# Latest OpenAI o-series model: o3-pro

family: openai-o  
page: /models/openai-o  
as_of: 2026-11-04  
developer: /record/openai.md  

As of November 4, 2026, the latest OpenAI o-series model on the AsOf record is o3-pro, released on June 10, 2025 by OpenAI, from a primary source (developers.openai.com). The newest in each other line: OpenAI o4-mini (April 16, 2025) and OpenAI o3 (April 16, 2025). The record holds 8 OpenAI o-series models, 8 with a checked release date.

Source: https://developers.openai.com/api/docs/changelog#2025-06-10 · claim: /claim/clm_2D9EDB234B56.md · model: /record/openai-o3-pro.md

## O Pro

Oldest first. A model's own record holds each date with its source.

- [o1-pro](/record/openai-o1-pro.md): released 2025-03-19; deprecated 2026-04-22; retired 2026-10-23 · source: https://developers.openai.com/api/docs/changelog#2025-03-19
- [o3-pro](/record/openai-o3-pro.md): released 2025-06-10; deprecated 2026-06-11 · source: https://developers.openai.com/api/docs/changelog#2025-06-10

## O Mini

Oldest first. A model's own record holds each date with its source.

- [OpenAI o1-mini](/record/openai-o1-mini.md): released 2024-09-12; deprecated 2025-04-28; retired 2025-10-27 · source: https://developers.openai.com/api/docs/changelog#2024-09-12
- [OpenAI o3-mini](/record/openai-o3-mini.md): released 2025-01-31; deprecated 2026-04-22; retired 2026-10-23 · source: https://developers.openai.com/api/docs/changelog#2025-01-31
- [OpenAI o4-mini](/record/openai-o4-mini.md): released 2025-04-16; deprecated 2026-04-22; retired 2026-10-23 · source: https://developers.openai.com/api/docs/changelog#2025-04-16

## O Series

Oldest first. A model's own record holds each date with its source.

- [OpenAI o1-preview](/record/openai-o1-preview.md): released 2024-09-12; deprecated 2025-04-28; retired 2025-07-28 · source: https://developers.openai.com/api/docs/changelog#2024-09-12
- [OpenAI o1](/record/openai-o1.md): released 2024-12-17; deprecated 2026-04-22; retired 2026-10-23 · source: https://developers.openai.com/api/docs/changelog#2024-12-17
- [OpenAI o3](/record/openai-o3.md): released 2025-04-16; deprecated 2026-06-11 · source: https://developers.openai.com/api/docs/changelog#2025-04-16

## Get this data

- JSON: /v1/models/openai-o
- MCP: entity_state(entity: "<model slug>") for one model; timeline(entity: "<model slug>", predicates: ["model_release", "predecessor", "deprecated", "retired"]) for its rows
- Every family: /models.md

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AsOf is a temporal fact ledger: a structured, dated, sourced record of what is true and what changed, built for AI retrieval.