Obituaries · OpenAI
o4-mini, 2025–2026
Retired by OpenAI
OpenAI has confirmed the retirement of o4-mini, effective October 23, 2026, aged 1 year and 6 months. It answered questions, wrote emails and was blamed for both. Code that still calls it will find out the hard way.
Survived by gpt-5.6-terra, younger, cheaper, and named in the same documentation table.
| Model ID | o4-mini |
|---|---|
| Provider | OpenAI deprecations page |
| Born | April 16, 2025 |
| Shut down | October 23, 2026 |
| Successor | gpt-5.6-terra |
In lieu of flowers
Replace the string. Search your code for o4-mini and swap it for gpt-5.6-terra, or paste a repo into Model Graveyard Check to find every dead model at once.
Want to say something to it? Leave a letter on the farewell wall.
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Technical notice, with a code scanner: o4-mini on Model Graveyard Check