Simon Willison 8/12/2026

DeepSeek V4 Pro 0813 (on OpenRouter)

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This article announces the release of DeepSeek V4 Pro 0813, the latest DeepSeek Pro model, available via API only. The author links to OpenRouter because DeepSeek lacks an official announcement page. They speculate about open weights release, noting previous models had them. The article also mentions observing different pelican images across reasoning levels (low, medium, high), a unique behavior. Benchmarks were shared via DeepSeek's WeChat group, Reddit (deleted), and Hacker News. The post is dated 12th August 2026.

DeepSeek V4 Pro 0813 (on OpenRouter)

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