| Version | Release date | Status | Description |
| GPT-3.5 | November 2022 | Discontinued | The first model used in ChatGPT. |
| GPT-4 | March 2023 | Discontinued | Introduced in March 2023 with the ChatGPT Plus subscription. |
| GPT-4o | May 2024 | Legacy support | Capable of processing text, image, audio, and video, GPT-4o is faster and more capable than GPT-4, and free within a usage limit that is higher for paid subscriptions. |
| GPT-4o mini | July 2024 | Discontinued | A smaller and cheaper version of GPT-4o. GPT-4o mini replaced GPT-3.5 in the July 2024 version of ChatGPT. |
| o1-preview | September 2024 | Discontinued | A pre-release version of OpenAI o1, an updated version that could "think" before responding to requests. |
| o1-mini | September 2024 | Discontinued | A smaller and faster version of OpenAI o1. |
| o1 | December 2024 | Discontinued | The full release of OpenAI o1, which had previously been available as a preview. |
| o1-pro | December 2024 | Discontinued | A version of o1 which uses more compute to get better results, available to ChatGPT Pro subscribers. |
| o3-mini | January 2025 | Discontinued | Successor of o1-mini. |
| o3-mini-high | January 2025 | Discontinued | Variant of o3-mini using more reasoning effort. |
| GPT-4.5 | February 2025 | Discontinued | Particularly large GPT model, and reportedly OpenAI's "last non-chain-of-thought model". |
| GPT-4.1 | April 2025 | Legacy support | First launched exclusively in the OpenAI API in April 2025, GPT-4.1 was later added to ChatGPT in May 2025. |
| GPT-4.1 mini | April 2025 | Discontinued | A smaller and cheaper version of GPT-4.1. Originally launched exclusively in the OpenAI API in April 2025. GPT-4.1 mini replaced GPT-4o mini in the May 2025 version of ChatGPT. |
| o3 | April 2025 | Legacy support | The full release of the o3 model, emphasizing structured reasoning and faster performance compared to earlier "o" series models |
| o4-mini | April 2025 | Legacy support | A compact, high-efficiency version of the upcoming o4 model family, optimized for lower latency and lighter compute requirements. |
| o4-mini-high | April 2025 | Discontinued | Variant of o4-mini using more reasoning effort. |
| o3-pro | June 2025 | Discontinued | A version of o3 which uses more compute to get better results, available to ChatGPT Pro subscribers. |
| GPT-5 | August 7, 2025 | Legacy support | Flagship model replacing all previous available models, available for all free and paid subscribers. The versions GPT-5 Instant, GPT-5 Thinking and GPT-5 Pro affect the reasoning time. The default version GPT-5 Auto uses a router to determine how much reasoning is needed, based on the complexity of the request. |
| GPT-5 mini | August 7, 2025 | Active | Faster, more cost-efficient version of GPT-5 for when users reach their limit for GPT-5 interactions until their usage limit replenishes. |
| GPT-5.1 | November 12, 2025 | Active | Warmer and better at following instructions according to OpenAI. Allows users to select alternative personalities. |
| GPT-5.2 | December 11, 2025 | Active | |
