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Google: Gemini 2.5 Flash

gemini-2.5-flash

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Gemini 2.5 Flash costs $0.390 per million input tokens and $3.25 per million output tokens, supports 1.05M context, and is available through the OpenAI-compatible API.

Fast, cost efficient performance on complex tasks. The workhorse of the Gemini series. Stable release with improved capabilities. Audio input costs $1.00 per million audio tokens.

Modalities

Text + Image + Video + Audio → Text

Input / output price

$0.390 / $3.25 per 1M

Context

1.05M · max output 66K

Capabilities

ReasoningVisionTool callingLong context

Pricing

Billed per token actually used and deducted from your credits.

ItemUSD per 1M tokens
Input$0.390
Output$3.25
Cached input$0.039

Calculator

Drag the sliders to estimate what this model will cost.

Per request
$0.00377
Per day
$1.89
Per month (30 days)
$56.55

Gemini 2.5 Flash: input $0.39/M · output $3.25/M · cached input $0.039/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-2.5-flash", "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-2.5-flash.

curl https://api.geniusrelaygpt.com/v1/chat/completions \
  -H "Authorization: Bearer $API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gemini-2.5-flash",
    "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 2.5 Flash billed?
Input is $0.390 and output is $3.25 per million tokens; cached input is $0.039. 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.
Gemini 2.5 Flash API pricing · GeniusRelay