Definition
Model deprecation is the process of retiring older AI model snapshots from API availability, requiring developers to migrate to recommended replacements before a hard cutoff date.
Anthropic June 2026 Hard Cutoff
On June 15, 2026, requests to claude-sonnet-4-20250514 and claude-opus-4-20250514 fail immediately — no grace period, no gradual wind-down (2026-06-12-anthropic-claude-api-june-15-deprecation).
Migration Audit Locations
- Application code (SDK model strings)
- Environment variables
- ci-cd pipelines and GitHub Actions
- Docker images and Kubernetes manifests
- Third-party agent frameworks and model gateways
Opus 4.7+ Parameter Deprecation
sampling parameters (temperature, top_p, top_k) deprecated on Opus 4.7+ including claude-opus-4-8 — return 400 when non-default.