ThreadlineTimeline
All timelines

Recorded event

Recorded event

OpenAI begins rolling out GPT-4o

OpenAI introduced GPT-4o and began rolling out text and image capabilities in ChatGPT, with text and vision access through its API.

Read context

The new voice experience was scheduled for a later rollout.

Sources

Read the evidence behind this timeline.

Source descriptions are written by Threadline

OpenAIPrimary record

GPT-4o launch and staged feature rollout

openai.com

Vendor announcement used to verify launch timing and availability, not independent performance rankings.

Published: 5/13/2024
Source checked: 9/21/2026

Revision 1 / Reviewed 9/21/2026

Connected timelines

AI competition: reasoning models and new releases