Anthropic — AI Safety Level: ASL-3 (Opus 4+), ASL-2 (Sonnet/Haiku)

Note: The source directly confirms that Anthropic activated ASL-3 protections for Claude Opus 4 as of May 22, 2025, and explicitly states that Claude Sonnet 4 does not require ASL-3 (implying it remains at ASL-2). The source also confirms the precautionary/provisional nature of the ASL-3 activation. The claim's date (2025-05) matches the source publication date. The only minor gap is that the source doesn't explicitly state Haiku's ASL level, but it does confirm the Opus 4 and Sonnet tier assignments claimed.

Note: The source directly confirms the claim's core assertions: (1) Claude Opus 4 is deployed with ASL-3 protections as of May 22, 2025, (2) this activation is explicitly described as 'precautionary and provisional', (3) Sonnet (Sonnet 4 specifically mentioned) does not require ASL-3 and remains at ASL-2 baseline, and (4) Haiku is not mentioned but the source confirms Sonnet does not meet ASL-3 threshold. The date matches the claimed 2025-05 timeframe. The only minor gap is that the source doesn't explicitly mention Haiku's ASL level, but it does confirm Sonnet's ASL-2 status and Opus 4's ASL-3 status with the precautionary/provisional qualifier as claimed.