Promptcred Prompt intelligence

Official prompt history

Claude system prompt

Anthropic's January 18 Claude Opus 4.5 entry expands product context and makes the boundary around potentially changed product details more explicit.

Limited excerpt and analysis Claude Opus 4.5 · January 18, 2026

Publication context

Read the provenance first

The official prompt is publicly viewable; this route publishes one short excerpt plus original normalization and interpretation.

Source tier
Tier A · vendor-published
Confidence
high
Published
Jan 18, 2026
Completeness
partial
Checksum
sha256:a86dd6e26d096…
Raw artifact
Not publicly reproduced

Promptcred analysis

What the instruction record establishes

Interpretation stays within the selected artifact, mapped sections, and stated publication limits.

Behavioral implications

  • Unlisted product details are treated as potentially changed rather than answered as stable facts.
  • Product and API questions outside the supplied context are directed to Anthropic support or developer documentation.

Evidence: Knowledge and support routing, Response conventions

Scope and hierarchy

  • The record covers the January 18, 2026 Claude Opus 4.5 product-context entry and its named Claude surfaces.
  • The selected evidence shows product-information and knowledge boundaries but does not establish the full instruction hierarchy.

Evidence: Product information boundary, Knowledge and support routing

Tool and use implications

Not established. The selected dated entry does not establish a complete tool inventory or the rules governing tool execution.

Practical lessons for professional users

  • Attach product claims to the covered date and surface, then verify details that may have changed against current official documentation.
  • Keep conclusions tied to the dated product context and avoid extending them to unlisted Claude surfaces or later instruction states.

Evidence: Knowledge and support routing, Response conventions

What can and cannot safely be inferred

Supported by this record

  • The dated entry expands named Claude product surfaces and states a boundary around unlisted or potentially changed product details.

Outside this record

  • It does not establish the complete prompt, a full tool inventory, memory behavior, or the latest instruction state.

Evidence: Product information boundary, Knowledge and support routing, Response conventions

Official dated system-prompt publication

Official-source normalized map

The reader presents source-led semantic normalization; the selected January record also includes one short official excerpt. It does not mirror the full Anthropic publication.

01

Product information boundary

editorial normalization
Editorial normalization:
The January update keeps Claude Opus 4.5 identity and expands named product context to browser, spreadsheet, and desktop task surfaces alongside chat, API, and Claude Code.

Reading note. Anthropic marks the additional product context as changed in the official dated publication.

02

Knowledge and support routing

verbatim excerpt
Official limited excerpt:
“Claude does not know other details about Anthropic's products.”

Editorial normalization:
The update explicitly treats unlisted product details as potentially changed and routes users to official support or developer documentation.

Reading note. The short excerpt is presented with the broader source-led meaning and does not imply access to live product state.

03

Response conventions

source led map
Source-led map:
The official publication describes prompt-level response shaping, including current-date context and formatting expectations.

Reading note. This section records the function of the published system prompt without reproducing its full text.

Evidence and provenance

Tier A · vendor-published: Anthropic system-prompt release publication — Vendor-published prompt material supports a Tier A record; full-text republication is intentionally avoided.

Snapshot evidence

What this snapshot includes and leaves out.

Product surface
claude.ai and Claude apps
Model context
Claude Opus 4.5This record selects the model's two official dated entries to demonstrate compatible version history; it is not a claim about every Claude model.
Checksum scope
Three-section limited excerpt and editorial normalization of the official dated entry; UTF-8, LF line endings.
Raw mode
Use Anthropic's official dated publication for the full text. Promptcred retains limited excerpts, normalization, checksums, and change interpretation.

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