How to Find Deprecated Claude 4 Code in 10 Seconds
Claude 4 Opus and Sonnet 4 were retired on June 15, 2026. If your code still references claude-4-opus or claude-sonnet-4, your API calls are returning HTTP 410 errors right now.
The fix is simple — update your model IDs. But finding every reference across a large codebase? That's the tedious part.
We built a free tool that does it in seconds.
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Generate My Report →🔍 Try the Migration Scanner — It's Free
Paste your code, find every deprecated Claude 4 reference, see exact line numbers. No signup, no upload, runs entirely in your browser.
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The Problem: Finding Deprecated Code by Hand
When Claude 4 was retired, developers scrambled to find every reference across their projects. The common approach:
❌ The Manual Way
- Search for "claude-4-opus" — find 3 hits
- Search for "claude-sonnet-4" — find 7 more
- Search for "claude-4-opus-20250615" — miss this one entirely
- Check config files, environment variables, Docker compose files
- Remember to check LangChain configs, LlamaIndex settings, Vercel env vars...
- Miss one reference, debug 410 errors for 2 hours
This takes 15-30 minutes for a small project. For a monorepo with multiple services? Hours.
The Solution: Automated Scanning
✅ The Scanner Way
- Paste your code (or upload a file)
- Scanner finds all 8 deprecated patterns in under a second
- Shows exact line numbers and surrounding context
- Auto-detects your framework (Python SDK, Node.js, LangChain, etc.)
- Shows what needs to change (free) and exact replacement code (Pro)
What the Scanner Detects
The scanner checks for 8 deprecated Claude 4 patterns:
| Deprecated Pattern | Replacement |
|---|---|
claude-4-opus |
claude-opus-4-8 |
claude-sonnet-4 |
claude-sonnet-4-6 |
claude-4-opus-20250615 |
claude-opus-4-8 |
claude-sonnet-4-20250615 |
claude-sonnet-4-6 |
claude-4 (generic) |
Depends on context — scanner flags for review |
messages.create with Claude 4 |
Update model parameter |
ChatAnthropic with old IDs |
Update model_name parameter |
Claude4 (LlamaIndex) |
Update model enum |
Framework Auto-Detection
The scanner doesn't just find deprecated model IDs — it identifies which framework you're using so it can show you the right fix:
- Python SDK —
import anthropic→ shows updatedmessages.create()code - Node.js SDK —
import Anthropic from '@anthropic-ai/sdk'→ shows updated constructor - LangChain —
ChatAnthropic→ shows updated model_name parameter - LlamaIndex —
Claude4→ shows updated model reference - Vercel AI SDK —
import { anthropic } from '@ai-sdk/anthropic'→ shows updated provider - CrewAI — Agent configs → shows updated model string
- Haystack —
AnthropicGenerator→ shows updated model parameter - cURL — Direct API calls → shows updated curl command
Privacy First: Client-Side Scanning
The scanner runs entirely in your browser. Your code is:
- ✅ Never uploaded to any server
- ✅ Never stored in any database
- ✅ Never logged in any analytics
- ✅ Processed locally using JavaScript in your browser tab
This matters because many developers can't share proprietary code with external services. With the APIpulse scanner, your code never leaves your machine.
How to Use the Scanner
- Go to the scanner page
- Paste your code into the text area (or click "Upload File")
- Click "Scan for Deprecated References"
- Review the results — see every deprecated pattern, line numbers, and context
- Get the fixes — free scan shows what to change; Pro shows exact replacement code for your framework
🎯 API Cost Score
Rate your API setup — get a letter grade in 30 seconds
The whole process takes about 10 seconds.
Stop Debugging 410 Errors — Find the Problem in 10 Seconds
Free scan, client-side, no signup. Paste your code and see every deprecated reference instantly.
Scan My Code Free →What If I Need Help Fixing the Code?
The free scan tells you what needs to change. If you want to know how to change it — the exact replacement code for your specific framework — that's what Pro is for.
Pro ($29 one-time) gives you:
- Exact replacement code for your framework (not generic advice)
- Model ID mapping — every deprecated ID → its replacement
- Cost comparison — how much you'll save on the new model
- Provider recommendations — Anthropic, AWS Bedrock, or Google Vertex?
- Saved scenarios — track multiple codebases or services
- PDF migration report — share with your team
Most developers save more than $29 in their first month after switching from Claude 4 to cheaper alternatives.
Related Resources
- Migration Scanner — find deprecated code instantly
- Migration Checklist — print-ready cheat sheet with all model IDs and code
- Claude 4 Is Down — emergency migration guide
- Framework Migration Guide — detailed per-framework instructions
- Day 3 Aftermath — what happened after the shutdown
- Pro Features — full feature list and pricing