DeepSeek V3.1 Terminus API
About
Build advanced reasoning agents with DeepSeek V3.1 Terminus, a specialized AI model optimized for complex logic and chain-of-thought tasks. This model delivers cost-effective pricing at $0.27/1M input and $1.00/1M output tokens, native tool calling support, open weights architecture. Access DeepSeek V3.1 Terminus via the OpenRouter API with up to 147K output tokens.
Capabilities
Input Modalities
text
Output Modalities
text
Reasoning
Yes
Structured Output
Yes
Tool Use
Yes
WeightsOpen
Limits
Context Window
164K
Tokens
Input Limit
164K
Tokens
Max Output
147K
Tokens
Pricing
Standard (per 1M tokens)
Input
$0.27
Output
$1.00
Frequently Asked Questions
DeepSeek V3.1 Terminus by OpenRouter costs $0.27 per 1M input tokens and $1.00 per 1M output tokens.
Model Details
ID
deepseek/deepseek-v3.1-terminus
Provider
OpenRouterFamily
deepseek
Release Date
Sep 22, 2025
Knowledge Cutoff
Mar 31, 2025
API Integration
NPM Package
@openrouter/ai-sdk-provider
Environment Variables
OPENROUTER_API_KEY
API Base URL
https://openrouter.ai/api/v1