Is Claude 4 deprecated?

Yes. Claude 4 Opus and Claude Sonnet 4 were deprecated and were retired on June 15, 2026. API calls to these model IDs now return errors. The recommended replacements are Claude Opus 4.8 and Claude Sonnet 4.6.

When did Claude 4 stop working?

Claude 4 Opus and Claude Sonnet 4 stopped working on June 15, 2026. After this date, API calls to 'claude-4-opus' and 'claude-sonnet-4' return errors.

What should I replace Claude 4 with?

The easiest replacement is Claude Opus 4.8 (67% cheaper at $5/$25 vs $15/$75) or Claude Sonnet 4.6 (same price, better context). For cross-provider alternatives, GPT-5 ($1.25/$10) and DeepSeek V4 Pro ($0.435/$0.87) are strong options.

How much does it cost to migrate from Claude 4?

Migration is free — it's just a model name string change in your code. In fact, you'll likely save money: Claude Opus 4.8 is 67% cheaper than Claude 4 Opus, and Claude Sonnet 4.6 is the same price with better performance.

Claude 4 Deprecated: 10-Day Countdown — What You Need to Know

Want to optimize your AI API costs?

APIpulse includes free cost comparisons, exports, and recommendations that can save you up to 40%.

Free Cost Audit →

💸 Looking for Sonnet 4.6 Alternatives?

5 models ranked by cost — some are 90% cheaper.

See 5 Sonnet 4.6 Alternatives →

💸 Looking for Opus 4.8 Alternatives?

5 models ranked by cost — some are 98% cheaper.

See 5 Opus 4.8 Alternatives →

🔧 Free Embeddable Pricing Widget

Add live AI API pricing to your docs, blog, or README with one script tag. 82 models, auto-updating.

Get the Free Widget → Free MCP Server →