On Wednesday, OpenAI introduced two new reasoning models — o3 and o4-mini — just a few days after launching the GPT-4.5 API for developers. According to a post by OpenAI on X, these “reasoning models can agentically use and combine every tool within ChatGPT, including web search, Python, image analysis, file interpretation, and image generation.”
o3 and o4-mini are super good at coding, so we are releasing a new product, Codex CLI, to make them easier to use.
this is a coding agent that runs on your computer. it is fully open source and available today; we expect it to rapidly improve.
— Sam Altman (@sama) April 16, 2025
“o3 and o4-mini are out! They are very capable. o4-mini is a ridiculously good deal for the price. They can use and combine every tool within ChatGPT. Multimodal understanding is particularly impressive. o3 and o4-mini are super good at coding, so we are releasing a new product, Codex CLI, to make them easier to use. This is a coding agent that runs on your computer. It is fully open source and available today; we expect it to rapidly improve,” wrote Sam Altman, CEO of OpenAI, in a post on X on Wednesday.
Altman also confirmed that a more capable o3-Pro model will be made available to Pro users “in a few weeks.”
OpenAI’s model naming can be quite confusing—especially if you’re trying to keep track of their best-ever models. Just a few days ago, Sam Altman acknowledged the issue in a post on X, writing, “How about we fix our model naming by this summer, and everyone gets a few more months to make fun of us (which we very much deserve) until then?” Judging by the names of the latest models, it seems we might indeed have to wait a bit longer for OpenAI for that fix.
OpenAI highlights that the o3 model is a powerful one capable of handling tasks across various domains, including coding, math, science, and visual reasoning. Similarly, o4-mini is a smart yet cost-efficient model with a significantly higher user limit than o3, offering “a strong high-volume, high-throughput option for everyone with questions that benefit from reasoning.”
“Thinking with Images” has been one of our core bets in Perception since the earliest o-series launch. We quietly shipped o1 vision as a glimpse—and now o3 and o4-mini bring it to life with real polish. Huge shoutout to our amazing team members, especially:
– @mckbrando, for… https://t.co/WzqoOl8EwW— Jiahui Yu (@jhyuxm) April 16, 2025
These are also the first two language models from OpenAI that can process uploaded images as part of their chain of thought — meaning they don’t just see an image, they think about it.
ChatGPT Plus and Pro users will get access to o3, o4-mini, and o4-mini-high starting today, replacing o1, o3-mini, and o3-mini-high. ChatGPT Enterprise and Edu users will gain access within a week. Developers can also access o3 and o4-mini via the Chat Completions API and the Responses API.
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