system card · primary source
Claude Opus 5.5 System Card
Publisher: Anthropic · publication date: 2026-09-22 (day)
Original document
- Canonical URL
- https://www.anthropic.com/claude-opus-5-5-system-card ↗
- Publication date
- 2026-09-22 (day)
- Last updated
- Not reported
- Access status
- available
- Retrieved
- 2026-09-26T04:47:27Z
Tracker records citing this source
| Record type | Record | Locator |
|---|---|---|
| Evidence | co21-opus5 | §2.3.4.1, printed pp.36–37; PDF indices 35–36; Figure 2.3.4.1.A |
| Evidence | co21-mythos51 | §2.3.4.1, printed pp.36–37; PDF indices 35–36; Figure 2.3.4.1.A |
| Evidence | co21-opus55 | §2.3.4.1, printed pp.36–37; PDF indices 35–36; Figure 2.3.4.1.A |
| Evidence | co-prior-opus5 | §2.3.4.1, printed pp.36–37; PDF indices 35–36; Figure 2.3.4.1.A |
| Evidence | co-prior-mythos51 | §2.3.4.1, printed pp.36–37; PDF indices 35–36; Figure 2.3.4.1.A |
| Benchmark | CoBench | §2.3.4.1, Figure 2.3.4.1.A; printed pp.36–37, PDF indices 35–36 |
| Paper / report | Claude Opus 5.5 System Card | Primary publication source |
Availability checks
- 2026-09-26T04:47:27Z · success: Original source inspected by Codex; extraction check, not experimental replication.