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GPT-5.x

Model family at OpenAI · 26 models

Every version, including new ones

Models

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Updates

GPT-5.4, GPT-5.4 mini, GPT-5.4 nano

8 products from OpenAI and Perplexity AI

Retired

Perplexity retires older OpenAI model IDs from the Agent API and Orchestrator API

The changelog scheduled seven older OpenAI model IDs to retire on October 24, 2026 at 00:00 UTC. After the cutoff the IDs are no longer accepted or returned by model-list endpoints.

Before

openai/gpt-5.4, gpt-5.4-mini, gpt-5.4-nano, gpt-5.2, gpt-5.1, gpt-5 and gpt-5-mini accepted

After

These model IDs are no longer accepted

Action needed:
Switch direct model selections and fallback chains to a current OpenAI model such as openai/gpt-6-luna or openai/gpt-6-sol.

GPT-5.4-Cyber

Model at OpenAI

Retired

GPT-5.4-Cyber removed from the API

The gpt-5.4-cyber model was scheduled for removal from the API on October 1, 2026, and the deprecations page now lists it under past deprecations. OpenAI recommends the most capable cyber model available to each customer.

Action needed:
Switch to the most capable cyber model available to you, such as GPT-5.6 Cyber through Daybreak Red.