video, audio, pdf as input, has a reasoning (thinking) mode and supports tool calling. Test it on a sample of your own tasks before you choose it for production.

Sources

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