Is Claude 4 Opus deprecated?

Yes. Claude 4 Opus was deprecated by Anthropic on June 15, 2026. It has been replaced by Claude Opus 4.8 ($5/$25 per 1M tokens), which offers better performance at 67% lower cost. Claude Sonnet 4 was also deprecated and replaced by Claude Sonnet 4.6 ($3/$15).

What is the cheapest alternative to Claude 4 Opus?

DeepSeek V4 Flash at $0.14/$0.28 per 1M tokens is 97% cheaper than Claude 4 Opus ($15/$75). For similar quality, Claude Opus 4.8 ($5/$25) is 67% cheaper. Gemini 3.1 Pro ($2/$12) is 87% cheaper with a 1M context window.

How do I migrate from Claude 4 to Claude Opus 4.8?

Change your model parameter from 'claude-4-opus' to 'claude-opus-4-8'. The API format is identical. Your existing code, prompts, and system messages work without changes. See the migration guide above for the one-line code change.

Will my Claude 4 API calls stop working?

Yes. After June 15, 2026, API calls to Claude 4 Opus and Claude Sonnet 4 will return errors. You must migrate to Claude Opus 4.8 or Claude Sonnet 4.6 before the deadline. The API format is identical, so migration is a single model name change.

Claude 4 Is Deprecated — Here's What to Do

Claude 4 Opus and Claude Sonnet 4 were retired on June 15, 2026. If your code still uses these models, your API calls are failing. Here's how to fix it — and save 67-97% in the process.

Migration in 3 Steps

Find your Claude 4 model references

Search your codebase for claude-4-opus, claude-opus-4, claude-sonnet-4, or claude-4-sonnet. These are the deprecated model names.

Replace with the new model name

The API format is identical — just change the model parameter:

                        - model: "claude-4-opus"

                        + model: "claude-opus-4-8"

                        - model: "claude-sonnet-4"

                        + model: "claude-sonnet-4-6"

Test and deploy

Your existing prompts, system messages, and API format work without changes. Deploy the update and verify your API calls succeed.

Tools & Resources

📊 Calculate migration costs 🔄 Compare all 34 alternatives 📋 60-second cheat sheet ✅ Migration checklist 🔀 Provider switch calculator 💰 Cost optimization report

Top Alternatives to Claude 4

Claude Opus 4.8

Anthropic

$5/$25

67% cheaper than Claude 4 Opus

Recommended

Gemini 3.1 Pro

Google

$2/$12

87% cheaper, 1M context

Best Value

GPT-5.5

OpenAI

$5/$30

73% cheaper on input

Premium

DeepSeek V4 Pro

DeepSeek

$0.44/$0.87

97% cheaper — lowest cost

Cheapest

Frequently Asked Questions

Will my Claude 4 API calls start working again?

No. Claude 4 Opus and Sonnet 4 are permanently retired. You need to update your model name to Claude Opus 4.8 or Claude Sonnet 4.6. The API format is identical — just change the model parameter.

Do I need to rewrite my prompts?

No. Claude Opus 4.8 and Sonnet 4.6 use the same API format, prompt structure, and system message format. Your existing code works with just a model name change.

What if I need the cheapest possible option?

DeepSeek V4 Flash ($0.14/$0.28) is 99% cheaper than Claude 4 Opus. Gemini 2.0 Flash ($0.10/$0.40) is even cheaper on input tokens. Use the Provider Switch Calculator to see exact costs for your usage.

Can I use multiple models for different tasks?

Yes — and you should. Use budget models (DeepSeek V4 Flash, Gemini Flash) for simple tasks like classification and summarization, and premium models (Claude Opus 4.8, GPT-5.5) for complex reasoning. The AI Stack Cost Optimizer helps you find the cheapest combination.

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