R1 0528
Summary
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.
May 28th update to the [original DeepSeek R1](/deepseek/deepseek-r1) Performance on par with [OpenAI o1](/openai/o1), but open-sourced and with fully open reasoning tokens. It's 671B parameters in size, with 37B active...
Last verified 4 Oct 2026. Every figure on this page links to its source.
Specifications
| Developer | DeepSeek |
|---|---|
| Release date | 28 May 2025 [OpenRouter] |
| Status | Generally available |
| Weights | Open weights [Hugging Face] |
| License | mit [Hugging Face] |
| Parameters | 685B [Hugging Face] |
| Context window | 164K (163,840 tokens) [OpenRouter] |
| Max output | 33K tokens [OpenRouter] |
| Knowledge cutoff | 31 Mar 2025 [OpenRouter] |
| Input | Text [OpenRouter] |
| Output | Text [OpenRouter] |
| Reasoning mode | Yes [OpenRouter] |
| Tool calling | Yes [OpenRouter] |
| Structured output | Yes [OpenRouter] |
| Hugging Face | deepseek-ai/DeepSeek-R1-0528 [Hugging Face] |
R1 0528 API pricing by provider
USD per million tokens. Sorted by input price.
| Provider | Input | Output | Cached input | Context | Source |
|---|---|---|---|---|---|
| OpenRouter deepseek/deepseek-r1-0528 | $0.50 | $2.15 | $0.35 | 164K | OpenRouter, 4 Oct 2026 |
Frequently asked questions
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.
Change history
No changes detected since we started tracking this model. We re-check every source daily.