DeepSeek V4 Pro 0813 (on OpenRouter)

Simon Willison's Blog Models
deepseek model-release api openrouter benchmarks open-weights

Summary

Simon Willison covers the release of DeepSeek V4 Pro 0813, available via API on OpenRouter, noting the likely open weights and noticeable differences between reasoning levels.

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Cached at: 08/13/26, 03:37 PM

# DeepSeek V4 Pro 0813 (on OpenRouter) Source: [https://simonwillison.net/2026/Aug/12/deepseek-v4-pro-0813/](https://simonwillison.net/2026/Aug/12/deepseek-v4-pro-0813/) **[DeepSeek V4 Pro 0813 \(on OpenRouter\)](https://openrouter.ai/deepseek/deepseek-v4-pro-0813)**\. 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](https://huggingface.co/deepseek-ai/DeepSeek-V4-Pro)and July's[deepseek\-ai/DeepSeek\-V4\-Flash\-0731](https://huggingface.co/deepseek-ai/DeepSeek-V4-Flash-0731)it seems likely\. Interestingly I got[*very*different looking pelicans](https://tools.simonwillison.net/markdown-svg-renderer#url=https%3A%2F%2Fgist.github.com%2Fsimonw%2Fc1108a380593547c2def5863bca63160)for the three different reasoning levels of low, medium, and high\. I've not noticed this kind of difference from any other model: Low: ![Flat vector illustration of a white pelican with a large orange beak, wearing a straw hat with an orange band, riding a teal road bicycle in profile, set against a pale cream circle with a dashed outline and small motion marks trailing behind.](https://static.simonwillison.net/static/2026/deepseek-pro-low.png) Medium: ![A similar cartoon pelican cycling, drawn in a looser outlined style: the bird's body is mostly white line art, its orange beak pouch hangs open under a yellow cap, a long red tongue streams backwards towards a yellow sun, and a small blue fish sits on a tray by the handlebars of a green bicycle whose wheels are drawn as broken yellow arcs.](https://static.simonwillison.net/static/2026/deepseek-pro-medium.png) High: ![The pelican again, this time on a red bicycle against a pale blue background, with a bright yellow beak and pouch, a purple pennant flag on the back, a wicker front basket holding a small fish, and black musical notes floating in the top right corner.](https://static.simonwillison.net/static/2026/deepseek-pro-high.png) 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](https://www.reddit.com/r/LocalLLaMA/comments/1vmi0fg/removed_by_moderator/)which was deleted by the moderators for being "low\-effort", then copied into[this ASCII\-art table on Hacker News](https://news.ycombinator.com/item?id=49274600#49275180)\.

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