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  5. Speculative Decoding
Inference & Deployment

Speculative Decoding

Speculative decoding accelerates generation by using a faster draft process to propose tokens that a target model verifies in groups.

Ask Melo about this← all terms

Accepted proposals allow several output positions to advance with fewer target-model steps, while rejected tokens are corrected according to the verification algorithm. Proper methods preserve the target distribution despite the draft approximation.

Related terms

Inference EngineContinuous BatchingBeam SearchLogitClosed WeightsDFlash

Where Speculative Decoding comes up

  • DFlash-MLX Brings Lossless Speculative Decoding to Apple Silicon — Up to ~189 tok/s on M5 Max
  • DeepSeek DSpark: speculative decoding for V4 Flash and Pro (51–400% faster inference guide 2026)
  • Uno: A Lossless Diffusion Adapter That Speeds Up LLM Generation 2.2x
  • Lily: Perplexity's Custom Inference Engine for Apple Silicon