Why is Claude 4 returning 410 errors?

Anthropic retired Claude 4 Opus and Claude Sonnet 4 on June 15, 2026. API calls to these model IDs now return HTTP 410 Gone. Update your model ID to claude-opus-4-8 or claude-sonnet-4-6.

What replaced Claude 4?

Claude Opus 4.8 ($5/$25) and Claude Sonnet 4.6 ($3/$15) are the official successors. Same API format, same key, just change the model name. Cheaper alternatives: DeepSeek V4 Pro ($0.435/$0.87), Gemini 2.5 Pro ($1.25/$10).

How do I fix Claude 4 API errors?

Search your code for 'claude-4-opus' or 'claude-4-sonnet', replace with 'claude-opus-4-8' or 'claude-sonnet-4-6'. No other changes needed. Same API key, same SDK, same format.

What is the cheapest Claude 4 alternative?

DeepSeek V4 Flash at $0.14/$0.28 per 1M tokens is 99% cheaper than Claude 4 Opus ($15/$75). For similar quality, DeepSeek V4 Pro at $0.435/$0.87 is 97% cheaper. Claude Opus 4.8 at $5/$25 is 67% cheaper with identical API.

Is Claude 4 completely gone?

Yes. Claude 4 Opus and Claude Sonnet 4 were retired on June 15, 2026. All API calls return 410 Gone. There is no grace period. You must migrate to a supported model.

Claude 4 Shutdown

Claude 4 Shutdown FAQ: 25 Questions Every Developer Is Asking

Published June 14, 2026 · 12 min read · Updated with latest migration info

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