DeepSeek V4 Pro 0813 Appears on OpenRouter With No Announcement

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DeepSeek released its V4 Pro 0813 model on 12 August 2026, making it accessible via API on OpenRouter but publishing no official announcement page of its own. The release was flagged by developer Simon Willison, who noted he had to link to OpenRouter because DeepSeek provided no direct announcement.

The model is currently API-only. Whether DeepSeek will release open weights remains unconfirmed, though the pattern with earlier releases points toward that outcome - weights for both April’s DeepSeek-V4-Pro and July’s DeepSeek-V4-Flash-0731 are publicly available on Hugging Face, making a similar release here seem likely.

One technical curiosity Willison noted: the model produces noticeably different outputs depending on whether reasoning is set to low, medium, or high - a variation he described as unlike anything he had observed with other models.

The benchmark situation is unusually murky. According to Willison, performance figures were released exclusively to DeepSeek’s official WeChat group, from where they were copied into a Reddit post that moderators deleted for being “low-effort,” and then reproduced in an ASCII-art table on Hacker News. No benchmark data has been formally published by the company.

For developers and builders working with frontier models, the practical picture here is straightforward but worth noting: a capable model appears to be available on OpenRouter right now, but without official documentation or verified benchmarks, any production decision rests on direct testing rather than published specs. The reasoning-level sensitivity Willison flagged also suggests that default API settings may produce meaningfully different results from those obtained at higher reasoning budgets - worth checking before committing to a prompt design or cost estimate.

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