AI Models
31 July 2026
OpenAI to Restrict Access to GPT-5.4 via ChatGPT
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New-ZZZ desk
X @OpenAIDevs · 1 week ago
Starting August 31, GPT-5.4 and GPT-5.4 mini will no longer be available to users who authenticate through ChatGPT. However, the models will remain available in the OpenAI API and in Codex sessions authenticated with an API key.
The team also reported that improvements to GPT-5.6’s efficiency helped reduce model costs by 80% for Luna and by 20% for Terra.
Why it matters
- —Users accessing GPT-5.4 and GPT-5.4 mini through ChatGPT authentication will need to change their access method.
- —Developers will be able to continue using the models through the API and Codex with an API key.
- —GPT-5.6 optimization significantly reduces model costs for certain products.
Key facts
- Access restrictions for GPT-5.4 and GPT-5.4 mini will take effect on August 31.
- The models will remain available through the OpenAI API.
- Access will remain available in Codex sessions authenticated with an API key.
- Model costs decreased by 80% for Luna and 20% for Terra.
The full text is in the original source. Here we provide a brief summary and key facts.
