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DeepSeek V4 Pro 0813 (on OpenRouter) Simon Willison’s Weblog Subscribe 12th August 2026 - Link Blog DeepSeek V4 Pro 0813 (on OpenRouter). The latest DeepSeek Pro model is now available, via API only. I had to link to OpenRouter because DeepSeek don't have any obvious announcement page for their new model. I haven't been able to confirm if they plan to release the open weights, but given the weights are available for both April's deepseek-ai/DeepSeek-V4-Pro and July's deepseek-ai/DeepSeek-V4-Flash-0731 it seems likely. Interestingly I got very different looking pelicans for the three different reasoning levels of low, medium, and high. I've not noticed this kind of difference from any other model: Low: Medium: High: In terms of benchmarks... as far as I can tell those were released to the Official DeepSeek WeChat Group, then copied and pasted into a post on Reddit which was deleted by the moderators for being "low-effort", then copied into this ASCII-art table on Hacker News. Recent articles Now we have a timeline of the OpenAI accidental attack against Hugging Face - 7th August 2026 One-shotting a Raccoon Heist game using Claude Fable 5 - 5th August 2026 New release of LLM adds support for reasoning traces, OpenAI Responses, server-side tools, and smarter logging - 4th August 2026 This is a link post by Simon Willison, posted on 12th August 2026. ai 2,184 generative-ai 1,935 llms 1,902 pelican-riding-a-bicycle 133 deepseek 35 llm-release 223 ai-in-china 104 Monthly briefing Sponsor me for $10/month and get a curated email digest of the month's most important LLM developments. Pay me to send you less! Sponsor & subscribe Disclosures Colophon © 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026