OpenAI retires older models, upgrades GPT-5.5 Instant
GPT-5.5 Instant now delivers smoother, more natural conversations...
OpenAI has rolled out updates to its GPT-5.5 Instant model, enhancing response style and quality to deliver more natural, conversational interactions and better-paced assistance for practical tasks. The improvements aim to make interactions feel more human-like while maintaining efficiency.
As part of this transition, OpenAI announced the retirement of older models, including the o3 and GPT-4.5, from ChatGPT. The o3 model will be deprecated by August 26, 2026, and GPT-4.5 will follow on June 27, 2026. Users relying on these models are encouraged to migrate to newer versions to avoid disruptions.
- GPT-5.5 Instant now offers improved response style and pacing for natural conversations and practical tasks
- OpenAI will retire o3 by August 26, 2026, and GPT-4.5 by June 27, 2026
- Users are advised to migrate to newer models to avoid disruptions
Why It Matters
Businesses using older models must upgrade to avoid service disruptions and leverage improved interaction quality.