o1 Preview
OpenAI
Key facts · verified Oct 29, 2026
o1 Preview is an OpenAI model. It was retired on 28 July 2025. Its last listed API price was $15 per million input tokens and $60 per million output tokens. It ranks #181 on LMArena's text leaderboard (Elo 1389, read 1 Nov 2026). Source: developers.openai.com.
o1 Preview (o1-preview) is an OpenAI reasoning model that was available via the API until 28 July 2025, the shutdown date on OpenAI's deprecations page, which names o3 as the replacement. It was priced at $15 per million input tokens and $60 per million output tokens. On LMArena's text leaderboard it had 1389 Elo (rank 181).
Pricing & specs checkedSource: vendor documentation · checked Oct 29, 2026LMArena: 1389 Elo (rank 181) · source · retrieved Nov 1, 2026
Full Specifications
$15 / $60 per million tokens | |
|---|---|
| Identity | |
| Developer | OpenAI |
| Retired | 28 July 2025 |
| Status | Retired. OpenAI's deprecations page lists o1-preview with a shutdown date of 28 July 2025 and o3 as the replacement. |
| Licence | Proprietary |
| Self-hostable | No |
| Cost | |
| Blended $/1M tokensinput × 0.75 + output × 0.25 | $26.250 / 1M tokens |
| Input price | $15.000 / 1M tokens |
| Output price | $60.000 / 1M tokens |
| Measured quality | |
| LMArena Elo | 1389 (checked Nov 2026) |
| LMArena rank | Rank 181 |
| Elo per dollarLMArena Elo ÷ blended $/1M tokens | 53 |