# R1 0528

> R1 0528 is an open-weight language model from DeepSeek, released on 28 May 2025. It accepts text and generates text, with a 164K-token context window and up to 33K output tokens per response. As of 4 Oct 2026, the lowest listed API price is $0.50 per million input tokens and $2.15 per million output tokens (OpenRouter), across 1 provider we track.

Source page: https://www.aimodel.directory/models/deepseek-r1-0528
Last verified: 4 Oct 2026

## Specifications

- **Developer:** DeepSeek
- **Release date:** 28 May 2025 (source: OpenRouter, https://openrouter.ai/deepseek/deepseek-r1-0528)
- **Status:** Generally available
- **Weights:** Open weights (source: Hugging Face, https://huggingface.co/deepseek-ai/DeepSeek-R1-0528)
- **License:** mit (source: Hugging Face, https://huggingface.co/deepseek-ai/DeepSeek-R1-0528)
- **Parameters:** 685B (source: Hugging Face, https://huggingface.co/deepseek-ai/DeepSeek-R1-0528)
- **Context window:** 164K (163,840 tokens) (source: OpenRouter, https://openrouter.ai/deepseek/deepseek-r1-0528)
- **Max output:** 33K tokens (source: OpenRouter, https://openrouter.ai/deepseek/deepseek-r1-0528)
- **Knowledge cutoff:** 31 Mar 2025 (source: OpenRouter, https://openrouter.ai/deepseek/deepseek-r1-0528)
- **Input:** Text (source: OpenRouter, https://openrouter.ai/deepseek/deepseek-r1-0528)
- **Output:** Text (source: OpenRouter, https://openrouter.ai/deepseek/deepseek-r1-0528)
- **Reasoning mode:** Yes (source: OpenRouter, https://openrouter.ai/deepseek/deepseek-r1-0528)
- **Tool calling:** Yes (source: OpenRouter, https://openrouter.ai/deepseek/deepseek-r1-0528)
- **Structured output:** Yes (source: OpenRouter, https://openrouter.ai/deepseek/deepseek-r1-0528)
- **Hugging Face:** deepseek-ai/DeepSeek-R1-0528 (source: Hugging Face, https://huggingface.co/deepseek-ai/DeepSeek-R1-0528)

## API pricing (USD per 1M tokens)

| Provider | Input | Output | Cached input | Context |
|---|---|---|---|---|
| OpenRouter | $0.50 | $2.15 | $0.35 | 164K |

## FAQ

### What is the context window of R1 0528?

R1 0528 has a context window of 163,840 tokens (164K) and can generate up to 32,768 tokens in a single response, according to OpenRouter.

### How much does the R1 0528 API cost?

R1 0528 is listed from $0.50 per million input tokens and $2.15 per million output tokens (OpenRouter). Prices last verified 4 Oct 2026.

### Is R1 0528 open source?

R1 0528 is an open-weight model: its weights are published on Hugging Face as deepseek-ai/DeepSeek-R1-0528 under the mit license. Check the license terms before commercial use.

### When was R1 0528 released?

DeepSeek released R1 0528 on 28 May 2025, according to OpenRouter.

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Data licensed CC BY 4.0. Cite as: AI Model Directory, "R1 0528", https://www.aimodel.directory/models/deepseek-r1-0528