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Chat prefix completion

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Distinguish assistant-prefix continuation from full conversation generation.

Not assumed from chat compatibility#

An assistant prefix is a model-specific continuation control. Ordinary chat-completions support does not prove prefix=true, hidden reasoning prefixes or arbitrary assistant prefill. Unsupported prefix options must be rejected explicitly.

Safer integration#

Use a normal complete user request unless the exact deployed prefix contract is verified. For insertion into an existing document, genuine fill-in-the-middle requires separate suffix and known-answer tests; do not confuse the two features.