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Gemini 2.5 Flash Lite Preview 09-2025

GoogleReleased Sep 25, 2025

Gemini 2.5 Flash-Lite is a lightweight reasoning model in the Gemini 2.5 family, optimized for ultra-low latency and cost efficiency. It offers improved throughput, faster token generation, and better performance...

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
Sep 25, 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$0.100$0.0030$0.103
Output$0.400$0.012$0.412
Cache read$0.010$0.0003$0.010
Cache write$0.083$0.0025$0.086

Benchmarks

Design Arena

CategoryEloWin rateRank
3Dmodels104436.5%#85
Codemodels113047%#75
Data vizmodels113445.5%#71
Game devmodels111345.9%#75
UI componentsmodels107741.4%#77
Websitesmodels114248.1%#75

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-lite-preview-09-2025.

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-lite-preview-09-2025",
    "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-lite-preview-09-2025",
    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-lite-preview-09-2025",
  messages: [{ role: "user", content: "Hello" }],
});
console.log(completion.choices[0].message.content);

Questions

How much does Gemini 2.5 Flash Lite Preview 09-2025 cost via API?
Through OpenKey, Gemini 2.5 Flash Lite Preview 09-2025 costs $0.103 per 1M input tokens and $0.412 per 1M output tokens. That is the provider price ($0.100 / $0.400) plus a flat 3% fee — nothing else.
What is Gemini 2.5 Flash Lite Preview 09-2025's context window?
Gemini 2.5 Flash Lite Preview 09-2025 accepts up to 1.0M tokens of context and returns up to 66K tokens per request.
Is Gemini 2.5 Flash Lite Preview 09-2025 OpenAI-compatible?
Yes. Send requests to OpenKey's /v1/chat/completions endpoint with model "google/gemini-2.5-flash-lite-preview-09-2025" using any OpenAI SDK — only the base URL and API key change.
What inputs does Gemini 2.5 Flash Lite Preview 09-2025 support?
Gemini 2.5 Flash Lite Preview 09-2025 accepts text, image, file, audio, video input and produces text output. Its knowledge cutoff is Jan 31, 2025.

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