Name: Claude Sonnet 4 API Access
Brand: Anthropic

Question 1

When is Claude Sonnet 4 retired?

Accepted Answer

Anthropic has deprecated Claude Sonnet 4; the retirement date is 2026-06-15. After that date, requests to this model id will fail at the upstream API. Migrate to Claude Sonnet 4.6 before then.

Question 2

Can I still use Claude Sonnet 4 today?

Accepted Answer

Yes. Claude Sonnet 4 accepts requests on 1vy at $3.45/1M input tokens and $17.25/1M output tokens. Plan your migration to Claude Sonnet 4.6 to avoid disruption at retirement.

Question 3

How do I migrate from Claude Sonnet 4 to Claude Sonnet 4.6?

Accepted Answer

Claude Sonnet 4.6 is available at https://1vy.ai/models/claude-sonnet-4-6 and is a drop-in replacement via the same OpenAI-compatible endpoint. Change the model parameter in your OpenAI SDK call from "claude-sonnet-4" to "claude-sonnet-4-6".

Direction	Price / 1M tokens (USD)
Input	$3.45
Output	$17.25

Claude Sonnet 4

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