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Model details

DeepSeek-R1

DeepSeek-R1 is a reasoning-focused language model designed to approach problems strategically, breaking them into smaller steps and arriving at solutions through chain-of-thought processes. Unlike traditional language models that excel at generation and translation but often struggle with complex logical inference, DeepSeek-R1 is built to think through challenges systematically, mimicking human-like cognitive processes. This design philosophy makes it particularly suited for tasks requiring deeper analysis, multi-step deduction, and problems that demand more than surface-level pattern matching.

DeepSeek-R1 emerged from a lineage of reinforcement learning-driven reasoning research, building upon its predecessor DeepSeek-R1-Zero, which demonstrated that large-scale RL without supervised fine-tuning could produce remarkable reasoning behaviors. However, R1-Zero exhibited issues such as endless repetition, poor readability, and language mixing that limited its practical utility. DeepSeek-R1 addresses these limitations by incorporating cold-start data into the training pipeline, refining the model's ability to generate coherent, readable outputs while preserving strong reasoning capabilities. With 671 billion total parameters and 37 billion active during inference, the model achieves performance comparable to leading proprietary reasoning systems while maintaining full transparency through open reasoning tokens, an MIT license, and publicly available technical documentation.

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Provider
Together AI
Model key
deepseek-ai/DeepSeek-R1
Release date
Jan 20, 2025
Last updated
Mar 24, 2025
Knowledge cutoff
2024-07
Input modalities
Output modalities
Capabilities

Cost

Input token cost
$3.00
Output token cost
$7.00

Limits

Output tokens
163,839 tokens
Context window
163,839 tokens

Transparent token rates

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Rates are shown per one million tokens. Combined means one million input plus one million output tokens.

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Latest news about DeepSeek-R1

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Coverage

DeepSeek-R1 is framed as a January 2025 open-source reasoning model that popularized visible chain-of-thought reasoning and rivaled OpenAI's o1 at substantially lower cost. The page notes R1 has been superseded by DeepSeek V4, with the hosted deepseek-reasoner alias retired on 24 July 2026. The MIT-licensed weights remain freely available on Hugging Face for download and self-hosting, supporting offline research and reproducibility. The site's documented strengths of R1 include chain-of-thought reasoning for complex problem-solving, strong code generation across languages, and state-of-the-art mathematical reasoning benchmarks at launch.

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Coverage

DeepSeek officially announced DeepSeek-R1 on January 20, 2025, as a reasoning model positioned on par with OpenAI-o1 across math, code, and reasoning tasks. The release emphasized large-scale reinforcement learning in post-training, with the technical report hosted on the DeepSeek-R1 GitHub repository describing the approach. The launch shipped under an MIT License for both code and model weights, enabling distillation and commercial use, and DeepSeek also open-sourced six distilled variants at 32B and 70B scale aimed at OpenAI-o1-mini-class performance. API access launched via the deepseek-reasoner alias at $0.14 per million input tokens (cache hit), $0.55 per million input tokens (cache miss), and $2.19 per million output tokens.

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