Anthropic Claude claude-sonnet-4-5-20250929 End of Life
Support dates and upgrade guidance — rebuilt from live data.
Anthropic Claude claude-sonnet-4-5-20250929 is actively supported. It reaches end of life on 29 Sept 2026.
Support timeline
Official dates from the Anthropic Claude release process.
| Milestone | Date | Status |
|---|---|---|
| Initial release | 29 Sept 2025 | — |
| End of life (scheduled) | 29 Sept 2026 | in 51 days |
| Latest release | — | current |
How much runway a newer branch buys
Moving to Anthropic Claude claude-opus-5 extends security support by about 298 days.
| Branch | End of life | Days left | vs claude-sonnet-4-5-20250929 |
|---|---|---|---|
| Anthropic Claude claude-opus-5 | 24 Jul 2027 | 349 | +298 days |
| Anthropic Claude claude-sonnet-5 | 30 Jun 2027 | 325 | +274 days |
| Anthropic Claude claude-fable-5 | 9 Jun 2027 | 304 | +253 days |
| Anthropic Claude claude-opus-4-8 | 28 May 2027 | 292 | +241 days |
| Anthropic Claude claude-opus-4-7 | 16 Apr 2027 | 250 | +199 days |
| Anthropic Claude claude-sonnet-4-6 | 17 Feb 2027 | 192 | +141 days |
| Anthropic Claude claude-opus-4-6 | 5 Feb 2027 | 180 | +129 days |
| Anthropic Claude claude-opus-4-5-20251101 | 24 Nov 2026 | 107 | +56 days |
| Anthropic Claude claude-haiku-4-5-20251001 | 15 Oct 2026 | 67 | +16 days |
| Anthropic Claude claude-sonnet-4-5-20250929 | 29 Sept 2026 | 51 | this branch |
Frequently asked questions
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 29 Sept 2026 — 51 days from now. After that date it receives no security fixes.
Is Anthropic Claude claude-sonnet-4-5-20250929 still supported?
Yes. Anthropic Claude claude-sonnet-4-5-20250929 is currently maintained. Latest release: —.
What happens when Anthropic Claude claude-sonnet-4-5-20250929 reaches end of life?
Security fixes stop. After 29 Sept 2026 this branch receives no further updates under standard support.
How long do I have to upgrade from Anthropic Claude claude-sonnet-4-5-20250929?
51 days. Moving to Anthropic Claude claude-opus-5 instead buys roughly 298 more days of security support.