Here’s a list of the OpenAI core GPT models, based on the most recent information (as of June 2025):
| Model Name | Release Date | Description |
| GPT-3 | June 2020 | 175B parameter model; first major public model for text generation |
| GPT-3.5 | Nov 2022 | Improved version of GPT-3; used in free ChatGPT launch |
| GPT-4 | Mar 2023 | Major leap in reasoning, language fluency, and safety |
| GPT-4-turbo | Nov 2023 | Cheaper, faster variant of GPT-4; default in ChatGPT Plus |
| GPT-4o (Omni) | May 2024 | Multimodal (text, image, audio input/output); free for all users |
| GPT-4-mini | Early 2024 (internal) | Lightweight variant for faster, low-resource environments (e.g., mobile tasks, background inference) |
| GPT-4-high | Internal use (2024+) | High-capacity/context versions (128K tokens, enterprise-tier access) |
| GPT-4.5 | Feb 2025 | Intermediate model between GPT-4 and GPT-5; improved reasoning, context, and performance; available to Pro users |
| GPT-4.1 | Apr 2025 | Major improvements in coding, instruction following, and long context (up to 1M tokens); API and paid ChatGPT users; 21%+ better coding than GPT-4o |
| GPT-4.1 mini | Apr 2025 | Smaller, faster, and cheaper version of GPT-4.1 for lightweight applications |
| GPT-4.1 nano | Apr 2025 | Smallest GPT-4.1 model; optimized for speed and cost; suitable for simple tasks and large-scale deployments |
| GPT-4o mini | Nov 2024 / Apr 2025 | Cost-efficient, fast variant of GPT-4o; updated for both API and ChatGPT users |
| OpenAI o3 | Apr 2025 | State-of-the-art reasoning model; excels at coding, math, science, and visual perception; sets new benchmarks in analysis and creative ideation |
| OpenAI o3-mini | Jan 2025 | Cost-efficient reasoning model; optimized for coding, math, and science; supports structured outputs and function calling |
| OpenAI o4-mini | Apr 2025 | Faster, more affordable reasoning model; part of the o-series for complex, multi-step tasks |
Upcoming:
- GPT-5 is expected to launch in summer 2025, according to recent statements from OpenAI leadership.
Compiling this list confirmed why it’s such a challenge to keep track of all the options out there, and this is the list from just one of the major players. Each one of the other companies has their own list of products and versions for us to kick the tires on.
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