Claude 4 Is Deprecated — Here's What to Do
Claude 4 Opus and Claude Sonnet 4 were retired on June 15, 2026. If your code still uses these models, your API calls are failing. Here's how to fix it — and save 67-97% in the process.
⚠️ Claude 4 shut down June 15, 2026 — migrate now
Tools & Resources
Top Alternatives to Claude 4
Claude Opus 4.8
Anthropic
$5/$25
67% cheaper than Claude 4 Opus
Recommended
Gemini 3.1 Pro
Google
$2/$12
87% cheaper, 1M context
Best Value
GPT-5.5
OpenAI
$5/$30
73% cheaper on input
Premium
DeepSeek V4 Pro
DeepSeek
$0.66/$1.98
97% cheaper — lowest cost
Cheapest
Frequently Asked Questions
Will my Claude 4 API calls start working again?
No. Claude 4 Opus and Sonnet 4 are permanently retired. You need to update your model name to Claude Opus 4.8 or Claude Sonnet 4.6. The API format is identical — just change the model parameter.
Do I need to rewrite my prompts?
No. Claude Opus 4.8 and Sonnet 4.6 use the same API format, prompt structure, and system message format. Your existing code works with just a model name change.
What if I need the cheapest possible option?
DeepSeek V4 Flash ($0.22/$0.66) is 99% cheaper than Claude 4 Opus. Gemini 2.5 Flash-Lite ($0.10/$0.40) is even cheaper on input tokens. Use the Provider Switch Calculator to see exact costs for your usage.
Can I use multiple models for different tasks?
Yes — and you should. Use budget models (DeepSeek V4 Flash, Gemini Flash) for simple tasks like classification and summarization, and premium models (Claude Opus 4.8, GPT-5.5) for complex reasoning. The AI Stack Cost Optimizer helps you find the cheapest combination.
Need help choosing?
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