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.

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June 15 deadline approaching: After this date, API calls to claude-4-opus and claude-sonnet-4 will fail. The good news: replacements are cheaper and better.

1. Which model are you using?

Claude 4 Opus
$15.00 / $75.00 per 1M tokens
Retiring June 15
Claude Sonnet 4
$3.00 / $15.00 per 1M tokens
Retiring 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

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 — 13 days left

Compare all 34 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

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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 miss the June 15 deadline?
API calls to the deprecated model IDs will return errors. Your app will break until you update the model name. Migrate before June 15 to avoid downtime.
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.