Claude 4 deprecation calculator, Claude Opus migration, Claude Sonnet 4 replacement, LLM migration cost, Claude 4 retiring June 2026">

Claude 4 Deprecation Calculator

Claude 4 Opus and Sonnet 4 retire June 15, 2026. Enter your current usage to see exactly what you'll pay after migration — and how much you'll save.

⚠️ Claude 4 shut down June 15, 2026 — migrate now

June 15 deadline passed: API calls to claude-4-opus and claude-sonnet-4 now return errors. The good news: replacements are cheaper and better.

1. Which model are you using?

Claude 4 Opus
$15.00 / $75.00 per 1M tokens
Retired June 15
Claude Sonnet 4
$3.00 / $15.00 per 1M tokens
Retired June 15
CurrentReplacementPrice ChangeContext
Claude 4 Opus Claude Opus 4.8 $15→$5 in, $75→$25 out (67% cheaper) 200K → 1M

2. Enter your monthly usage

Total input tokens per month in millions
Total output tokens per month in millions
Used for daily cost breakdown
Defaults to calculated if requests provided

You'll save

$0

per month by migrating

Current Monthly Cost
$0
Claude 4 Opus
After Migration
$0
Claude Opus 4.8
Monthly Savings
$0
per month
Annual Savings
$0
per year

Compare All Alternatives — Monthly Cost & Savings

Every non-deprecated model ranked by savings vs your current ' + (selectedModel === 'opus' ? 'Claude 4 Opus' : 'Claude Sonnet 4') + ' usage.

3. Code migration — it's just one line

Change the model name string. Your API key, endpoint, and SDK stay the same.

Before (deprecated)
const response = await anthropic.messages.create({
  model: "claude-4-opus",
  max_tokens: 1024,
  messages: [{ role: "user", content: "..." }]
});
After (replacement)
const response = await anthropic.messages.create({
  model: "claude-opus-4-8",
  max_tokens: 1024,
  messages: [{ role: "user", content: "..." }]
});

Deadline: June 15 — PASSED

Compare all 67 alternatives to Claude 4 and find the cheapest replacement for your workload.

Complete Deprecation Guide → Open Migration Tool → Migration Checklist Step-by-Step Guide Deprecation FAQ Full Calculator Migration Cheat Sheet Cheapest LLM APIs GPT-5 vs Claude

Save & export your migration plan

Free tools let you save cost comparisons, export PDF reports, and receive alerts when prices change.

Free Tools → Free Tools →

Frequently Asked Questions

How much cheaper is Claude Opus 4.8 vs Claude 4 Opus?
Claude Opus 4.8 costs $5/$25 per million tokens vs Claude 4 Opus at $15/$75. That's 67% cheaper on both input and output. For a workload of 10M input + 2M output tokens/month, you'd save ~$200/month.
Do I need a new API key?
No. Your Anthropic API key continues to work. The only change is the model name string in your code. The API endpoint, authentication, and SDK all stay the same.
What if I don't migrate?
API calls to the deprecated model IDs return errors. Your app breaks until you update the model name. Migrate now to restore functionality.
Is the replacement model worse?
No — it's strictly better. Claude Opus 4.8 has 5x the context window (1M vs 200K), improved reasoning, and costs 67% less. The same is true for Sonnet 4.6.
Can I test the replacement before switching?
Yes. Run both models in parallel on the same prompts for 1-2 weeks. Compare output quality, latency, and cost. Only cut over once you're confident the quality meets your needs.

Get the Claude 4 Migration Checklist

Step-by-step guide with code samples, cost comparisons, and a deadline tracker. Free, no spam.

This was a snapshot. What about next month?
Prices change. New models launch. Our tools catch what a one-time calculation can't — and saves you money every month.
Free Tools → 🔍 Free audit first

All Tools Are Free

No signup required to 67-model comparison, migration code snippets, PDF reports, price alerts, and cost monitoring. ✅ All tools free.

Free Tools →