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Simple Prompt Switch on Sonnet

CLAUDE_CODE_SIMPLE_SYSTEM_PROMPT=1 on Sonnet 5.5. Set CLAUDE_CODE_SIMPLE_SYSTEM_PROMPT=1 and use --model claude-sonnet-5-5.

Size​

PartCharacters
system[0]78
system[1]62
system[2]5,627
messages[0].content[0]594
messages[0].content[1]2
messages[1].content[0]8,854
System blocks only5,767
Everything shown here15,507
Tools sent12

Sizes count the text after the placeholders are in place. Each placeholder counts at its own length.

What to Notice​

  • The text and tools are the same as the default on Sonnet 5.5. In this release the "short" prompt is already what Sonnet gets.

Full Text​

This variant sends exactly the same text and tools as Default, Sonnet 5.5. The page for that variant has the full text.

Compared to the Default​

The diff below starts from Default, Sonnet 5.5. Lines that start with - are only in the baseline. Lines that start with + are only here.

There are no differences in the text.

The tool list is the same as the baseline.