OpenAI has officially announced that GPT-5.4 and GPT-5.4 mini will be discontinued for ChatGPT users starting August 31. The models will disappear from the web interface and mobile apps for regular users.
Key facts
- Cutoff date: August 31 – discontinuation for ChatGPT-signed-in users
- API remains available – developers can continue using GPT-5.4 and GPT-5.4 mini via OpenAI API with API keys
- Codex sessions – models remain accessible through Codex sessions authenticated with API keys
- Source: OpenAI {bot} on Bluesky, official changelog documentation
What this means
The discontinuation for ChatGPT users represents a significant access restriction: anyone wanting to use these models going forward must switch to API-based solutions, which requires technical setup and incurs per-token costs. For German enterprises relying on GPT-5.4 through the web interface, migration to API-based solutions or alternative models will become necessary. It remains unclear which models OpenAI will offer as replacements for ChatGPT users.
Sources
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