# Using GPT-4 Turbo? It stops responding July 1. Migrate to GPT-4.1

OpenAI confirmed the shutdown date. Drop-in switch for most uses; function-calling payloads need one change.

By Neomanex. Updated 2026-10-07.

OpenAI has set a hard deprecation date for GPT-4 Turbo: all endpoints stop responding on July 1, 2026. Unlike previous soft deprecations, there is no extended sunset period for existing API keys.

For most chat and completion workloads, GPT-4.1 is a drop-in replacement — same request shape, comparable latency, lower per-token cost. The exception is function calling: GPT-4.1 rejects the legacy `function_call` parameter and requires the `tools` array format.

If you run automations through n8n, Make, or Zapier, check each OpenAI node — older workflow templates still pin `gpt-4-turbo` explicitly and will start failing silently on July 1.

Canonical: https://neomanex.com/news/gpt-4-turbo-shutdown