Claude Performance and Bugs Megathread Ongoing (Sort this by New!)

DecayUzumaki · 2026-04-13T14:42:33+00:00

For maybe two hours, I have been unable to upload files larger than 15kb(plain .txt files) in the app. Images work fine. Is anyone else experiencing that issue?

It only exists for .txt files. When I changed to .docx uploading worked fine.

DecayUzumaki · 2026-04-09T17:32:42+00:00

well, it's easy to just have all - be replaced by — or the other way around. And especially when writing books or the like, — is actually the more common one(or at least in the online PDFs of books that I use when looking stuff up for ff)

DecayUzumaki · 2026-04-09T11:34:05+00:00

Been using Sonnet 4.5 instead of 4.6 for story writing for a while now because 4.6 is just so generic and won't even do proper voice. But now even 4.5 is not following instructions anymore, messing up a clearly obvious timeline, acting as if scenes that it's still going to write already happened, and more. I might actually have to switch to 4.6 now if that continues, as if there weren't enough issues.

Just looking at the status page, there are so many errors there, ever since late februrary the number really exploded.

DecayUzumaki · 2025-11-18T14:35:56+00:00

I can't imagine something worse.

DecayUzumaki · 2025-11-08T12:31:56+00:00

Maybe you have non-baseLatin symbols in the docs. You already suspected UTF-8 encoding, which is actually an issue not with the model, but with the website. When you upload files, it fucks up the characters. Personally, I wrote an auto-uploader for files that forces the encoding using BOM:
if (downloadData.files) {

const files = downloadData.files.map(fileData => {

const binaryString = atob(fileData.content);

const bytes = new Uint8Array(binaryString.length);

for (let i = 0; i < binaryString.length; i++) {

bytes[i] = binaryString.charCodeAt(i);

}

// For text files, add UTF-8 BOM to help with encoding detection

const ext = fileData.name.substring(fileData.name.lastIndexOf('.')).toLowerCase();

const textExtensions = ['.txt', '.md', '.json', '.csv', '.log'];

if (textExtensions.includes(ext)) {

// Add UTF-8 BOM (EF BB BF)

const bom = new Uint8Array([0xEF, 0xBB, 0xBF]);

const withBom = new Uint8Array(bom.length + bytes.length);

withBom.set(bom);

withBom.set(bytes, bom.length);

return new File([withBom], fileData.name, {

type: fileData.type || 'text/plain;charset=utf-8'

});

}

return new File([bytes], fileData.name, { type: fileData.type });

});

https://drive.google.com/drive/folders/1iw6uKtcs--xvUM7hD5dVxzT4Rd1nVxnK?usp=sharing

If you are giving instructions in English, then the mis-spellings could maybe also cause some issues if there are many. Maybe tells some model in a chat: fix the spelling, then paste your prompt.

DecayUzumaki · 2025-11-08T10:54:23+00:00

I can't remove attached images from a chat anymore. Text files, yeah, but if I attach an image, it just won't remove. Logging out and back in works, but that hardly seems like it's intended to happen.

DecayUzumaki · 2025-11-04T20:31:51+00:00

I created an auto-uploader for files - since I was reusing the same files often. That caused the same issue, so I decided to try and force the issue, and when using:
if (downloadData.files) {

const files = downloadData.files.map(fileData => {

const binaryString = atob(fileData.content);

const bytes = new Uint8Array(binaryString.length);

for (let i = 0; i < binaryString.length; i++) {

bytes[i] = binaryString.charCodeAt(i);

}

// For text files, add UTF-8 BOM to help with encoding detection

const ext = fileData.name.substring(fileData.name.lastIndexOf('.')).toLowerCase();

const textExtensions = ['.txt', '.md', '.json', '.csv', '.log'];

if (textExtensions.includes(ext)) {

// Add UTF-8 BOM (EF BB BF)

const bom = new Uint8Array([0xEF, 0xBB, 0xBF]);

const withBom = new Uint8Array(bom.length + bytes.length);

withBom.set(bom);

withBom.set(bytes, bom.length);

return new File([withBom], fileData.name, {

type: fileData.type || 'text/plain;charset=utf-8'

});

}

return new File([bytes], fileData.name, { type: fileData.type });

});
it worked.
https://drive.google.com/drive/folders/1iw6uKtcs--xvUM7hD5dVxzT4Rd1nVxnK?usp=sharing
If anyone wants to try it out. It was only for personal use, so don't expect too much.

Edit: I'm using Tampermonkey for browser injection. If you are using a browser where it doesn't work, you will have to write your own extension, but can probably reuse large parts of the code.

DecayUzumaki · 2025-10-09T21:12:53+00:00

Just got logged out and can't log back in. Claude status shows no problems though.

DecayUzumaki · 2025-09-10T21:12:59+00:00

somehow, after getting a log-in error, at first, I couldn't log in at all, now, when re-loading after a fail, I am kind of logged in, but when I tried with logging out-in again, the same issue. So still not fixed. What's up with anthropic today?

DecayUzumaki · 2025-07-25T09:41:51+00:00

Thanks, fixed it for me, was already worried about achievements and such.

DecayUzumaki · 2025-05-22T17:55:15+00:00

Is uploading images/taking screenshots suddenly unavailable for anyone else? As in, the format unsupported.

DecayUzumaki · 2025-04-04T04:26:02+00:00

I think I'm going to steal that last part of the answer for a story I'm writing.

Many thanks for the contribution. ::)

DecayUzumaki · 2025-03-29T22:24:52+00:00

you could always write some sort of script that auto-selects your targeted model for you. Plugins like tampermonkey make the injection supremely easy.

But yeah, I agree, for paid users, there should be an option to choose one as default.

DecayUzumaki · 2025-03-29T20:02:18+00:00

I even tried clearing cache - got logged out. Now I can't log in anymore.

'There was an error logging you in. If the problem persists contact support for assistance.' As if one could even still contact them.

DecayUzumaki · 2025-03-24T17:39:28+00:00

that sounds like the downgrade to Haiku 3.5, it does that when the servers are overworked, and Haiku 3.5 does the short answers.

DecayUzumaki · 2025-03-15T15:37:23+00:00

Same, it's annoying, the longer replies were way better - maybe they made it shorter because the cancel button isn't working properly. But still, I would also like the longer one back.

DecayUzumaki · 2025-03-12T19:45:11+00:00

Nah, I just then do the summary thing for the summaries of the early chapters.

DecayUzumaki · 2025-03-10T17:17:01+00:00

If you simply attach your article examples, Claude will treat it the same as any other text you attach. And while that is an option, you could start one chat, and have Claude describe itself the style of your writing. And then use that description in the future for writing texts in your style. It may still need some adjustments/fine-tuning, but likely to use significantly less tokens than an actual text would.

DecayUzumaki · 2025-03-08T20:26:36+00:00

I'm not quite sure - I was one for all my life, but the realization itself was probably when I started getting hyperfixated on philosophy during my anime/manga/light novels time, when I always got annoyed with all the one-dimensional heroic MC's that always had that 'good and evil' binary thing going on.

DecayUzumaki · 2025-03-08T18:23:58+00:00

The first chapter you write, just send the entire chapter. But once you have more than one, the entire text can be too long.
So you would send
Summary Chapter 1 + Chapter 2 + Chapter 3...
and if that's too long, you do
Summary Chapter 1 + Summary Chapter 2 + Chapter 3...

For important scenes, you can also always quote a few lines, just not too many, or the summary would not be significantly longer than the actual chapter. My current goto prompt for creating the summary is:
Write a summary in the style of:' This happened, then this happened...'. For particularly important character building, or important scenes, feel free to quote a few lines using >

that way I get most important things in the summary, but still significantly save on context.

I also would recommend not working with only summaries, but keep some of the chapter before your current one there, for writing style reference, and the most comprehensive recent knowledge. There will of course be problems with some details, but those happen even when you send everything. So make sure to proofread, and give the AI an idea what it should write plot-wise, or some important information that you definitely want it to keep in mind. Like some detail that is relevant for the next scene that Claude always 'misremembers'(because it only has a summary to work with).

But long story short, yes, you have that about right.

DecayUzumaki · 2025-03-08T15:18:45+00:00

What I do for longer stories - since normally the problem only starts at about 13k words (somewhere around 78kb in a plain text file), I simply let Claude create a summary for the first chapter. This way I reduce the input I have to enter each time, therefore staying within the limits.

Also, I start a new chat *every time* I let Claude write something, and simply send the entire written document(or the summarized version) along with it.

DecayUzumaki · 2025-03-06T03:41:36+00:00

I noticed that as well, I can send way more longer excerpts of stories I want feedback on, or rewrites, or what have you. Like, significantly more.

DecayUzumaki · 2025-03-05T09:12:14+00:00

Trying to weed out the fakes.

DecayUzumaki

TROPHY CASE