How is Gemini 3 Flash Thinking billed?

Input is $0.650 and output is $3.90 per million tokens; cached input is $0.065. The charge for every request is listed in Usage Logs in the console.

How long is the context window?

1.05M tokens. In a long conversation every turn is billed for the full input, so keep the history under control.

Does it support streaming?

Yes. Add "stream": true to the request to receive server-sent events in the OpenAI format.

Google: Gemini 3 Flash Thinking

gemini-3-flash-preview-thinking

Compare API Get an API key Get an API key

Gemini 3 Flash Thinking costs $0.650 per million input tokens and $3.90 per million output tokens, supports 1.05M context, and is available through the OpenAI-compatible API.

Google's Gemini 3 Flash preview model with thinking mode enabled for enhanced reasoning and chain-of-thought capabilities. Audio input costs $1.00 per million audio tokens.

Modalities

Text + Image + Video + Audio → Text

Input / output price

$0.650 / $3.90 per 1M

Context

1.05M · max output 66K

Capabilities

ReasoningVisionLong context

Pricing

Billed per token actually used and deducted from your credits.

Item	USD per 1M tokens
Input	$0.650
Output	$3.90
Cached input	$0.065

Calculator

Drag the sliders to estimate what this model will cost.

Input per request 3K tokensOutput per request 800 tokensRequests per day 500Cached input 0%(higher with long chats or a fixed system prompt)

Per request: $0.00507
Per day: $2.54
Per month (30 days): $76.05

Gemini 3 Flash Thinking: input $0.65/M · output $3.9/M · cached input $0.065/M

Request with these settings

curl https://api.geniusrelaygpt.com/v1/chat/completions \
  -H "Authorization: Bearer $API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "gemini-3-flash-preview-thinking", "max_tokens": 800,
       "messages": [{"role": "user", "content": "…"}]}'

Code samples

OpenAI-compatible. Set the base URL to https://api.geniusrelaygpt.com/v1 and the model to gemini-3-flash-preview-thinking.

curl https://api.geniusrelaygpt.com/v1/chat/completions \
  -H "Authorization: Bearer $API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gemini-3-flash-preview-thinking",
    "stream": true,
    "messages": [{"role": "user", "content": "Hello"}]
  }'

Use it in a client: Cursor · Cline · SillyTavern · Codex

Parameters

Common OpenAI parameters can be passed as-is.

temperaturetop_pmax_tokensstreamstoppresence_penaltyfrequency_penaltyseed

FAQ

How is Gemini 3 Flash Thinking billed?: Input is $0.650 and output is $3.90 per million tokens; cached input is $0.065. The charge for every request is listed in Usage Logs in the console.
How long is the context window?: 1.05M tokens. In a long conversation every turn is billed for the full input, so keep the history under control.
Does it support streaming?: Yes. Add "stream": true to the request to receive server-sent events in the OpenAI format.

Pricing

Calculator

Code samples

Parameters

Related models

FAQ