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Perplexity· SonarUpcoming retirement of older OpenAI models
OpenAI retiring five GPT-5 model versions on October 24, 2026
Perplexity will retire several older OpenAI model IDs (openai/gpt-5.4, openai/gpt-5.4-mini, openai/gpt-5.4-nano, openai/gpt-5.2, openai/gpt-5.1, openai/gpt-5, openai/gpt-5-mini) from its Agent API and Router API on October 24, 2026.
Users must update direct model selections and fallback chains before the cutoff; after that date the retired IDs will no longer be accepted or returned by model-list endpoints.
From the source
On October 24, 2026 at 00:00 UTC, the Agent API and Router API will retire these model IDs: openai/gpt-5.4 ... After the cutoff, the retired IDs will no longer be accepted or returned by model-list endpoints.
docs.perplexity.ai
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