Replace model names
claude-4-opus → claude-opus-4-8 and claude-sonnet-4 → claude-sonnet-4-6.
Check config files and .env
Update any environment variables or config files that reference the old model names.
Update database records
If model names are stored in a database, run the UPDATE queries above.
Test and deploy
Test with a single API call, then deploy. No infrastructure changes needed.
Calculate your savings
While you're at it, see if a cheaper model fits your use case. Use our calculator →
June 15 deadline: See all 67 alternatives, calculate your savings, and get migration code on our Claude 4 Migration Hub.
Related Resources
- 🚨 Claude 4 Is Down — 5-Minute Fix Guide
- Claude Deprecation Calculator — Calculate your exact migration cost and savings
- Claude 4 Migration Tool — Compare all 67 alternatives with your exact usage
- Claude 4 API Errors — Every error code and how to fix it
- Claude 4 Deprecation Checklist — Complete 8-step migration checklist
- Claude 4 Migration Guide — Detailed code examples in Python, Node.js, and REST
- Claude 4 Deprecation FAQ — Every question answered about the deprecation
- Best Claude 4 Alternatives — Detailed comparison of all replacement options
- Claude 4 Retired — What to Do Now — Post-deprecation guide with 98% cheaper alternatives
Don't just fix the error — optimize your costs
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