DeepSeek V4 Pro 0813 (on OpenRouter)
- ID
- 13723
- Status
- summarized
- Published
- 13 Aug 2026, 7:59 AM
- Fetched
- 14 Aug 2026, 6:58 AM
- Provider
- Simon Willison
- Category
- developer-ai
- Original URL
- https://simonwillison.net/2026/Aug/12/deepseek-v4-pro-0813/
- Source URL
- https://simonwillison.net/atom/everything/
Summary
- Score
- 4.0
- Created
- 14 Aug 2026, 6:58 AM
- Tags
- Audience
- ai_ml_learnersai_agent_users
What happened
Simon Willison notes that DeepSeek V4 Pro 0813 is now available via API on OpenRouter, with no official announcement page from DeepSeek. Open weights are likely but unconfirmed, given prior releases of DeepSeek-V4-Pro (April) and DeepSeek-V4-Flash-0731 (July). Willison observed visibly different outputs across the model's low, medium, and high reasoning levels, and benchmark numbers circulated only through a WeChat group, a deleted Reddit post, and an ASCII-art Hacker News table.
Why it matters
If you're already routing through OpenRouter, you can test V4 Pro 0813 today and compare its three reasoning levels against your current model picks—but there are no confirmed open weights, no official benchmarks, and no pricing detail in this post, so there's nothing actionable here for builders not already evaluating DeepSeek.
Discussion angle
The benchmark distribution path—WeChat group to deleted Reddit post to HN ASCII table—highlights how hard it is to get reliable, reproducible numbers for Chinese model releases; worth discussing how your team validates new models when official evals are missing or unverifiable.