DeepSeek V4 Pro 0813 Released via API on OpenRouter
DeepSeek has released its latest Pro model, DeepSeek V4 Pro 0813, available exclusively via API. The model is accessible through OpenRouter, as DeepSeek has not published a dedicated announcement page. The release follows the pattern of previous DeepSeek models, with open weights likely to follow, given that both the April release (deepseek-ai/DeepSeek-V4-Pro) and July release (deepseek-ai/DeepSeek-V4-Flash-0731) had their weights made available. Notably, the model exhibits distinct output variations across different reasoning levels (low, medium, high), a feature not observed in other models. Benchmark results were initially shared in the Official DeepSeek WeChat Group, then reposted on Reddit (where the post was deleted for being 'low-effort'), and finally circulated via an ASCII-art table on Hacker News. The release was highlighted by Simon Willison in a blog post dated 12th August 2026.
Key facts
- DeepSeek V4 Pro 0813 is available via API only.
- The model is accessible through OpenRouter.
- DeepSeek has not published an official announcement page.
- Open weights are likely to be released, following precedent.
- Previous models with open weights: deepseek-ai/DeepSeek-V4-Pro (April) and deepseek-ai/DeepSeek-V4-Flash-0731 (July).
- The model shows different outputs for low, medium, and high reasoning levels.
- Benchmarks were shared via WeChat, Reddit, and Hacker News.
- Simon Willison posted about the release on 12th August 2026.
Entities
Institutions
- DeepSeek
- OpenRouter
- Hacker News