Question 1

What is the EOL Risk Score for Claude (Anthropic) Claude Sonnet 4?

Accepted Answer

Claude (Anthropic) Claude Sonnet 4 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 Sonnet 4 still supported?

Accepted Answer

Claude (Anthropic) Claude Sonnet 4 is no longer supported — it has passed its end of life date (June 15, 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 Sonnet 4 reach end of life?

Accepted Answer

Claude (Anthropic) Claude Sonnet 4 reached (or will reach) end of life on June 15, 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 Sonnet 4 after end of life?

Accepted Answer

After end of life, Claude (Anthropic) Claude Sonnet 4 no longer receives security patches. Any newly discovered CVEs remain unpatched indefinitely. Organizations running EOL software also face compliance violations under SOC 2, PCI DSS, HIPAA, and ISO 27001, which require use of supported software versions.