Gemini 2.5 Flash Preview 09-25 API
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
textimageaudiovideo
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
VertexFamily
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