Question 1

What is the EOL Risk Score for Claude (Anthropic) Claude Sonnet 3.5 (20241022)?

Accepted Answer

Claude (Anthropic) Claude Sonnet 3.5 (20241022) has an EOL Risk Score™ of 65 out of 100, placing it in the High risk band. The score is calculated from four factors: EOL Recency (35/40), Attack Surface (20/30), CISA KEV Exposure (0/20), and Extended Support Availability (10/10).

Question 2

Is Claude (Anthropic) Claude Sonnet 3.5 (20241022) still supported?

Accepted Answer

Claude (Anthropic) Claude Sonnet 3.5 (20241022) is no longer supported — it has passed its end of life date (October 28, 2025). No further security patches will be issued. Upgrade to a supported version or obtain extended lifecycle support.

Question 3

When does Claude (Anthropic) Claude Sonnet 3.5 (20241022) reach end of life?

Accepted Answer

Claude (Anthropic) Claude Sonnet 3.5 (20241022) reached (or will reach) end of life on October 28, 2025. 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 Sonnet 3.5 (20241022) after end of life?

Accepted Answer

After end of life, the vendor's standard support for Claude (Anthropic) Claude Sonnet 3.5 (20241022) 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.