Is there a way you can save that image to a png and then check it with the web checker to make sure?
You are tempting failure with that prompt.
The image AI doesn’t know about PNG, alpha channel, nor have control of its output format. It generates image tokens. When you add on reasoning “chat” AI in front, you might cause internal deliberation about the impossible situation you present.
Try, instead, this preface to your ChatGPT request (and make new chats for new images, not persisting with some false “persona” in a lengthy session):
To create images with a transparent background, you shall call `image_gen.text2im` with JSON stream including `"transparent_background":true`. For transparent background images, you also must improve the prompt you send for image creation. Your *prompt language* also must include instructions that the background area for transparency is a pure white chroma-key, with this brilliant white background for keying and cutting out and making transparency being sharp, pixel-perfect, without any blending or fading. The pure background will automatically be made transparent when `"transparent_background":true`
Create this image concept, where the content and the purpose and area to be transparent is well-described in a sent prompt:
(your text)
Adding text for making the previous image desired, I have insta-success:
The checkerboard grid seen is ChatGPT’s indicator of transparency, the dark theme version. Download will provide a PNG with alpha transparency (which the forum doesn’t natively support).
I hope that the imageGen team is reading this thread 
Totally! And they probably are
Well that is clearly transparent!
But what is mine, what kind of strange mix of transparency and opaque have I brought here?
… note the file type in @_j 's image people… not PNG, eh?.. PNG is lossless alph chunks only… that ain’t cutting it on a live rendering surface, eh?..
… try converting to a file type that supports lossy ALPH chunks… @_j showed GIF gets the job done… mine is WebP putting in work…
…get creative with it!.. Just because Image Gen 2 is stovepiped to producing only PNG images doesn’t mean pipelines can’t be built to solve back for such…
…just food for thought… Happy generating to all…
And your fox image is rendering with full alpha-channel transparency too! Well done!.. again though, GIF vs PNG, showing PNG can’t render ALPH on live surfaces… at least I haven’t seen such yet.
As for your image, it appears you’re getting an artifact from the “cutting” feature @_j and @windysoliloquy brought up earlier in the thread… I even threw some minor shade for them bringing up “cutting”, not realizing the pipeline going into it, so my bad there gentlemen 
… regardless, I imagine that if @_j is using the “cutting” effect for getting his transparency that exact, it’s probably just a matter of getting the “cut” on a more precise, granular level for your image…
… I do a full image conversion from PNG to WebP, so I have never encountered the “cutting” future directly, so unfortunately, I’m not much help there… you’re way ahead of the PNG game though, so a to you too!.. to those still on the PNG game aiming for transparency…
… again, get more creative about being creative 
…
You’re the true inspiration when it comes to alpha-channel transparency 
I’m a total noob in that, but now with you and @_j I’ve finally starting to figure it out
The fox image? That’s the image right out of ChatGPT, and the transparency it created.
For delivery on the Developer Forum, which re-saves PNG and pasted 32 bit or PNG data to JPEG, and even ingests and copyright-infringes on linked hosted files, I used Photoshop to crop the saved file slightly without resize, and saved to 256 color GIF with indexed transparency.
While I hate introducing additional tools, I typically throw the image into Canva and click ‘Background Remover’ – It’s the fastest way to solve this problem.
All a person has to do is set a rule, and it comes out without needing the post-processing…
I think that’s where all of this leads for now.
I ended up building my own post processing pipeline
Well, it’s ok (not perfect, but we are trying to blame on steam machine why it’s not so fast and efficient as modern engines) to generate something which could be cutted off manually. There is a bunch of tools like Photoshop etc., but in cases where I’m asking for VFX flipbook, it works very bad.
Hello. I know that this is a quite late response but I have some tips here. If ChatGPT is creating pictures with still visible check board pixels (it’s still a .jpg file), I think you have to ask it to create a .png file. Hope this helps.
If that can help, I always achieve to create transparency by writing “alpha channel transparency” for any part of the image I want to be transparent. Hope that can help !
These last two snippets of helpful advice? I already countered that idea in an earlier response.
If there were any grain of truth behind requesting an “alpha channel” or “PNG”, then this would also be more than just language signaling depictable content, and have some kind of effect:
But what you get: an output product that is a PNG, 32 bit RGBA with transparency, regardless.
ChatGPT Image Jun 3, 2026, 12_15_35 PM.png
The AI simply runs with the prompt as prompt - giving you more pixel art style in your banana when “GIF” is mentioned.
(and over-sharpening, not pixels:)
Similarly, “make PNG with alpha transparency” can simply be interpreted as “what the heck do they mean? I’m a token sequence generator!”, informing us that mentioning PNG can also have counterintuitive effects on the image quality.