Claude 4 generation is legacy
The Claude 4 family (May 2025 to May 2026) has been superseded by Claude 5 (Fable 5.1, Opus 5.5, Sonnet 5.5). Retired: Opus 4 and Sonnet 4 (2026-06-15), Opus 4.1 (2026-08-05). Still served (legacy): Opus 4.5/4.6/4.7/4.8, Sonnet 4.6; Sonnet 4.5 is deprecated (retires 2026-11-30). Haiku 4.5 remains the current Haiku. See anthropic-claude.
Anthropic Claude 4 model series releases
- Haiku 4.5 (2025-10-15; current Haiku)
- Opus 4.5 (2025-11-24)
- Sonnet 4.5 (2025-09-29; deprecated)
- Sonnet 4.6 (2026-02-17)
- Opus 4.6 (2026-02-05)
- claude-opus-4-dot-7 (2026-04-16)
- claude-opus-4-dot-8 (2026-05-28)
- Opus 4.1 (retired)
- Opus 4 (retired)
- Sonnet 4 (retired)
The earlier Opus 4.7 section (launch-period commentary, benchmark comparisons and unconfirmed leaks from April 2026) was removed as outdated; see claude-opus-4-dot-7.
Sources
- https://platform.claude.com/docs/en/about-claude/model-deprecations (accessed 2026-09-30)
- https://platform.claude.com/docs/en/about-claude/models/overview (accessed 2026-09-30)