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Gemini 3.8 Flash pricing and routing profile

Gemini 3.8 Flash from Google lists at $0.75 per million input tokens and $3.75 per million output tokens, with a 1,048,576-token context window. Prices from OpenRouter's catalogue on 2026-09-28.

Input, per 1M tokens$0.75

Output, per 1M tokens$3.75

Cached input, per 1M$0.075

Context window1.05M

Confidence signalNot exposed

Tool callingStructured outputReasoning control

Cost per 1,000 requests

Request shape	List cost
Classification or routing (600 tokens in, 10 out)	$0.487
Chat reply (2,000 in, 400 out)	$3.00
Retrieval-augmented answer (8,000 in, 500 out)	$7.88

Before prompt caching. Try your own shape in the cost calculator.

Can Gimbix route to it first?

Not as a first-answer model through OpenRouter: no host returns token log probabilities for Gemini 3.8 Flash. It can still be the model Gimbix falls back to when a cheaper model is unsure.

Measured by Gimbix

On 400 real BANKING77 customer messages, Gemini 3.8 Flash answered 331 correctly (95% interval 78.7%–86.1%), with 0 invalid answers, at $1.04 per 1,000 requests and a median of 2,774 ms. See all 22 models.

Who serves Gemini 3.8 Flash

Host	Input / output per 1M	Log probabilities	Uptime, last 30 min
Google AI Studio	$0.375 / $1.88	no	100.0%
Google	$0.375 / $1.88	no	99.6%
Google AI Studio	$0.75 / $3.75	no	99.8%
Google	$0.75 / $3.75	no	98.8%
Google AI Studio	$1.35 / $6.75	no	99.9%
Google	$1.35 / $6.75	no	98.4%

A host that lists log probabilities may still omit them; Gimbix checks each one before relying on it.

Cheaper models that can answer first

Models priced below Gemini 3.8 Flash that expose a confidence signal. Whether they answer your traffic as well is what a Gimbix pilot measures.

Model	Input / output per 1M	Cheaper on a chat reply
Kimi K2.6	$0.65 / $3.41	11%
Kimi K2.7 Code	$0.656 / $3.30	12%
Qwen3 Coder Plus	$0.65 / $3.25	13%
Qwen3.5 397B A17B	$0.55 / $3.50	17%
Kimi K2 Thinking	$0.60 / $2.50	27%
GPT Audio Mini	$0.60 / $2.40	28%

Compare Gemini 3.8 Flash

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 on OpenRouter as of 2026-09-28. A typical chat reply of 2,000 input and 400 output tokens costs about $3.00 per 1,000 requests.

What is the context window of Gemini 3.8 Flash?

1,048,576 tokens.

Can a cheaper model replace Gemini 3.8 Flash?

Sometimes. Gimbix proves it on your own traffic before routing: the cheaper model must match Gemini 3.8 Flash on one half of your requests and make at most three answers worse on the other.