Claude 4 Migration Hub
Everything you need to migrate before June 15: 18 head-to-head comparisons, 39 alternatives, calculators, code snippets, and step-by-step guides.
⚡ Quick Picks — Top Replacements
Don't have time to compare all 39? Start here.
Claude Opus 4.8
DeepSeek V4 Pro
DeepSeek V4 Flash
📊 All 18 Head-to-Head Comparisons
Claude 4 Opus vs every major competitor. Claude 4 Sonnet vs every major competitor.
Claude 4 Opus Comparisons
Opus vs Opus 4.8
The path of least resistance. Same provider, same API key, one-line model name change.
Compare →Opus vs Sonnet 4.6
Drop from Opus to Sonnet tier. Same provider, bigger savings, slightly lower quality.
Compare →Opus vs GPT-5.5 Pro
OpenAI's best model vs Claude's best. Compare quality, speed, and pricing.
Compare →Opus vs Gemini 3.1 Pro
Google's latest with 1M context window. Strong coding and reasoning.
Compare →Opus vs DeepSeek V4 Pro
Near-Claude quality at a fraction of the cost. The value champion.
Compare →Opus vs Llama 4 Maverick
Self-hostable open-source alternative. Full control, no vendor lock-in.
Compare →Opus vs Mistral Medium 3.5
European AI lab with strong coding models. GDPR-friendly option.
Compare →Claude 4 Sonnet Comparisons
Sonnet vs Sonnet 4.6
Same price, 5x context (1M vs 200K). Strict upgrade with zero cost increase.
Compare →Sonnet vs Opus 4.8
Worth the premium if you need maximum quality. The premium Anthropic option.
Compare →Sonnet vs Gemini 3.1 Pro
Google's latest with massive context. Strong alternative for coding tasks.
Compare →Sonnet vs DeepSeek V4 Pro
The biggest savings jump. Claude Sonnet quality at DeepSeek prices.
Compare →🛠️ Migration Tools
Calculate, compare, and migrate with our interactive tools.
Deprecation Calculator
Enter your Claude 4 usage, see exact costs on every alternative.
Open Calculator →Migration Cheat Sheet
60-second switch guide. Quick picks, code changes, cost table.
View Cheat Sheet →Migration Command Center
Full dashboard with timelines, checklists, and progress tracking.
Open Dashboard →Migration Cost Calculator
Compare monthly costs across all providers with your exact usage.
Calculate Costs →📚 Guides & Articles
Step-by-step guides, checklists, and deep dives.
Last-Chance Migration Guide
Days left. Exact code changes, cost savings (67-97%), and a 30-minute migration plan.
Read Guide →Full Migration Guide
Step-by-step guide with code samples, cost comparisons, and 39 alternatives.
Read Guide →Sonnet 4.6 Migration
One-line model ID change. Same price, 5x context. The fastest migration path.
Fix Now →Migration Checklist
Day-by-day plan with code changes, cost comparisons, and a printable checklist.
Get Checklist →Claude 4 Error Fix
Getting 410 errors? Model not found? Fix it in 60 seconds.
Fix Errors →API Status Monitor
Real-time Claude 4 API status — check if it's still working.
Check Status →Cheapest LLM APIs 2026
All 39 models ranked by price. Find the cheapest for your use case.
See Rankings →GPT-5 vs Claude Pricing
Head-to-head pricing of all 14 GPT-5 and Claude models.
Compare Pricing →Save Even More with APIpulse Pro
Pro users get personalized optimization recommendations that cut costs by 30-40% beyond model switching.
- Save & compare up to 10 migration scenarios
- Export migration cost reports for your team
- Get personalized optimization recommendations
- Priority email support during migration
- Early access to new pricing data
Lock in $29 — Founding Member
14-day money-back guarantee. No questions asked.
Frequently Asked Questions
When is Claude 4 being deprecated?
Claude 4 Opus and Claude Sonnet 4 are both being retired on June 15, 2026. After this date, API calls to these model IDs will return errors. You must migrate to a replacement model before then.
What is the cheapest alternative to Claude 4 Opus?
DeepSeek V4 Flash is the cheapest at $0.14/$0.28 per million tokens — 99% cheaper than Claude 4 Opus ($15/$75). For similar quality, DeepSeek V4 Pro at $0.435/$0.87 is 97% cheaper. The direct Anthropic replacement, Claude Opus 4.8, is 67% cheaper at $5/$25.
Do I need a new API key to migrate from Claude 4?
No. If staying with Anthropic, your existing API key works with Claude Opus 4.8 and Sonnet 4.6. Only the model name string in your code changes. If switching providers, you'll need a new API key from the new provider.
How do I migrate from Claude 4 to another model?
Change one line of code: replace the model name string (e.g., 'claude-4-opus' → 'claude-opus-4-8'). Your API key, SDK, and endpoint stay the same. The entire migration takes under 5 minutes for most codebases.
What happens if I don't migrate before June 15?
All API calls to claude-4-opus and claude-sonnet-4 model IDs will return HTTP 410 Gone errors. Your application will stop working until you update the model name. There is no grace period.
How much can I save by switching from Claude 4?
Savings range from 67% (Claude Opus 4.8) to 99% (DeepSeek V4 Flash). For a typical workload of 10M input + 2M output tokens/month, Claude 4 Opus costs $300/month. The same workload on Claude Opus 4.8 costs $100/month, and on DeepSeek V4 Pro it costs just $6.09/month.
Get the Claude 4 Migration Checklist
Step-by-step guide with code samples, cost comparisons, and a deadline tracker. Free, no spam.
Don't wait until your code breaks.
Migrate now while you have time to test. Most teams complete the switch in under an hour.
Start Your Migration →