DeepSeek V4 Inference Accelerated by 60%+: Deep Dive into Speculative Decoding
AccBalanced · x · 2026-08-11
In celebration of releasing DeepSeek-V4-Flash-0731-Fast, the author provides a deep dive into the underlying DSpark technology. Without directly modifying the model, DSpark accelerates V4 inference speed per user by 60% to 85%.
The article explains the mechanics of speculative decoding from first principles:
- A cheap draft model guesses a block of tokens, which the large target model verifies in a single forward pass, keeping the longest correct prefix.
- Verification is essentially free because tokens are accepted with probability min(1, target prob / draft prob). The output distribution exactly matches the target model's, meaning the draft only saves time without altering the answer.
- To go faster, there are only three paths: draft faster, draft better, or verify smarter.
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