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PERMANENTLY OFFLINE — JUNE 15, 2026

Claude 4 Is Dead

Claude 4 Opus and Sonnet 4 have been permanently retired. Your API returns 410 errors. Here's the 5-minute fix and the cheapest path back online.

Find My Replacement → Cost Calculator

The 5-Minute Fix

Change one string in your code. Same API, same key, same parameters.

JavaScript / TypeScript

// Before (returns 410 Gone)
model: "claude-4-opus"

// After (official successor — 67% cheaper)
model: "claude-opus-4-8"

// For Sonnet:
model: "claude-4-sonnet"  →  model: "claude-sonnet-4-6"

Python

# Before
model="claude-4-opus"

# After
model="claude-opus-4-8"

Find all references in your project

grep -r "claude-4-opus\|claude-4-sonnet" --include="*.js" --include="*.ts" --include="*.py" --include="*.json" .

Your Options (Ranked)

Pick the right replacement for your use case and budget.

🏆 Claude Opus 4.8

$5 / $25

Save 67% vs Claude 4

Official successor. Same API, same key. Best quality.

Cheapest option. Great code quality. 15-min migration.

Free tier: 60 req/min. Good for prototyping.

FREE

🧠 GPT-5

$1.50 / $3.00

Save 80%

Best ecosystem. Strong at everything. 30-min migration.

Not Sure Which One? Take the Quiz

Answer 3 questions. Get a personalized recommendation with code snippets and cost estimates in 60 seconds.

Find My Replacement →

🚀 Save Even More With Pro — $29 One-Time

Pro users get personalized model routing — use cheap models for 80% of tasks, premium only when needed. Save up to 40% beyond your base savings. Plus saved scenarios, PDF cost reports, and pricing change alerts.

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FAQ

Is Claude 4 really dead?

Yes. Claude 4 Opus and Sonnet 4 were permanently retired on June 15, 2026. All API calls return HTTP 410 Gone. Anthropic has fully transitioned to the 4.x generation (Opus 4.8, Sonnet 4.6). The deprecated model IDs will never return.

What replaced Claude 4?

Claude Opus 4.8 ($5/$25 per 1M tokens) is the official successor — same API, same key, 67% cheaper. For even more savings, DeepSeek V4 ($0.14/$0.28) is 99% cheaper. Use our interactive Replacement Finder to pick the best option for your use case.

How do I fix Claude 4 410 errors?

Replace 'claude-4-opus' with 'claude-opus-4-8' or 'claude-4-sonnet' with 'claude-sonnet-4-6' in your code. Same API, same key, same parameters. Takes 5 minutes. Run grep -r 'claude-4-opus|claude-4-sonnet' to find all references.

Will Claude 4 come back?

No. The shutdown is permanent. Anthropic has fully transitioned to the 4.x generation. The deprecated model IDs will never return.