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OpenKey

Gemini 2.5 Flash

GoogleReleased Jun 17, 2025

Gemini 2.5 Flash is Google's state-of-the-art workhorse model, specifically designed for advanced reasoning, coding, mathematics, and scientific tasks. It includes built-in "thinking" capabilities, enabling it to provide responses with greater...

Try in playground
Context window
1.0M tokens
Max output
66K tokens
Input
file, image, text, audio, video
Output
text
Tokenizer
Gemini
Knowledge cutoff
Jan 31, 2025
Released
Jun 17, 2025
Reasoning
optional

Pricing

Per 1M tokens. The provider price and our flat 3% fee are separate columns — what you pay is their sum.

Per 1M tokensProvider+ 3% feeYou pay
Input$0.300$0.0090$0.309
Output$2.50$0.075$2.58
Cache read$0.030$0.0009$0.031
Cache write$0.083$0.0025$0.086

Benchmarks

Design Arena

CategoryEloWin rateRank
3Dmodels114847.4%#64
Codemodels115346.9%#69
Data vizmodels117148.4%#58
Game devmodels113144.3%#72
UI componentsmodels114848.9%#63
Websitesmodels115847.1%#68
SVGmodels107843.1%#58

Head-to-head preference voting. How we filter and rank

Supported parameters

  • include_reasoning
  • max_tokens
  • reasoning
  • response_format
  • seed
  • stop
  • structured_outputs
  • temperature
  • tool_choice
  • tools
  • top_p

Call it

OpenAI-compatible: point your SDK at api.openkey.ai/v1 and use model google/gemini-2.5-flash.

Code sample language
curl https://api.openkey.ai/v1/chat/completions \
  -H "Authorization: Bearer $OPENKEY_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "google/gemini-2.5-flash",
    "messages": [{"role": "user", "content": "Hello"}]
  }'
import os
from openai import OpenAI

client = OpenAI(
    base_url="https://api.openkey.ai/v1",
    api_key=os.environ["OPENKEY_API_KEY"],
)

completion = client.chat.completions.create(
    model="google/gemini-2.5-flash",
    messages=[{"role": "user", "content": "Hello"}],
)
print(completion.choices[0].message.content)
import OpenAI from "openai";

const client = new OpenAI({
  baseURL: "https://api.openkey.ai/v1",
  apiKey: process.env.OPENKEY_API_KEY,
});

const completion = await client.chat.completions.create({
  model: "google/gemini-2.5-flash",
  messages: [{ role: "user", content: "Hello" }],
});
console.log(completion.choices[0].message.content);

Questions

How much does Gemini 2.5 Flash cost via API?
Through OpenKey, Gemini 2.5 Flash costs $0.309 per 1M input tokens and $2.58 per 1M output tokens. That is the provider price ($0.300 / $2.50) plus a flat 3% fee — nothing else.
What is Gemini 2.5 Flash's context window?
Gemini 2.5 Flash accepts up to 1.0M tokens of context and returns up to 66K tokens per request.
Is Gemini 2.5 Flash OpenAI-compatible?
Yes. Send requests to OpenKey's /v1/chat/completions endpoint with model "google/gemini-2.5-flash" using any OpenAI SDK — only the base URL and API key change.
What inputs does Gemini 2.5 Flash support?
Gemini 2.5 Flash accepts file, image, text, audio, video input and produces text output. Its knowledge cutoff is Jan 31, 2025.

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