Claude (Anthropic) claude-sonnet-4-5-20250929 · Version Status
Claude (Anthropic) claude-sonnet-4-5-20250929 End of Life Date
Claude (Anthropic) claude-sonnet-4-5-20250929 end-of-life date, support status, and CVE risk. Data from endoflife.date and official vendor documentation.
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Claude (Anthropic) claude-sonnet-4-5-20250929 reaches end of life on September 29, 2026. Plan your migration now — 98 days remaining.
📅 Get reminded before Claude (Anthropic) claude-sonnet-4-5-20250929 reaches EOL on September 29, 2026 — alerts 90, 30 & 7 days out.
EOL Date
Sep 29, 2026
98 days remaining
Latest Release
—
Standard release
Release Date
Sep 29, 2025
Claude (Anthropic) claude-sonnet-4-5-20250929 series
Attack Surface
20/30 High tier
CISA KEV Exposure
0/20 Not in KEV
Extended Support
10/10 None available
EOL Risk Score™ — proprietary methodology by endoflife.ai. Factors: EOL recency, attack surface breadth, CISA KEV catalog presence, extended support availability. Updated at every build.
Methodology → ·
View score card →
All Claude (Anthropic) Versions
What does Claude (Anthropic) claude-sonnet-4-5-20250929 end of life mean?
When Claude (Anthropic) claude-sonnet-4-5-20250929 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-4-5-20250929 past its EOL date creates a permanently growing attack surface that standard security tooling will not surface.
Migrate to Claude (Anthropic) claude-opus-4-8 or implement compensating controls — network segmentation, enhanced monitoring, restricted access — while migration is underway.
Frequently Asked Questions
When does Claude (Anthropic) claude-sonnet-4-5-20250929 reach end of life?
Claude (Anthropic) claude-sonnet-4-5-20250929 reached end of life on September 29, 2026. That is 98 days remaining.
Is Claude (Anthropic) claude-sonnet-4-5-20250929 still supported?
Claude (Anthropic) claude-sonnet-4-5-20250929 is still supported but approaching end of life on September 29, 2026. Begin planning your migration now.
What should I upgrade to from Claude (Anthropic) claude-sonnet-4-5-20250929?
The recommended upgrade from Claude (Anthropic) claude-sonnet-4-5-20250929 is
Claude (Anthropic) claude-opus-4-8 — the latest actively supported version. Check the
Claude (Anthropic) full timeline for all supported versions.
What are the security risks of running Claude (Anthropic) claude-sonnet-4-5-20250929 past EOL?
When Claude (Anthropic) claude-sonnet-4-5-20250929 reaches end of life, the maintainers stop issuing security patches. Any CVEs disclosed after the EOL date accumulate with no remediation path. Most vulnerability scanners do not flag this — it is the CVE blind spot. Organizations running EOL Claude (Anthropic) should migrate immediately or implement compensating controls.