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DeepSeek

DeepSeek Reasoner API

DeepSeek
About

Build advanced reasoning agents with DeepSeek Reasoner, a specialized AI model optimized for complex logic and chain-of-thought tasks. This model delivers cost-effective pricing at $0.28/1M input and $0.42/1M output tokens, native tool calling support, open weights architecture. Access DeepSeek Reasoner via the DeepSeek API with up to 64K output tokens.

Capabilities

Input Modalities

text

Output Modalities

text
Reasoning
Yes
Structured Output
No
Tool Use
Yes
WeightsOpen
Temperature
Adjustable
Attachment
Supported
Limits
Context Window
128K

Tokens

Input Limit
128K

Tokens

Max Output
64K

Tokens

Pricing

Standard (per 1M tokens)

Input
$0.28
Output
$0.42

Caching (per 1M tokens)

Read
$0.03
Frequently Asked Questions

DeepSeek Reasoner by DeepSeek costs $0.28 per 1M input tokens and $0.42 per 1M output tokens. Cached reads cost $0.03 per 1M tokens.

Model Details
ID
deepseek-reasoner
Provider
DeepSeek
Family
deepseek-thinking
Release Date
Dec 1, 2025
Knowledge Cutoff
Sep 1, 2025
API Integration
NPM Package
@ai-sdk/openai-compatible
Environment Variables
DEEPSEEK_API_KEY
API Base URL
https://api.deepseek.com
Documentation