# DeepSeek R1 0528: AI model fact sheet

- **Provider:** deepseek
- **Released:** 2025-05-28
- **Context window:** 163,840 tokens
- **Parameters:** 671B (37B active)
- **API pricing:** $0.000 / 1M input, $0.000 / 1M output
- **OpenRouter ID:** deepseek/deepseek-r1-0528:free
- **Capabilities:** conversation, reasoning, code-generation, analysis

DeepSeek R1 0528 is the May 28th update to the original DeepSeek R1. Performance on par with OpenAI o1, but open-sourced and with fully open reasoning tokens. It's 671B parameters in size, with 37B active in an inference pass. Fully open-source model.

## Benchmarks

| Benchmark | Score |
| --- | --- |
| SWE-bench Verified | 57.6% |
| LiveCodeBench | 73.3% |

Source: real side-by-side outputs, pricing and specs at https://rival.tips/models/deepseek-r1-0528