System Card: Claude Sonnet 4.5
As dated September 2025 on its cover. The cover states 'September 2025'; no day of the month is given, so the date keeps month precision.
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- Anthropic
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- Dates
- Published 2025-09 issue evidence
The cover states 'September 2025'; no day of the month is given, so the date keeps month precision.
- Exact source
- System Card: Claude Sonnet 4.5 Anthropic · publication date unknown · Retrieved for the candidate pack on 2026-10-28 (SHA-256 d5d1ce28fea101ae3b201a5d4da100090a5d6b73246f7da820cafd7dbb11100e). PDF whose cover reads 'System Card: Claude Sonnet 4.5, September 2025', as served on 2026-10-28; the request redirected to https://www-cdn.anthropic.com/963373e433e489a87a10c823c52a0a013e9172dd.pdf. No day of the month is stated. Retrieved again at admission on 2026-10-30 (SHA-256 d5d1ce28fea101ae3b201a5d4da100090a5d6b73246f7da820cafd7dbb11100e, the same bytes).
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anthropic-claude-system-card: 1 recorded version, oldest first, published by Anthropic. A version is shown as replacing another only where a record says so. Date order alone never implies it.
- 2025-09 · publishedAs dated September 2025 on its cover (this version)
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