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FrontierThe story, in brief

DeepSeek V4 Pro 0813 (on OpenRouter)

DeepSeek ships V4 Pro 0813 on OpenRouter. Early signals on reasoning and cost vs. frontier rivals.

Reporting by Simon Willison 1 min brief
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The KeyNews take

Why it matters

DeepSeek continues iterating on its frontier reasoning model, making it widely available via OpenRouter API. A datapoint on the lab-race velocity and the cost-capability envelope practitioners are evaluating.

The key facts

5 to know

  1. DeepSeek V4 Pro 0813 release

  2. Available on OpenRouter API

  3. Timing: August 12, 2026

  4. Frontier model iteration with focus on reasoning

  5. Cost-capability positioning vs. competitors

Go to the source

Simon Willisonsimonwillison.net

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