GitHub Accidentally Leaks GPT-5 Just Before OpenAI’s Official Reveal

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Key Takeaways:

GitHub leak exposes GPT-5 lineup early: A deleted blog post revealed four distinct GPT-5 models ahead of OpenAI’s official announcement.
GPT-5 improves reasoning and minimal-prompt tasks: OpenAI calls it their most capable model yet, with big jumps in logic, code, and natural interaction.
Four variants target different needs: gpt-5, gpt-5-mini, gpt-5-nano, and gpt-5-chat are optimized for logic, speed, latency, and enterprise dialogue respectively.
Launch likely timed for developer preview: The leak came just before OpenAI’s event, with signs the new models are already in early API access.
Access and model comparison still unclear: Pricing, free-tier support, and how GPT-5 stacks against Claude 3 or Llama 4 are still unanswered.

OpenAI has been teasing something big all week, and it looks like the surprise didn’t quite go as planned. Just hours before its official event, GitHub accidentally published a blog post revealing details about GPT-5, OpenAI’s next major AI model. The post was quickly deleted, but not before Reddit users spotted it, saved it, and started talking. One user even shared an archived version, making sure the leak lived on even after it was taken down.

The deleted GitHub blog confirmed what many had been speculating: GPT-5 is coming, and it’s not just one model. It’s a whole lineup of four, each tailored for a different use case. The post also called GPT-5 OpenAI’s “most advanced model” yet, promising major leaps in reasoning, code generation, and how the model interacts with users.

Here Are the Four GPT-5 Models GitHub Listed

Before it vanished, the blog post listed four variants of GPT-5:

gpt-5: The main model, designed for logic and multi-step problem solving.
gpt-5-mini: A lightweight version built for cheaper use and faster responses.
gpt-5-nano: Even smaller and optimized for low-latency tasks like real-time chat.
gpt-5-chat: A more conversational model for enterprise apps, with support for natural, multimodal, and highly context-aware dialogue.

The post said GPT-5 could “handle complex coding tasks with minimal prompting” and described its “enhanced agentic capabilities,” hinting that it may be smarter at taking initiative during tasks.

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The Timing Isn’t Random Either

The leak dropped just before OpenAI’s big reveal, which is scheduled for today at 10AM PT. And yes, the event teaser says “LIVE5TREAM”, with a big bold 5 right in the middle. Over the weekend, OpenAI CEO Sam Altman hinted that “something big” was coming. Now, we know what he meant.

Even before the GitHub post slipped out, some users had already spotted signs in OpenAI’s API docs. Icons for “gpt-5-mini” and “gpt-5-nano” quietly showed up, pointing to an upcoming launch. This leak has just made it official.

That said, we still don’t have all the answers. It’s unclear when these models will be available to everyone, or if free users will get access right away. And while GitHub briefly compared GPT-5 to Claude, Llama 4, and Cohere v2, we’ll have to wait and see how it actually stacks up.

One thing is certain: GPT-5 is real, and it’s arriving today. GitHub may have spoiled the surprise, but the countdown is still on. We’ll be watching the livestream and sharing all the updates as they roll in.

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