Vigia

Anthropic Claude claude-sonnet-4-5-20250929 end of life (EOL) date and support status

Security fixes only Receives fixes until 2026-11-30 (in 53 days)

Anthropic Claude claude-sonnet-4-5-20250929 only receives security fixes until 2026-11-30; plan an upgrade to claude-sonnet-5-5.

ProductAnthropic Claude
Version cycleclaude-sonnet-4-5-20250929
StatusSecurity fixes only
Released2025-09-29
Active support until2026-09-30
End of life2026-11-30
Latest version—
Last verified2026-10-08

All Anthropic Claude versions → · Source: endoflife.date

Frequently asked questions

Is Anthropic Claude claude-sonnet-4-5-20250929 end of life?

Not yet, but active support has ended: Anthropic Claude claude-sonnet-4-5-20250929 only receives security fixes until 2026-11-30.

When does Anthropic Claude claude-sonnet-4-5-20250929 reach end of life?

Anthropic Claude claude-sonnet-4-5-20250929 reaches end of life on 2026-11-30.

When was Anthropic Claude claude-sonnet-4-5-20250929 released?

Anthropic Claude claude-sonnet-4-5-20250929 was first released on 2025-09-29.

Give your AI agent these facts

Vigia is a free MCP server: your coding agent checks versions, breaking changes and vulnerabilities before it writes code. No signup, no API key.

claude mcp add --transport http vigia https://vigia.coredls.cloud/mcp

Add to CursorAdd to VS Code★ Star on GitHub

Any other MCP client
{ "mcpServers": { "vigia": { "url": "https://vigia.coredls.cloud/mcp" } } }

Agent skill (SKILL.md): tells the agent when to use Vigia · GitHub Action for pull requests

For agents

GET https://vigia.coredls.cloud/v1/eol/claude/claude-sonnet-4-5-20250929