Claude (Anthropic) Claude Sonnet 4.6 End of Life Date
Claude (Anthropic) Claude Sonnet 4.6 end-of-life date, support status, and CVE risk. Data from endoflife.date and official vendor documentation.
Claude (Anthropic) claude-sonnet-4-6 was released on February 17, 2026 and support is scheduled to end on February 17, 2027 — a planned supported lifespan of 1 year, in line with the 1 year and 1 month median for Claude (Anthropic) releases.
| Version | Latest | EOL Date | Status |
|---|---|---|---|
| Claude 1.0 | — | Nov 6, 2024 | EOL |
| Claude Instant 1.0 | — | Nov 6, 2024 | EOL |
| Claude 1.1 | — | Nov 6, 2024 | EOL |
| Claude 1.2 | — | Nov 6, 2024 | EOL |
| Claude Instant 1.1 | — | Nov 6, 2024 | EOL |
| Claude 1.3 | — | Nov 6, 2024 | EOL |
| Claude 2.0 | — | Jul 21, 2025 | EOL |
| Claude Instant 1.2 | — | Nov 6, 2024 | EOL |
What does Claude (Anthropic) Claude Sonnet 4.6 end of life mean?
When Claude (Anthropic) Claude Sonnet 4.6 reaches end of life, the maintainers stop issuing security patches for this version. CVEs discovered after the EOL date are publicly disclosed on the National Vulnerability Database with no patch available. Exploit code frequently appears on GitHub within days of disclosure.
The CVE blind spot: Most vulnerability scanners check for known CVEs but do not flag the ongoing accumulation of unpatched vulnerabilities in EOL software versions. Running Claude (Anthropic) Claude Sonnet 4.6 past its EOL date creates a permanently growing attack surface that standard security tooling will not surface.
Migrate to Claude (Anthropic) Claude Opus 5 or implement compensating controls — network segmentation, enhanced monitoring, restricted access — while migration is underway.