Is claude-3-sonnet-20240229 deprecated?

Q: Is claude-3-sonnet-20240229 deprecated?

Yes — deprecated. Retired 2025-07-21 — 377 days ago. Requests to this identifier are expected to fail. The provider names claude-sonnet-4-6 as the replacement.

DEPRECATED

Retired 2025-07-21 — 377 days ago. Requests to this identifier are expected to fail. The provider names claude-sonnet-4-6 as the replacement.

state=dead sunset=2025-07-21 days_remaining=-377 severity=critical sources=docs,litellm evidence_tier=documentation confirmed_by_endpoint=false documented_by_provider=docs replacement=claude-sonnet-4-6 corroborated=yes divergent_fields=none checked=2026-08-02 01:41Z

anthropic/claude-3-sonnet-20240229

Vendor: anthropic. Tracked by 2 of 5 sources.

What each source reports

**endpoint** = the provider's own machine-readable API, the strongest evidence. **provider docs** = the provider's own documentation, read by a model — first-party content, inferred reading. Unlabelled rows are third-party catalogs. Where sources disagree both values are shown rather than silently reconciled.
Source	ID	Context	Max out	In $/Mtok	Out $/Mtok	Sunset
docs	claude-3-sonnet-20240229	—	—	—	—	2025-07-21
litellm	anthropic.claude-3-sonnet-20240229-v1:0	200,000	4,096	$3	$15	—

Change history

Severity	Change	What	Detected
info	deprecated	claude-3-sonnet-20240229: retires 2025-07-21 (376 days ago)	2026-08-01
low	added	new model claude-3-sonnet-20240229	2026-08-01
medium	removed	[one catalog only — docs, litellm still list it] claude-3-sonnet-20240229 is no longer listed by this source — calls to it are expected to fail	2026-08-01