---
id: "deepseek/deepseek-r1-0528"
also: ["deepseek/deepseek-r1-0528", "deepseek-ai/DeepSeek-R1-0528", "hf/deepseek-ai/DeepSeek-R1-0528"]
cheapest_list_usd_per_m: "0.5 in, 2.15 out, at deepinfra on hf"
cheapest_effective_usd_per_m: "0.4378 in, 2.1496 out, at deepinfra/fp4 on openrouter"
context: 163840
max_output: 32768
input: ["text"]
output: ["text"]
released: "2025-05-28"
api: ["/api/v1/chat/completions", "/api/v1/completions", "/api/v1/messages", "/api/v1/responses"]
params: ["frequency_penalty", "include_reasoning", "logit_bias", "logprobs", "max_tokens", "min_p", "presence_penalty", "reasoning", "repetition_penalty", "response_format", "seed", "stop", "structured_outputs", "temperature", "tool_choice", "tools", "top_k", "top_logprobs", "top_p"]
endpoints: 7
gateways: "openrouter (4), hf (3)"
no_training: 4
trains: 0
retains_prompts: 1
---
# DeepSeek: R1 0528

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...