OpenAI rolls out GPT-5.4-Cyber, a fine-tuned GPT-5.4 variant for defensive cybersecurity use cases, to some participants of its Trusted Access for Cyber program
OpenAI is letting a select group of users access a new artificial intelligence model that's meant to be more adept …
Bloomberg Rachel Metz
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Discussion
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@openai
@openai
on x
We're expanding Trusted Access for Cyber with additional tiers for authenticated cybersecurity defenders. Customers in the highest tiers can request access to GPT-5.4-Cyber, a version of GPT-5.4 fine-tuned for cybersecurity use cases, enabling more advanced defensive workflows.
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@miles_brundage
Miles Brundage
on x
I'm sure some people will make a lot of hay out of the distinction between this and Mythos but in the big scheme of things, these are similar philosophies - https://x.com/... [image]
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@nrehiew_
@nrehiew_
on x
This is quite different from Mythos and is nowhere near as interesting imo This is a fine-tuned version of GPT-5.4 specifically for cybersecurity. Mythos was never explicitly trained for this purpose, and its capabilities naturally emerged
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@openai
@openai
on x
For years, we've been building our cyber defense program on the principles of democratized access, iterative deployment, and ecosystem resilience. As model capabilities advance, our approach is to scale cyber defense in lockstep: broadening access for legitimate defenders while …
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@andrewcurran_
Andrew Curran
on x
New model: GPT-5.4-Cyber 'Today we're expanding this program by introducing additional tiers of access for users willing to work with OpenAI to authenticate themselves as cybersecurity defenders. Customers in the highest tiers will get access to GPT-5.4-Cyber, a model purposely …
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@alph4betsoup
@alph4betsoup
on x
“we're expanding this program by introducing additional tiers of access for users willing to work with OpenAI to authenticate themselves as cybersecurity defenders” [image]
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@morqon
Morgan
on x
“our goal is to make these tools as widely available as possible while preventing misuse. we design mechanisms which avoid arbitrarily deciding who gets access for legitimate use and who doesn't” 👀
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@robtlee
Rob T. Lee
on x
So @OpenAI basically took its latest model (not even a Frontier one) and re-released it after effectively removing guardrails. They are likely trying to enhance researchers' ability to find code vulnerabilities. But neither OpenAI nor @AnthropicAI is telling the cybersecurity
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@zauthinc
@zauthinc
on x
AI will be used maliciously against your product. We've built what you need to stay safe. An agentic pentest using the best models, prompts, and dataset to ensure your app has no vulnerabilities. For $20, you get the same value that companies STILL charge thousands for.
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@mattshumer_
Matt Shumer
on x
OpenAI fine-tuned GPT-5.4 for cybersecurity, with fewer refusals, new capabilities like binary reverse engineering, and is rolling it out to verified defenders. Very different approach than Anthropic is taking with Mythos. We'll see how each plays out! [image]
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@hesamation
@hesamation
on x
OpenAI is preparing for the launch of Mythos by testing GPT-5.4-Cyber, a fine-tuned version of GPT-5.4. internet will be so interesting in the next couple of years. [video]
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@chatgpt21
Chris
on x
🚨OpenAI just dropped GPT-5.4-Cyber! a more cyber-permissive GPT-5.4 for trusted defenders, with lower refusal boundaries for legitimate security work and support for things like binary reverse engineering. The new rollout model they'll be implementing from now on: first they sca…
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@fouadmatin
Fouad
on x
Excited to scale Trusted Access for Cyber! There's no magic in cybersecurity, just teamwork.
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@paulsolt
Paul Solt
on x
OpenAI shipped GPT-5.4-Cyber. A model built to find and fix software exploits. More capable than Mythos... and available today. 1. Binary scanning. Agents can find exploits in compiled apps... no source code required. That's a new attack surface. 2. Prompt Refusals are lower.
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@blackroomsec
@blackroomsec
on x
We're doing this. Hoist those colors! Yo ho, me hearties! Yo. Ho.
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@0xocdsec
@0xocdsec
on x
Let's burn more 0 days I guess [image]
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@seldo.com
Laurie Voss
on bluesky
Only 90s kids will understand why the fact that the official government term for cybersecurity is “cyber” is deeply embarrassing. https://www.bloomberg.com/news/ articles/2026-04-14/openai-releases- cyber-model-to-limited-group-in-race- with-mythos
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r/singularity
r
on reddit
OpenAI Releases Cyber Model to Limited Group in Race With Mythos
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Kevin Hiltpold, CISSP
Kevin Hiltpold, CISSP
on linkedin
It's official (didn't take too long), we are no longer just debating cyber capability. — We are watching a market contest over whose AI gets to define the threat model and sell the response. …