Controlling model output

Influencing Claude Output: Advanced Techniques

**I. Pre-filling Assistant Messages**

• Purpose: To strongly steer or direct Claude's response toward a specific viewpoint or direction.
• Method: Manually include an "assistant message" within the message list you send to the model.
• Mechanism: Claude interprets this pre-filled message as content that has already been authored. It uses this text as a starting point and continues generating its response from the very end of the pre-filled text.
• Key Consideration: The pre-filled text is generally not a complete sentence. The user must manually combine (stitch) the pre-filled text with the partial response generated by Claude to form a coherent final output.

**II. Stop Sequences**

• Purpose: To force Claude to terminate response generation immediately upon encountering a specific string.
• Method: Provide one or more specific strings (stop sequences) as an optional parameter in the function call (e. g. , stop_sequences).
• Mechanism: When Claude generates any of the specified sequences, the generation process halts instantly, and the output generated up to that point is returned.
• Application: Stop sequences can be individual characters or full words, allowing for precise truncation of the model's output.

Takeaways

• Pre-filling Assistant Messages steers Claude by providing pre-authored text that the model continues generating from.
• The pre-filled text often requires manual stitching to ensure the final output is coherent.
• Stop Sequences force Claude to terminate response generation immediately upon encountering a specific string.
• Stop sequences allow for precise output truncation, ranging from single characters to full words.