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DeepSeek Silently Swaps Its Flagship API Endpoint to the V4 Pro 0813 Build — and the Open Weights Stay at the April Preview
On August 12, 2026, DeepSeek switched its official deepseek-v4-pro API endpoint from the April preview build to a new 0813 build, with Vercel's AI Gateway picking up the updated weights by default under the same model ID so existing code changes silently. The 1.6-trillion-parameter MoE (49B active per token) is served at $0.435 in / $0.87 out per million tokens at one million tokens of context. Notably, the Hugging Face repos still host the April preview artifacts with no announced timeline for publishing 0813 weights — a widening gap between DeepSeek's hosted model and what it actually open-sources.
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