Modelpeers

GPT-5 changelog

Every change to GPT-5 that Modelpeers has recorded, newest first, each with the source it came from. The record starts Jun 11, 2026.

All (2)Retiring (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.

June 2026

GPT-5, GPT-5 mini, GPT-5 nano

6 models from OpenAI

Retiring

GPT-5 and o3 snapshots to shut down December 11

The August 2025 GPT-5, GPT-5 mini, GPT-5 nano, GPT-5 Pro, o3 and o3-pro snapshots will be removed on December 11, 2026, with GPT-5.6 Sol, Terra or Luna as replacements.

Takes effect Dec 11, 2026 · in 40 days

Who is affected:
Apps pinned to GPT-5 or o3 snapshots.
Action needed:
Migrate to the listed GPT-5.6 replacement before December 11, 2026.

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