At a glance: OpenAI is optimizing its GPT-5.5-Instant model while initiating the discontinuation of legacy models.
OpenAI has rolled out an update for the GPT-5.5-Instant model and simultaneously announces the discontinuation of several older models, including o3.
OpenAI has released an enhancement for the existing GPT-5.5-Instant model. The update aims to increase the performance of the fast variant model and will be made available to developers who rely on this model in their applications.
In parallel, OpenAI announced the planned discontinuation of several older model variants. This includes the o3 model, which is to be phased out. This consolidation of the model landscape is part of OpenAI’s strategy to concentrate maintenance and focus resources on newer generations.
CTOs should plan to review their integration of affected legacy models and migrate to newer variants. OpenAI is expected to communicate migration guidelines and timelines for discontinuation to prevent production disruptions.
Source: www.bleepingcomputer.com · Published June 3, 2026
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