| claude-1 | Claude 1 | Mar 2023 | Initial Claude model release |
| claude-2 | Claude 2 | Jul 2023 | Major capability upgrade |
| claude-3-5-sonnet | Claude 3.5 Sonnet | Jun 2024 | Outperformed larger Opus model; launched with Artifacts feature |
| claude-3-5-sonnet-v2 | Claude 3.5 Sonnet v2 + 3.5 Haiku | Oct 2024 | Updated Sonnet with Computer Use beta; new Haiku model |
| claude-4 | Claude 4 (Opus 4, Sonnet 4) | May 2025 | Opus 4 was first model under ASL-3; improved coding capabilities |
| claude-sonnet-4-5 | Claude Sonnet 4.5 | Sep 2025 | Mid-generation refresh |
| claude-haiku-4-5 | Claude Haiku 4.5 | Oct 2025 | Smallest model in 4.5 family |
| claude-opus-4-5 | Claude Opus 4.5 | Nov 2025 | 80.9% SWE-bench Verified — first model above 80%; 42% enterprise coding share |
| claude-opus-4-6 | Claude Opus 4.6 | Feb 2026 | Agent teams, PowerPoint generation; flagship model |
| claude-sonnet-4-6 | Claude Sonnet 4.6 | Feb 2026 | Same pricing as Sonnet 4.5; default for free and Pro users |