Unverified50% confidenceFactExact time
In traditional interfaces such as OpenAI Chat Completions, messages with the system role are usually conventionally placed at the very front of the message array, as the global setting for the entire session.
1
Sources
50%
Confidence
Long-term
Relevance
10/12/2026
First Seen
Sources
Related Entities
Related Claims
UnverifiedIn the traditional Chat Completions paradigm, system messages are usually only allowed to appear at the beginning of the message list76% similarUnverifiedAnthropic's Messages API allows system content to be inserted at any position in the conversation.73% similarUnverifiedChat Model的输入是一个消息列表，输出是结构化消息对象AIMessage，对应ChatOpenAI、ChatAnthropic等类73% similarUnverifiedThe OpenAI Responses API introduces a session state persistence mechanism, allowing the server to save conversation context so that clients no longer need to include the full message history in every request, thereby reducing token consumption.72% similarUnverifiedIn API calls, the system prompt is passed in as a distinct message role (role: system), carries higher instruction priority than ordinary user messages, and persists throughout the entire conversation.71% similar
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