What the official prompt archive is
The official system-prompt release-notes page covers Claude web and mobile app prompt updates. It says the prompt supplies information such as the current date and nudges certain behavior such as Markdown code snippets. It also says updates are periodic and do not apply to the API.
That means the page is a source for the product prompt record, not a universal statement about every Claude runtime, every Claude Code tool wrapper, or every partner deployment.
Published prompt entries
| Model group | Published prompt dates visible in docs |
|---|---|
| Claude Fable 5 | June 9, 2026 |
| Claude Opus 4.8 | May 28, 2026 |
| Claude Opus 4.7 | April 16, 2026 |
| Claude Sonnet 4.6 | February 17, 2026 |
| Claude Opus 4.6 | February 5, 2026 |
| Claude Opus 4.5 | November 24, 2025; January 18, 2026 |
| Claude Haiku 4.5 | October 15, 2025; November 19, 2025; January 18, 2026 |
| Claude Sonnet 4.5 | September 29, 2025; November 19, 2025; January 18, 2026 |
| Claude Sonnet 3.5 | July 12, 2024; September 9, 2024; October 22, 2024; November 22, 2024 |
What this table is verified through
The dated entries above were read from the official system-prompt release notes during the July 6, 2026 source pass and cover models up to Claude Fable 5. The September 19, 2026 pass updated the model, pricing, and deprecation records on this site but did not re-read the system-prompt page, so no entries are claimed here for Claude Opus 5 or Claude Fable 5.1.
The archive would rather show a dated gap than guess. Check the official system-prompt release notes directly for anything published after June 2026.
Why prompt history matters
Published prompts are behavioral artifacts. They show how Anthropic describes product capabilities, safety posture, available tools, and response style at a point in time. For researchers, those dates are useful even when the model weights are unavailable.
The prompt archive also helps avoid overclaiming. If a change is recorded as a Claude web or mobile app system-prompt change, do not cite it as an API behavior change unless the API docs independently say so.
What this page excludes
Claude Archive does not treat prompt-leak repositories as primary sources. It also does not reproduce full prompt text. The archival value here is the official publication trail, the dated model entries, and the scope caveats that keep downstream claims accurate.
Questions this page answers
Does the official Claude system-prompt page apply to the API?
No. The official page says those system-prompt updates do not apply to the Claude API.
When do the earliest visible official system-prompt entries start?
The current official page lists July 12, 2024 entries for Claude Sonnet 3.5, Opus 3, and Haiku 3.
Does Claude Archive publish leaked prompts?
No. Claude Archive cites Anthropic-published prompt release notes and avoids leaked or unofficial prompt repositories.
Are Claude Opus 5 and Claude Fable 5.1 system prompts listed here?
No. The prompt table on this page is verified through the July 6, 2026 source pass, which covers models up to Claude Fable 5. Check the official system-prompt release notes for later entries.