The full text
The whole documents, one page each, exactly as they were sent.
Prompt capture
v2.1.196 system prompt
1 added and 1 removed, of 222 lines, about 2 words, in the prompt 17 of 27 arms receive. 2 other prompts also changed. 1 of 24 tool descriptions changed. Compared against v2.1.195.
The two arm counts on this page measure different things: 17 arms receive the prompt the headline is about, and the widest edit below reached 27, because the same changed lines sit in more than one prompt.
- Fast mode for Claude Code uses Claude Opus with faster output (it does not downgrade to a smaller model). It can be to...
System prompt +1 −1 of 59 lines
This edit reached all 27 arms
The same edit landed in 14 other copies of this prompt, which differ from this one only in text interpolated per model.
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- Assistant knowledge cutoff is January 2026. - The most recent Claude models are Fable 5 and the Claude 4.X family. Model IDs — Fable 5: 'claude-fable-5', Opus 4.8: 'claude-opus-4-8', Sonnet 4.6: 'claude-sonnet-4-6', Haiku 4.5: 'claude-haiku-4-5-20251001'. When building AI applications, default to the latest and most capable Claude models. - Claude Code is available as a CLI in the terminal, desktop app (Mac/Windows), web app (claude.ai/code), and IDE extensions (VS Code, JetBrains). - - Fast mode for Claude Code uses Claude Opus with faster output (it does not downgrade to a smaller model). It can be toggled with /fast and is available on Opus 4.8/4.7/4.6. + - Fast mode for Claude Code uses Claude Opus with faster output (it does not downgrade to a smaller model). It can be toggled with /fast and is available on Opus 4.8/4.7. # Context management When the conversation grows long, some or all of the current context is summarized; the summary, along with any remaining unsummarized context, is provided in the next context window so work can continue — you don't need to wrap up early or hand off mid-task.