# o1-preview

> The first model sold on the promise that it would think before it answered, and the first to bill you for tokens you were never allowed to read. It made a thirty-second wait feel like a feature rather than a fault, and every reasoning model since has been built on that bargain.

2024-09-12 — 2025-07-28 · lived 10 months

## Last words

It would spend a full minute on a question, and be right.

## The record

- Provider: OpenAI
- Model id: `o1-preview`
- Cause of death: Superseded
- Notice given: 2025-04-28
- Context window: 128,000 tokens
- Cost per Mtok: $15 in · $60 out
- Succeeded by: [o1](https://models.rip/o1/epitaph) (this archive's reading of lineage, not the provider's migration guidance)

## Sources

- https://developers.openai.com/api/docs/deprecations
- https://developers.openai.com/api/docs/changelog

## Elsewhere

- [Stand at this grave](https://models.rip/o1-preview)
- [The OpenAI plot](https://models.rip/openai)
- [The whole cemetery](https://models.rip/)