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 cost-effective pricing at $0.60/1M input and $1.20/1M output tokens, native tool calling support, open weights architecture. Access DeepSeek V4.1 Flash via the Synthetic API with up to 66K output tokens.
Capabilities
Input Modalities
textimage
Output Modalities
text
Reasoning
Yes
Structured Output
Limits
Context Window
524K
Tokens
Input Limit
524K
Tokens
Max Output
66K
Tokens
Pricing
Standard (per 1M tokens)
Input
$0.60
Output
$1.20
Caching (per 1M tokens)
Read
$0.03
Frequently Asked Questions
DeepSeek V4.1 Flash by Synthetic costs $0.60 per 1M input tokens and $1.20 per 1M output tokens. Cached reads cost $0.03 per 1M tokens.
Model Details
ID
hf:deepseek-ai/DeepSeek-V4.1-Flash
Provider
SyntheticFamily
deepseek-flash
Release Date
Sep 10, 2026
Knowledge Cutoff
May 1, 2025
API Integration
NPM Package
@ai-sdk/openai-compatible
Environment Variables
SYNTHETIC_API_KEY
API Base URL
https://api.synthetic.new/openai/v1