OpenAI deprecates tts-1, tts-1-hd, GPT-5.4 nano, GPT-5.3 Codex and GPT-5.1

tts-1, tts-1-hd, GPT-5.4 nano, GPT-5.3 Codex and GPT-5.1 are now deprecated and shut down on 2027-01-06.

Models: tts-1, tts-1-hd, GPT-5.4 nano, GPT-5.3 Codex, GPT-5.1

Read on developers.openai.com

Source: OpenAI API deprecations, checked Oct 2, 2026. Written from a verified change in our dataset.