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[ARTICLE · art-94546] src=simonwillison.net ↗ pub= topic=artificial-intelligence verified=true sentiment=· neutral

DeepSeek V4 Pro 0813 (on OpenRouter)

DeepSeek released DeepSeek V4 Pro 0813 on OpenRouter, following the open-weights releases of DeepSeek-V4-Pro in April and DeepSeek-V4-Flash-0731 in July, though open weights for the new version are not yet confirmed. Developer Simon Willison observed notably different outputs for the model's low, medium, and high reasoning levels, a variation he has not seen from other models. Benchmark results were shared via DeepSeek's official WeChat group, then reposted on Reddit (where moderators deleted the post) and later on Hacker News.

read1 min views1 publishedAug 12, 2026

DeepSeek V4 Pro 0813 (on OpenRouter) 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.

Tags: ai, generative-ai, llms, pelican-riding-a-bicycle, deepseek, llm-release, ai-in-china

source & further reading
simonwillison.net — original article Quoting Florian Herrengt Muse Glimmer Introducing Muse Glimmer
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