Claude API Deprecation: What Developers Need to Know Before June 15
With three days until Anthropic retires Claude Sonnet 4 and Opus 4 API snapshots, developers should treat this as a production incident prevention exercise.
No Grace Period
Anthropic’s documentation is explicit: after June 15, 2026, API calls to claude-sonnet-4-20250514 and claude-opus-4-20250514 return errors. There is no gradual wind-down or fallback routing.
Where Model IDs Hide
Common locations for hardcoded model strings:
- Python/TypeScript SDK initialization (
model="claude-sonnet-4-20250514") - Environment variables (
ANTHROPIC_MODEL,CLAUDE_MODEL) - Docker Compose and Kubernetes ConfigMaps
- GitHub Actions workflow YAML
- Terraform/IaC templates provisioning AI endpoints
- Third-party observability dashboards filtering by model ID
Recommended Replacements
| Deprecated | Active Replacement |
|---|---|
claude-sonnet-4-20250514 | claude-sonnet-4-6 |
claude-opus-4-20250514 | claude-opus-4-8 |
claude-opus-4-1-20250805 | claude-opus-4-8 (by Aug 5) |
Opus 4.7+ Sampling Change
Remove temperature, top_p, and top_k from Opus 4.7+ requests. The API returns HTTP 400 if these are set. Use system prompts and few-shot examples for behavioral control instead.
Verification Steps
grep -r "claude-sonnet-4-20250514\|claude-opus-4-20250514" .- Run integration tests against replacement models
- Check Claude Console Usage export for unexpected model strings
- Update documentation and runbooks before June 15