Modelpeers

Perplexity Agent API changelog

Every change to Perplexity Agent API that Modelpeers has recorded, newest first, each with the source it came from. The record starts Aug 27, 2026.

All (5)Releases (2)Retiring (1)Prices/limits (2)

October 2026

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

Who is affected:
Developers who select these OpenAI models directly or in fallback chains in the Agent API or Orchestrator API.
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.

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