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Vercel AI Gateway

FLUX.2 [klein] 4B API

Vercel AI Gateway
About

FLUX.2 [klein] 4B is a high-performance LLM available via the Vercel AI Gateway API, ideal for scalable text generation and natural language processing. This model delivers available completely free of charge. Access FLUX.2 [klein] 4B via the Vercel AI Gateway API with reliable low-latency inference.

Capabilities

Input Modalities

text

Output Modalities

image
Reasoning
No
Structured Output
No
Tool Use
No
WeightsClosed
Temperature
Adjustable
Attachment
Not Supported
Limits
Context Window
N/A

Tokens

Input Limit
N/A

Tokens

Max Output
N/A

Tokens

Pricing

Standard (per 1M tokens)

Input
Free
Output
Free
Frequently Asked Questions

FLUX.2 [klein] 4B by Vercel AI Gateway costs Free per 1M input tokens and Free per 1M output tokens.

Model Details
ID
bfl/flux-2-klein-4b
Provider
Vercel AI Gateway
Family
flux
Release Date
Jun 8, 2026
Knowledge Cutoff
N/A
API Integration
NPM Package
@ai-sdk/gateway
Environment Variables
AI_GATEWAY_API_KEY
Documentation