DeepSeek V4 Flash 0731 API
About
Build advanced reasoning agents with DeepSeek V4 Flash 0731, a specialized AI model optimized for complex logic and chain-of-thought tasks. This model delivers cost-effective pricing at $0.14/1M input and $0.27/1M output tokens, native tool calling support, open weights architecture. Access DeepSeek V4 Flash 0731 via the OpenReason API with up to 384K 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
384K
Tokens
Pricing
Standard (per 1M tokens)
Input
$0.14
Output
$0.27
Frequently Asked Questions
DeepSeek V4 Flash 0731 by OpenReason costs $0.14 per 1M input tokens and $0.27 per 1M output tokens.
Model Details
ID
deepseek-ai/deepseek-v4-flash-0731
Provider
OpenReasonFamily
deepseek-flash
Release Date
Jul 31, 2026
Knowledge Cutoff
May 1, 2025
API Integration
NPM Package
@ai-sdk/openai-compatible
Environment Variables
OPENREASON_API_KEY
API Base URL
https://api.openreason.app/v1