Claude (Anthropic) Claude Opus 4.5 · Version Status
Claude (Anthropic) Claude Opus 4.5 End of Life Date
Claude (Anthropic) Claude Opus 4.5 end-of-life date, support status, and CVE risk. Data reconciled from official vendor documentation and endoflife.date at every build; the source of each date is on the product page.
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Claude (Anthropic) Claude Opus 4.5 reaches end of life on November 24, 2026. Plan your migration now — 62 days remaining.
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EOL Date
Nov 24, 2026
62 days remaining
Latest Release
—
Standard release
Release Date
Nov 24, 2025
Claude (Anthropic) Claude Opus 4.5 series
Lifecycle detail
Claude (Anthropic) claude-opus-4-5-20251101 was released on November 24, 2025 and support is scheduled to end on November 24, 2026 — a planned supported lifespan of 1 year, in line with the 1 year and 1 month median for Claude (Anthropic) releases.
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 Opus 4.5 end of life mean?
When Claude (Anthropic) Claude Opus 4.5 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: A CVE-based scan does not show the ongoing accumulation of unpatched vulnerabilities in EOL software versions. Some scanners flag unsupported versions of common products, but coverage varies, and none of them give you the date in advance. Running Claude (Anthropic) Claude Opus 4.5 past its EOL date creates a growing attack surface that a clean scan result does not rule out.
Migrate to Claude (Anthropic) Claude Mythos 5.1 or implement compensating controls — network segmentation, enhanced monitoring, restricted access — while migration is underway.
Frequently Asked Questions
When does Claude (Anthropic) Claude Opus 4.5 reach end of life?
Claude (Anthropic) Claude Opus 4.5 reached end of life on November 24, 2026. That is 62 days remaining.
Is Claude (Anthropic) Claude Opus 4.5 still supported?
Claude (Anthropic) Claude Opus 4.5 is still supported but approaching end of life on November 24, 2026. Begin planning your migration now.
What should I upgrade to from Claude (Anthropic) Claude Opus 4.5?
The recommended upgrade from Claude (Anthropic) Claude Opus 4.5 is
Claude (Anthropic) Claude Mythos 5.1 — 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 Opus 4.5 past EOL?
When Claude (Anthropic) Claude Opus 4.5 reaches end of life, the maintainers stop issuing security patches. Any CVEs disclosed after the EOL date accumulate with no vendor fix. A CVE-based scan does not show this — it is the CVE blind spot; some scanners flag unsupported versions of common products, but coverage varies and none give the date in advance. Organizations running EOL Claude (Anthropic) should migrate immediately or implement compensating controls.