DeepSeek V4.1 Flash API
About
Build advanced reasoning agents with DeepSeek V4.1 Flash, a specialized AI model optimized for complex logic and chain-of-thought tasks. This model delivers available completely free of charge, native tool calling support, open weights architecture. Access DeepSeek V4.1 Flash via the NaN API with up to 384K output tokens.
Capabilities
Input Modalities
textimage
Output Modalities
text
Reasoning
Yes
Structured Output
Yes
Tool Use
Yes
WeightsOpen
Temperature
Adjustable
Attachment
Supported
Limits
Context Window
1.0M
Tokens
Input Limit
1.0M
Tokens
Max Output
384K
Tokens
Pricing
Standard (per 1M tokens)
Input
Free
Output
Free
Frequently Asked Questions
DeepSeek V4.1 Flash by NaN costs Free per 1M input tokens and Free per 1M output tokens.
Model Details
ID
deepseek-v4-flash
Provider
NaNFamily
deepseek-flash
Release Date
Sep 10, 2026
Knowledge Cutoff
May 1, 2025
API Integration
NPM Package
@ai-sdk/openai-compatible
Environment Variables
NAN_API_KEY
API Base URL
https://api.nan.builders/v1