48-hour warning: Claude Sonnet 4 and Opus 4 API calls fail June 15 at 9 AM PT — search your codebase for 20250514 now

You have until Sunday 9 AM Pacific / 4 PM UTC on June 15 to update any code still referencing claude-sonnet-4-20250514 or claude-opus-4-20250514. After that cutoff, those model IDs return errors — not responses. No grace period, no soft deprecation; the switch flips and production breaks.

Who is affected. This is API-only. Anthropic's model deprecations page confirms that consumer Claude.ai, Claude Code in the terminal, and managed Claude Code environments are not affected — only direct API callers using pinned version identifiers.

How to find your exposure. Run a global search for the string 20250514. Every match is a migration target. Common locations: environment variables, config files, Terraform, CI YAML, Anthropic SDK instantiation calls, and any code passing a model ID to a third-party wrapper.

What to migrate to. Anthropic recommends:

• claude-sonnet-4-20250514 → claude-sonnet-4-6
• claude-opus-4-20250514 → claude-opus-4-8 (or claude-opus-4-7 for complex agentic workloads)

Prompting style, tool-use conventions, and JSON response formats are stable across the 4.x generation — this is a string swap in most cases. If you're at high traffic volume, use an environment variable or feature flag to canary-route a percentage of traffic to the new model ID before full cutover.

Sources: Anthropic model deprecations, MindStudio: migration guide, ChatForest: deprecation guide, EnterpriseDNA: two Claude deadlines June 15, APIpulse: countdown