DeepSeek Reasoner

DeepSeek Reasoner

Developer	DeepSeek
Release date	December 1, 2025
Family	DeepSeek
Level
Context window	1M tokens
Max output	384K tokens
Input	Text
Output	Text
Knowledge cutoff	2025-09
Weights	Open weights
Website	deepseek.com

Part of a series on

Context: 1Mtokens
Released: 11mo ago
Size: —parameters

Specifications

Model

Developer: DeepSeek
Family: DeepSeek
Type: Language model
Released: December 1, 2025
Model ID: deepseek/deepseek-reasoner

Capabilities

Input → output: Text → Text
Max output: 384K tokens
Knowledge cutoff: 2025-09

Weights

Openness: Open weights

Sources:models.dev

Metadata synced Nov 3, 2026, 11:17 PM UTC

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