Question 1

What is the EOL Risk Score for Claude (Anthropic) Claude Opus 4.1?

Accepted Answer

Claude (Anthropic) Claude Opus 4.1 has an EOL Risk Score™ of 60 out of 100, placing it in the High risk band. The score is calculated from four factors: EOL Recency (30/40), Attack Surface (20/30), CISA KEV Exposure (0/20), and Extended Support Availability (10/10).

Question 2

Is Claude (Anthropic) Claude Opus 4.1 still supported?

Accepted Answer

Claude (Anthropic) Claude Opus 4.1 is no longer supported — it has passed its end of life date (August 5, 2026). No further security patches will be issued. Upgrade to a supported version or obtain extended lifecycle support.

Question 3

When does Claude (Anthropic) Claude Opus 4.1 reach end of life?

Accepted Answer

Claude (Anthropic) Claude Opus 4.1 reached (or will reach) end of life on August 5, 2026. After this date, no security patches or bug fixes are issued by the vendor.

Question 4

What are the security risks of running Claude (Anthropic) Claude Opus 4.1 after end of life?

Accepted Answer

After end of life, the vendor's standard support for Claude (Anthropic) Claude Opus 4.1 ends, so newly discovered vulnerabilities may never be fixed unless a paid extended support option covers that version. Auditors ask about it too: PCI DSS requirement 12.3.4, for example, calls for a yearly review of vendor end-of-life announcements with a remediation plan approved by senior management.