Gemini 2.5 Flash API

google/gemini-2.5-flash
Fast, cost-effective multimodal AI with 1M-token context, excelling in coding and reasoning.
Context
1M tokens
Input
$0.39 / 1M tokens
Output
$3.25 / 1M tokens
Released
Sep 9, 2025

How to use Gemini 2.5 Flash API

Install any OpenAI-compatible SDK, point it at api.aimlapi.com/v1, and set the model to google/gemini-2.5-flash.
import requests

r = requests.post(
    "https://api.aimlapi.com/v1/chat/completions",
    headers={"Authorization": "Bearer " + AIMLAPI_KEY},
    json={
      "model": "google/gemini-2.5-flash",
      "messages": [
        {
          "role": "user",
          "content": "Hello!"
        }
      ]
    },
)
print(r.json())
const r = await fetch("https://api.aimlapi.com/v1/chat/completions", {
  method: "POST",
  headers: {
    Authorization: `Bearer ${process.env.AIMLAPI_KEY}`,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    "model": "google/gemini-2.5-flash",
    "messages": [
      {
        "role": "user",
        "content": "Hello!"
      }
    ]
  }),
});
console.log(await r.json());
curl -X POST https://api.aimlapi.com/v1/chat/completions \
  -H "Authorization: Bearer $AIMLAPI_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"google/gemini-2.5-flash","messages":[{"role":"user","content":"Hello!"}]}'

OpenAI-compatible — swap the base URL and it works with your existing SDK.

Gemini 2.5 Flash API Pricing

TypePrice
Input
$0.39 / 1M tokens
Output
$3.25 / 1M tokens
Cached input
$0.39 / 1M tokens

Gemini 2.5 Flash Benchmarks

BenchmarkScoreWhat it measuresSourceRetrieved
Intelligence
13.1
Composite score across standardised reasoning, knowledge and problem-solving evaluations, measured independently by Artificial AnalysisSourceSeptember 12, 2026
Math
73.3
Composite score across standardised mathematics evaluations, measured independently by Artificial AnalysisSourceSeptember 12, 2026

Gemini 2.5 Flash vs other models

ModelInputOutputContextBest for
$0.39 / 1M tokens
$3.25 / 1M tokens
1M tokens
Coding + agents
$6.5 / 1M tokens
$39 / 1M tokens
1M tokens
Reasoning + agents
$2.6 / 1M tokens
$13 / 1M tokens
1M tokens
Balanced coding + agents
$3.9 / 1M tokens
$19.5 / 1M tokens
1M tokens
Long-context, multimodal & agentic workflows
$0.65 / 1M tokens
$3.9 / 1M tokens
1M tokens
Reasoning + agents

Frequently asked questions

Gemini 2.5 Flash has a 1,000,000 tokens context window and can return up to 65,536 tokens.

Gemini 2.5 Flash takes image, text as input and returns text.

Use google/gemini-2.5-flash as the model id. Requests go to https://api.aimlapi.com/v1/chat/completions.

Gemini 2.5 Flash became available on September 9, 2025.

Gemini 2.5 Flash is priced at input $0.39 / 1M tokens, output $3.25 / 1M tokens, cached input $0.39 / 1M tokens.

Yes, Gemini 2.5 Flash can stream responses as they are generated.

Yes, Gemini 2.5 Flash accepts image input alongside text.

Gemini 2.5 Flash was built by Google.

Yes, it supports function calling, including parallel tool calls.

Yes, it supports structured output generation.

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