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Claude Opus 5.5
Claude Opus 5.5 is an SI model from Anthropic. The Containment Board lists it as a flagship model of Anthropic, which gets B+ overall.
- Developer
- Anthropic
- Type
- SI model
- Rogue Log cases
- 0
- Lab grade
- B+
What the sources document
This entry only states what the sources on enterrsi.si document. Release dates, sizes and other specifications are left out unless a source here gives them.
- Claude Opus 5.5 was tested before release by US CAISSI (then named CAISI) for cyber, biological and unintended behavior risks, by METR for automated research risk, by Frontier Design, and by contracted red teamers, with METR's findings reproduced in the system card. Containment Board, outside testing
Grade context
The Containment Board grades labs, not single models. Anthropic gets B+ overall, rank 1 of 11, on the commitments that decide whether its models can be tested, contained and stopped. See the full report card.
- Safety frameworkB+
- Outside testingA-
- Shutdown and pauseB-
- Incident disclosureA
- Whistleblower protectionB+
Sources
- System Card: Claude Opus 5.5 Anthropic ·
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