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OpenKey

Gemini 2.5 Pro

GoogleReleased Jun 17, 2025

Gemini 2.5 Pro is Google’s state-of-the-art AI model designed for advanced reasoning, coding, mathematics, and scientific tasks. It employs “thinking” capabilities, enabling it to reason through responses with enhanced accuracy...

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

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$1.25$0.037$1.29
Output$10.00$0.300$10.30
Cache read$0.125$0.0037$0.129
Cache write$0.375$0.011$0.386

Benchmarks

Artificial Analysis

Intelligence index
25.8
Coding index
33.3
Agentic index
7.1

Design Arena

CategoryEloWin rateRank
3Dmodels115952.2%#57
Codemodels120358.3%#51
Data vizmodels129071.8%#12
Game devmodels117855.1%#56
UI componentsmodels120060.5%#48
Websitesmodels121058.8%#49

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-pro.

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-pro",
    "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-pro",
    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-pro",
  messages: [{ role: "user", content: "Hello" }],
});
console.log(completion.choices[0].message.content);

Questions

How much does Gemini 2.5 Pro cost via API?
Through OpenKey, Gemini 2.5 Pro costs $1.29 per 1M input tokens and $10.30 per 1M output tokens. That is the provider price ($1.25 / $10.00) plus a flat 3% fee — nothing else.
What is Gemini 2.5 Pro's context window?
Gemini 2.5 Pro accepts up to 1.0M tokens of context and returns up to 66K tokens per request.
Is Gemini 2.5 Pro OpenAI-compatible?
Yes. Send requests to OpenKey's /v1/chat/completions endpoint with model "google/gemini-2.5-pro" using any OpenAI SDK — only the base URL and API key change.
What inputs does Gemini 2.5 Pro support?
Gemini 2.5 Pro accepts text, image, file, audio, video input and produces text output. Its knowledge cutoff is Jan 31, 2025.

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