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Vertex

Gemini 2.5 Flash Preview 09-25 API

Vertex
About

Build advanced reasoning agents with Gemini 2.5 Flash Preview 09-25, a specialized AI model optimized for complex logic and chain-of-thought tasks. This model delivers cost-effective pricing at $0.30/1M input and $2.50/1M output tokens, native tool calling support. Access Gemini 2.5 Flash Preview 09-25 via the Vertex API with up to 66K output tokens.

Capabilities

Input Modalities

textimageaudiovideopdf

Output Modalities

text
Reasoning
Yes
Structured Output
No
Tool Use
Yes
WeightsClosed
Temperature
Adjustable
Attachment
Supported
Limits
Context Window
1.0M

Tokens

Input Limit
1.0M

Tokens

Max Output
66K

Tokens

Pricing

Standard (per 1M tokens)

Input
$0.30
Output
$2.50

Caching (per 1M tokens)

Read
$0.07
Write
$0.38
Frequently Asked Questions

Gemini 2.5 Flash Preview 09-25 by Vertex costs $0.30 per 1M input tokens and $2.50 per 1M output tokens. Cached reads cost $0.07 per 1M tokens. Cache writes cost $0.38 per 1M tokens.

Model Details
ID
gemini-2.5-flash-preview-09-2025
Provider
Vertex
Family
gemini-flash
Release Date
Sep 25, 2025
Knowledge Cutoff
Jan 1, 2025
API Integration
NPM Package
@ai-sdk/google-vertex
Environment Variables
GOOGLE_VERTEX_PROJECT
GOOGLE_VERTEX_LOCATION
GOOGLE_APPLICATION_CREDENTIALS
Documentation