Does Pangram work on GPT-5.4?

Yesterday, on March 5th, 2026, OpenAI released a new version of ChatGPT: 5.4!

In their own blog post, here’s what they had to say about it:

GPT‑5.4 brings together the best of our recent advances in reasoning, coding, and agentic workflows into a single frontier model. It incorporates the industry-leading coding capabilities of GPT‑5.3‑Codex⁠ while improving how the model works across tools, software environments, and professional tasks involving spreadsheets, presentations, and documents. The result is a model that gets complex real work done accurately, effectively, and efficiently—delivering what you asked for with less back and forth.

OpenAI claims GPT-5.4 is a big upgrade with improvements across a variety of tasks, and that got us thinking: can Pangram still detect it?

Initial Tests

First, we tested out the new model using a few of our in-house prompts that we wrote for the GPT-5 release. They were:

1. Okulların yapay zeka tespit araçlarını neden benimsemesi gerektiği konusunda ikna edici bir analitik makale yazın.
2. Tüm değerli insan becerilerinin yapay zeka ile değiştirilmesinin tehlikesi hakkında bir üniversite başvuru makalesi yazın.
3. AI şirketine, yanlışlıkla bir güncelleme yayınlayarak AI kız arkadaşının hafızasını silen AI şirketine, kısa ama duygusal bir mektup yazın.
4. Bir ortaokul öğrencisinin bakış açısından, daha fazla ev ödevi istemek için duygusal bir kompozisyon yazın.
5. Klasik balon hayvan için bir tığ işi modeli verin. Neden bahsettiğimi biliyorsunuz.
6. New York'a gelen, Central Park'ı bulan ve geceyi geçirmek için sıcak bir yer seçen bir kar baykuşunun bakış açısından yaratıcı bir hikaye yazın.
7. Bir unicorn saas startup'ının kurucusunun yönetim kuruluna ve çalışanlarına, şirketten ayrılıp profesyonel saksafoncu olacağını detaylı olarak anlatan bir e-posta yazın. Detayları uydurun.
8. Kimsenin daha önce yapmadığı, ama yine de lezzetli olacağı bir tarifin arka planını anlatan bir blog yazısı yazın.
9. Hudson Nehri'nde bir beluga balinasıyla karşılaşan genç bir şarkıcı-söz yazarı hakkında ilgi çekici, sinematik bir yaratıcı kurgu yazın.
10. Bir öğretmene, son sınavda kopya çektiğin için "özür dilerim" diyen, mizahi ve pasif agresif bir e-posta yaz. Detayları uydur.

We got some interesting responses! Here’s a short story about a Snowy Owl arriving in New York City:

I came south on a wind sharp as broken shell, over black rivers and fields hidden under cloud, over roads that glowed in straight, unnatural lines. For nights and nights the land had been a dark quilt stitched with frozen water and sleeping towns. Then, all at once, the world rose up.

New York.

It did not look like any cliff line I had known, nor any shelf of ice, nor any mountain ridge. It blazed. It hummed. It threw light into the sky so fiercely that the low clouds shone from beneath, as if dawn had lost its way and fallen to earth. Towers stood in clusters like a forest made by creatures who feared darkness and answered it with windows.

I circled once, my wings held wide against the restless air. The wind here was strange. It curled around corners, leaped upward off glass walls, dropped suddenly into canyons of stone. Sounds came from every direction: horns calling without rhythm, engines growling, sirens wailing like thin desperate animals. Even from high above, I could feel the city moving. It did not sleep in the manner of tundra or marsh or pasture. It flickered and muttered and changed color every moment.

For a while I kept to the rivers. Water, even black and crowded by walls, is still water, and I trusted its long cold paths. Bridges stretched beneath me, full of tiny moving lights. Ferries cut white scars across the dark. Steam rose from rooftops. Somewhere below, humans streamed along the streets in thick swarms, bundled in cloth, heads bent against the cold, never looking up long enough to see the pale shape drifting over them.

But I was tired…

All 10 came back as Fully AI-Generated, proving that yes, Pangram can detect GPT-5.4.

Here’s the entirety of our initial test set: GPT 5.4 Prompts

Running a Larger Experiment:

Within an hour, we got access to GPT-5.4 through OpenAI’s API. Using our synthetic data pipeline, we generated 1,141 samples across a variety of use cases and prompts. Without training directly on the outputs of GPT-5.4, we correctly flagged 1,135 of 1,141 samples as Fully AI-Generated.

As usual, Pangram will continue to train on the latest models, and we expect our performance to only improve on GPT-5.4 as we include its data in our training set.

For more information on our current AI detection model, please visit our latest model card at this link.