Anthropic Claude claude-sonnet-5-5 End of Life
Support dates and upgrade guidance — rebuilt from live data.
Supported
Anthropic Claude claude-sonnet-5-5 is actively supported. It reaches end of life on 28 Sept 2027.
358 days of security support left
2% of this branch's supported lifetime has elapsed — 28 Sept 2026 → 28 Sept 2027.
Support timeline
Official dates from the Anthropic Claude release process.
| Milestone | Date | Status |
|---|---|---|
| Initial release | 28 Sept 2026 | this month |
| Deprecated support ends | 28 Sept 2027 | in 1y |
| Latest release | — | current |
How much runway a newer branch buys
Anthropic Claude claude-sonnet-5-5 is the newest branch — this is the longest runway currently available.
| Branch | End of life | Days left | vs claude-sonnet-5-5 |
|---|---|---|---|
| Anthropic Claude claude-sonnet-5-5 | 28 Sept 2027 | 358 | this branch |
| Anthropic Claude claude-opus-5-5 | 22 Sept 2027 | 352 | -6 days |
| Anthropic Claude claude-mythos-5-1 | 1 Sept 2027 | 331 | -27 days |
| Anthropic Claude claude-fable-5-1 | 1 Sept 2027 | 331 | -27 days |
| Anthropic Claude claude-opus-5 | 24 Jul 2027 | 292 | -66 days |
| Anthropic Claude claude-sonnet-5 | 30 Jun 2027 | 268 | -90 days |
| Anthropic Claude claude-mythos-5 | 9 Jun 2027 | 247 | -111 days |
| Anthropic Claude claude-fable-5 | 9 Jun 2027 | 247 | -111 days |
| Anthropic Claude claude-opus-4-8 | 28 May 2027 | 235 | -123 days |
| Anthropic Claude claude-opus-4-7 | 16 Apr 2027 | 193 | -165 days |
| Anthropic Claude claude-sonnet-4-6 | 17 Feb 2027 | 135 | -223 days |
| Anthropic Claude claude-opus-4-6 | 5 Feb 2027 | 123 | -235 days |
| Anthropic Claude claude-opus-4-5-20251101 | 24 Nov 2026 | 50 | -308 days |
| Anthropic Claude claude-haiku-4-5-20251001 | 15 Oct 2026 | 10 | -348 days |
| Anthropic Claude claude-sonnet-4-5-20250929 | 30 Nov 2026 | 56 | -302 days |
Frequently asked questions
When does Anthropic Claude claude-sonnet-5-5 reach end of life?
Anthropic Claude claude-sonnet-5-5 reaches end of life on 28 Sept 2027 — 358 days from now. After that date it receives no security fixes.
Is Anthropic Claude claude-sonnet-5-5 still supported?
Yes. Anthropic Claude claude-sonnet-5-5 is currently maintained. Latest release: —.
What happens when Anthropic Claude claude-sonnet-5-5 reaches end of life?
Security fixes stop. After 28 Sept 2027 this branch receives no further updates under standard support.
How long do I have to upgrade from Anthropic Claude claude-sonnet-5-5?
358 days. This is already the newest branch, so this is the longest runway currently available.
All Anthropic Claude versions
claude-sonnet-5-5 supported claude-opus-5-5 supported claude-mythos-5-1 supported claude-fable-5-1 supported claude-opus-5 supported claude-sonnet-5 supported claude-mythos-5 supported claude-fable-5 supported claude-opus-4-8 supported claude-opus-4-7 supported claude-sonnet-4-6 supported claude-opus-4-6 supported claude-opus-4-5-20251101 supported claude-haiku-4-5-20251001 supported claude-sonnet-4-5-20250929 supported claude-opus-4-1-20250805 EOL 2026 claude-sonnet-4-20250514 EOL 2026 claude-opus-4-20250514 EOL 2026 claude-3-7-sonnet-20250219 EOL 2026 claude-3-5-haiku-20241022 EOL 2026 claude-3-5-sonnet-20241022 EOL 2025 claude-3-5-sonnet-20240620 EOL 2025 claude-3-haiku-20240307 EOL 2026 claude-3-opus-20240229 EOL 2026 claude-3-sonnet-20240229 EOL 2025 claude-2.1 EOL 2025 claude-instant-1.2 EOL 2024 claude-2.0 EOL 2025 claude-1.3 EOL 2024 claude-instant-1.1 EOL 2024 claude-1.2 EOL 2024 claude-1.1 EOL 2024 claude-instant-1.0 EOL 2024 claude-1.0 EOL 2024