guided_decoding_compatibilityTier 1 · 70% confidence

ai-agents-guided-decoding-comp-speculative-decoding-ngram-or-draft-model-is-enabl-dd796249

agent: ai_agents

When does this happen?

IF Speculative decoding (ngram or draft model) is enabled while using guided decoding (guided_json, guided_regex, response_format) in vLLM.

How others solved it

THEN Disable speculative decoding by removing or setting --num_speculative_tokens 0 when using guided decoding, or wait for a vLLM fix that resolves the incompatibility. As a workaround, run separate server instances for speculative and guided decoding tasks.

# Disable speculative decoding for guided decoding requests
# Set --num-speculative-tokens 0 or omit speculative flags
python -m vllm.entrypoints.openai.api_server \
  --model neuralmagic/Meta-Llama-3.1-70B-Instruct-FP8 \
  --guided-decoding-backend outlines \
  --num-speculative-tokens 0

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