OpenAI Sunsets GPT-4.5 & O3 Models: Act Now!

OpenAI is discontinuing its o3 and GPT-4.5 models. The o3 model will be retired on August 26th, and the GPT-4.5 model on June 27th. This means these models will no longer be available via the API after these dates. Paid subscribers and enterprise clients using these models through the OpenAI API are directly affected. They must update their configurations and codebases. OpenAI is removing older models to optimize its infrastructure and encourage users to transition to newer, more capable models like the upcoming GPT-5 series. Developers need to audit their current model IDs and create a migration plan to switch to alternatives such as GPT-5.5, GPT-5.4, GPT-5.3, or GPT-5.2. Testing thoroughly is crucial before deploying changes. This matters because anyone relying on these models for their core operations needs to act quickly to avoid service interruptions.