Model and API retirements

Within 30 days64Firm dates ahead558

64 within 30 days · 558 firm dates ahead

claude-3-sonnet-20240229 retirement date and replacement

Claude API · Model · retired Jul 21, 2025 (retired)

Vendor page

Dates

Checked Nov 9, 2026 on Anthropic's page
RetiredJul 21, 2025 (retired)
AnnouncedJan 21, 2025
Replacementclaude-sonnet-5-5
What it isclaude-3-sonnet-20240229 stopped answering on Claude API.
Sourceplatform.claude.com/docs/en/about-claude/model-deprecations

Changes

ReplacementUnverified

Anthropic changed the replacement for claude-3-sonnet-20240229 from claude-sonnet-4-6 to claude-sonnet-5-5.

Oct 10Source

Around the same time on Claude API

Anthropic
Claude APIModel

claude-2.0

Stopped answering on Claude API.

retiredJul 21, 2025
Claude APIModel

claude-2.1

Stopped answering on Claude API.

retiredJul 21, 2025