Why am I getting 410 Gone errors from Claude API?

Anthropic retired Claude 4 Opus and Claude Sonnet 4 on June 15, 2026. All API calls to these model IDs now return HTTP 410 Gone. You must update your code to use Claude Opus 4.8, Claude Sonnet 4.6, or switch to an alternative provider like DeepSeek, OpenAI, or Google.

How do I fix Claude 4 410 errors in Python?

In Python, change your model ID from 'claude-4-opus-20250615' to 'claude-opus-4-8' (or 'claude-sonnet-4-6'). If using the Anthropic SDK, no other changes needed — same API key, same base_url. If switching to DeepSeek, also change base_url to 'https://api.deepseek.com/v1' and get a new API key.

What's the cheapest alternative to Claude 4?

DeepSeek V4 Flash at $0.14/$0.28 per million tokens is 99% cheaper than Claude 4 Opus. DeepSeek V4 Pro at $0.44/$0.87 is 97% cheaper with similar quality. For staying with Anthropic, Claude Opus 4.8 is 67% cheaper at $5/$25.

Do I need a new API key to fix Claude 410 errors?

If staying with Anthropic (switching to Opus 4.8 or Sonnet 4.6), no — your existing API key works. Just change the model name. If switching to DeepSeek, OpenAI, or Google, you'll need a new API key from that provider.

How long does it take to fix Claude 4 410 errors?

If staying with Anthropic: 2 minutes (change model name, redeploy). If switching providers: 5-10 minutes (get new API key, change model name and base_url, redeploy). The actual code change is always 2 lines.

Still Getting Claude 410 Errors? Here's Your 5-Minute Fix (June 2026)

BEST VALUE DeepSeek V4 Pro

$0.44 / $0.87

per 1M tokens · 97% cheaper

To switch to DeepSeek (Python):

✅ DeepSeek — 97% cheaper

# pip install openai
from openai import OpenAI

client = OpenAI(
    base_url="https://api.deepseek.com/v1",
    api_key="sk-your-deepseek-key"
)

response = client.chat.completions.create(
    model="deepseek-v4-pro",
    messages=[{"role": "user", "content": "Hello"}]
)

💡 Get a DeepSeek API key at platform.deepseek.com — free tier available.

Complete Model ID Reference

Here are all the model IDs you need. Bookmark this:

Provider	Model ID	Price (in/out)	Savings
Anthropic	claude-opus-4-8	$5 / $25	67%
Anthropic	claude-sonnet-4-6	$3 / $15	80%
OpenAI	gpt-5	$1.25 / $10	92%
Google	gemini-2.5-pro	$1.25 / $10	90%
DeepSeek	deepseek-v4-pro	$0.44 / $0.87	97%
DeepSeek	deepseek-v4-flash	$0.14 / $0.28	99%

5 Common Migration Mistakes to Avoid

Forgetting hidden config files. Check environment variables, YAML configs, JSON files, and CI/CD pipelines — not just your main codebase. 25% of migration issues come from forgotten config files.
Not testing with real traffic. Deploy to staging first. Some providers have different rate limits, token counting, or streaming behavior.
Assuming identical quality. DeepSeek V4 Pro handles 90% of tasks well but struggles with complex multi-step reasoning. Test with YOUR actual use case.
Forgetting to update monitoring. If you have alerts for Claude 4 errors, update them for the new model. Otherwise you'll miss real issues.
Not checking token counting. Different providers count tokens differently. A "10M token" workload on Claude might be 12M on DeepSeek. Monitor your first week's costs.