Unverified50% confidenceFactExact time
The Messages/Chat Completions interfaces of vendors such as Anthropic and OpenAI all support prefilling parameters, and local inference frameworks (vLLM, llama.cpp, Transformers) can also implement prefilling by directly concatenating token sequences.
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
10/27/2026
First Seen
Valid until: 1/25/2027
Sources
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