Gemini 2.5 Flash Preview 09-2025

gemini-2.5-flash-preview-09-2025

Gemini 2.5 Flash Preview (Sept 2025) is Google's high-performance workhorse model built for advanced reasoning, coding, math, and scientific tasks. With built-in “thinking” capabilities, it delivers more accurate, context-aware answers across complex problems.

Context: 1.0M tokens
Endpoint

Service Status

Status information temporarily unavailable

Apertis cannot confirm the current service state. This is not a report that the model is down.

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Pricing

Input$0.15 / 1M

Output$1.25 / 1M

Cache Write (5m)$0.15 / 1M

Cache Write (1h)$0.15 / 1M

Cache Read$0.15 / 1M

Web Search$0 / 1M

Quick Start

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Endpoint

python

from openai import OpenAI client = OpenAI(    api_key="YOUR_API_KEY",    base_url="https://api.apertis.ai/v1") response = client.chat.completions.create(    model="gemini-2.5-flash-preview-09-2025",    messages=[        {"role": "user", "content": "Hello!"}    ],    max_tokens=1024,    temperature=0.7) print(response.choices[0].message.content) # Optional: Enable context compression to reduce token usage# response = client.chat.completions.create(#     model="gemini-2.5-flash-preview-09-2025",#     messages=[{"role": "user", "content": "Hello!"}],#     extra_body={"compression": {"enabled": True, "model": "gpt-4.1-mini"}}# )

Supported Parameters

API docs

Common7 params

modelmessagesmax_tokenstemperaturetop_pstreamtools

Extended4 params

reasoning_effortstream_optionsthinkingextra_body

Cursor IDE Model IDs

Use these namespaced identifiers in Cursor IDE to avoid conflicts with built-in models.

gemini-2.5-flash-preview-09-2025

Compare with Other Models

See how this model compares to others from the same provider.

Gemini 2.5 Flash Preview 05-20 (thinking)

Gemini 2.5 Flash Preview (May 2025) is Google's high-performance general model built for advanced reasoning, coding, math, and science. It includes built-in “thinking” features to deliver more accurate, context-aware answers.

Context: 1.0M
Input: $0.075/M
Output: $1.75/M

Gemini 2.5 Flash Lite Preview 09-2025

Gemini 2.5 Flash-Lite is a lightweight, low-latency model focused on speed and cost efficiency. It generates tokens quickly and outperforms earlier Flash models on common benchmarks. “Thinking” (multi-pass reasoning) is off by default for maximum speed, but can be turned on through the Reasoning API when deeper reasoning is needed.

Context: 1.0M
Input: $0.05/M
Output: $0.20/M

Gemini 2.5 Flash Lite Preview 06-17

Gemini 2.5 Flash-Lite is a smaller, low-latency model focused on speed and cost efficiency. It delivers faster generation and better benchmark performance than earlier Flash models. Thinking mode is off by default for maximum speed, but developers can enable it when they want deeper reasoning at a higher cost.

Context: 1.0M
Input: $0.025/M
Output: $0.10/M

Gemini 2.5 Flash Preview (thinking)

Context: 1.0M
Input: $0.075/M
Output: $1.75/M