DeepSeek V4 Flash 0731 (free) API
About
Build advanced reasoning agents with DeepSeek V4 Flash 0731 (free), 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 Flash 0731 (free) via the OpenRouter API with up to 393K output tokens.
Capabilities
Input Modalities
text
Output Modalities
text
Reasoning
Yes
Structured Output
Yes
Tool Use
Yes
WeightsOpen
Limits
Context Window
1.0M
Tokens
Input Limit
1.0M
Tokens
Max Output
393K
Tokens
Pricing
Standard (per 1M tokens)
Input
Free
Output
Free
Frequently Asked Questions
DeepSeek V4 Flash 0731 (free) by OpenRouter costs Free per 1M input tokens and Free per 1M output tokens.
Model Details
ID
deepseek/deepseek-v4-flash-0731:free
Provider
OpenRouterFamily
deepseek-flash
Release Date
Jul 31, 2026
Knowledge Cutoff
May 1, 2025
API Integration
NPM Package
@openrouter/ai-sdk-provider
Environment Variables
OPENROUTER_API_KEY
API Base URL
https://openrouter.ai/api/v1