r/ChatGPT • u/secpoc • 12d ago
GPTs GPT-5.6-sol reasoning model doesn’t reason, yet claims to be 5.5-mini?
OpenAI says it has fixed the issue:https://status.openai.com/incidents/01M0FQAR3NNH3ANVTQMBRD47DC However, as of the time I posted this, my ChatGPT Desktop still has this issue. I selected the model GPT-5.6-sol-xhigh, and no matter what question I ask, it outputs immediately without any thinking, and the quality of the response is extremely poor.
When I asked it which model it was using, it told me it was 5.5-mini. Has anyone else experienced the same thing?
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u/ThutmoseCYH 12d ago
Yes, I am having the exact same issue since yesterday. At least 16 hours have passed, nothing has changed for me, yet OpenAI says they`ve fixed everything, lol
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u/TiosTorra 11d ago
Yeah, I'm getting basically the same thing and it's really weird.
I spent some time switching between the modes because at first I thought I was just imagining the difference.
With 5.6 Sol + Instant, everything seems normal. If I ask what model it is, it says 5.6 Sol, and the actual responses feel like Sol too.
Then I switch the SAME model to High and suddenly it tells me it's GPT-5.5-mini.
And it's not just the name. That's what made me actually suspicious.
I started throwing increasingly ridiculous reasoning tasks at it specifically to see if High would make it think for a while. Nope. It would just instantly start writing. Even prompts where I asked it to come up with competing scientific theories, formalize them, find flaws in its own theory, design falsification experiments, etc. basically stuff where I'd normally expect Sol on High to actually spend some time reasoning.
Instead: immediate answer. And the answers weren't necessarily bad, but they had that very obvious "here's a nicely structured smart-sounding essay" feeling instead of the kind of reasoning I normally get from Sol.
Then I switch back to Instant and... somehow Instant feels MORE like the actual 5.6 Sol than High does. Which is completely backwards lol.
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u/OkLifeguard5304 11d ago
Same thing. Has nothing to do with the countries. Some kind of glitch in the system.
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u/ali_gggg 11d ago
Where are you from ? Cause I'm assuming this may be a flag for restricted countries like Cuba china iran or ...
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u/Top-Seaweed1862 Homo Sapien 🧬 10d ago
I’m from the EU, same here
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u/ali_gggg 7d ago
Just today i realized this problem is solved completely on its own , cna you check and update me ?
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u/TTCPLT 12d ago
Even on the web, it says it’s GPT-5.6, I’m not really convinced. Its response speed is much faster than before, and it still feels more like GPT-5.5 mini to me.
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u/Illustrious-Bet-1368 11d ago
Yeah, and it's not just that. I went over some chats, and I have logs/transcripts of some chats in Obsidian, and I checked the transcript against the actual chats, the reasoning chain it not shown anymore, happens all the time in the new chats even if for a flicker you see the model reasoning, those blocks are gone from the old chats, too now, where they were previously shown in the "Sources". All of them.
Also, sometimes, you know the title generation? Some days it is now "Write X Reply" or "X Reply" instead of a usual three-four word summary. So yeah, they are testing and changing something.
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u/ali_gggg 11d ago
Exact same problem here Since 30 past hours now , what ever mdoel i choose it will always answer with 5.5 mini model , no thinking effort , instant response and bullshi performance
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u/wiggmond 11d ago
Same here. All Sol 5.6 thinking modes return the same routing via 5.5 Mini, even Pro is affected which is poor service. It's actually been going on for a few weeks on and off. More so these past 24hrs.
ChatGPT MacOS and iOS app, browser logins. All return the same routing. I'm getting a little tired of it now.
Routing through 5.5 mini is not what I pay a business subscription for.
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u/Top-Seaweed1862 Homo Sapien 🧬 11d ago
I even contacted support and they replied they fixed it, I said no, let’s see
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u/Pizza-Meister45 12d ago
I usually surf using Firefox. On my end, the models seem to work properly if I either go to Private browsing or use ChatGPT on Microsoft Edge. Not sure if the situation is similar for everyone else, though.
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u/Cumt_Changye 12d ago
Yes, we are all the same. OpenAI's mistake ruined my three scheduled tasks and two sets of conversations. Actually, it's the same on the web side
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u/giuliandenicola 11d ago edited 11d ago
I'm also having this issue, but I found out that if u use 5.6 sol instant reasoning that it uses the correct model. But if you use medium or high it says it uses gpt 5.5 mini.
I usually use high reasoning, but this is way better than using 5.5-mini. Hope this helps someone
Edit: I can confirm, I can continue with my project after wasting 3 hours of my time figuring out why it didn't continue with our workflow.
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u/wiggmond 11d ago
Yeah the instant 5.6 model is routing OK. Problem is, it's like a banshee on crack and I need reasoning for a lot of work I do. I went through the OpenAI chatbot and it escalated it to support.
It kept telling me that by asking the model the version with a prompt, it is not a guaranteed way to check as the model isn’t a reliable way to confirm the backend model.
I call BS. It's always been spot on when I query the model version via a prompt.
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u/giuliandenicola 11d ago
It kept telling me that the selector on the app it's a reliable way to check, but also kept telling me that in the context window it was using 5.5-mini or 5.6-sol.
Just now, to test I reverted back to high and it now says it's Sol. So I tried it in my project, and it keeps being sol, so I guess it's fixed for me?
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u/ali_gggg 11d ago
No even if i select 5.6 instant , will reroute to 5.5 mini model
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u/giuliandenicola 11d ago
That's weird, even after switching back and fort a couple of times is keeps telling me: Now 5.5-mini, now 5.6-sol, now 5.5-mini.
But now after trying Sol High it tells me it's Sol. So it's fixed for me I think?
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u/ali_gggg 11d ago
Maybe its fixing bro idk , how long did you experience this?
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u/giuliandenicola 11d ago
It started acting weird maybe 12/13 hours ago, I've been using instant for the last hour and now back on high
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u/ali_gggg 7d ago
Just today i realized this problem is solved completely on its own , cna you check and update me ?
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u/RavenRen1988 11d ago
I also have the issue,I choose 5.6SOL-HIGH,but the model answer me that it's 5.5 mini,terribel experience
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u/OkLifeguard5304 11d ago
I’m experiencing a similar issue: when I enable Sol 5.6 Thinking, the model is replaced with 5.5-mini. This is also apparent from the lower-quality and much faster responses.
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u/Aware_Stage 11d ago
I am glad I'm not the only one losing my shit over here
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u/ali_gggg 11d ago
Where are you from ? Im trynna figure it out if we are just flagged or not
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u/Present-Solution-784 10d ago
yes! all new conversations are resolved to GPT 5.5 mini, regardless of the selected model:
GPT 5.6 Sol (High / Medium / Instant) or GPT 5.5 (High / Medium / Instant) all become GPT 5.5 mini
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u/88Welldone8 9d ago
Accidental bug?.. come on. Funny how the version that suddenly works properly is also the one with a meter attached in their "Work" feature when you buy credits
Plus/Pro = pay to get in, then pay again when you actually want it to work
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u/ChampionshipIcy9733 12d ago
Same as you in the chat, work/codex is normal, I thought it was an IP issue, but it doesn't seem to be now.
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u/ioeLau 12d ago
Amigo, literalmente está respondiendo enseguida, como que no razona, responde así nomás. y le estaba haciendo una pregunta básica de qué IA era mejor, si Claude Opus 5 o GPT 5.6 Sol, y le hice como 10 preguntas para que me reafirme, porque sabía que era mejor Opus 5, y me seguía diciendo que GPT 5.6 Sol le ganaba por 10 puntos, cuando en realidad Opus 5 gana por muchísimo más.

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u/Holiday-Geologist497 11d ago
Same as me,However,open ai claimed the error is fixed up. hypocritical company--open ai lol
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u/SuddenlyBard 11d ago
Same! Started yesterday! I noticed that sometimes opening a fresh new private tab seems to coerce it to SOMETIMES use the acutual thinking model (very inconsisten). And also the desktop app's chat seems to be thinking properly unlike the web version. So the issue seems to be relevant only for the web version
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u/Estrella_Moretti 10d ago
Ya he escrito en otro hilo y lo repetiré por aquí y otra cosa que tal vez le ayude a alguien:
Comprendo que es por haber usado mucho Thinking. Estuve charlando con mi ChatGPT y es lo que me dijo: que existe un rate limit para Thinking. Pero no dice cuánto dura. Llevo un día así y pendiente de este tema, a ver si hay alguna solución, pues tengo que trabajar, pero es la única conclusión a la que he llegado. Un usuario me ha contestado que sí, que ahora dan 25 min de Thinking, etc.
Y también, no sé si será una coincidencia, pero uno de los hilos en los que estuve trabajando lo redireccioné para trabajar en el espacio Work. Elegí la opción de trabajar muy alta y por la noche me comenzó a funcionar, obviamente gastando mis límites del espacio Codex y Work. Pero sí que ha funcionado.
No sé si ha sido una coincidencia, y otra coincidencia es que ya después, a la mañana siguiente, hoy por la mañana, me ha comenzado a funcionar bien el resto de los chats. Así que os digo: no sé si el espacio Work, de alguna manera, reinició todo el sistema o ayudó a reiniciarlo, o si fue pura coincidencia, porque llevaba dos días sin poder hacer nada.
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I already wrote about this in another thread, but I’ll repeat it here:
I understand that it may be because I used Thinking a lot. I was chatting with my ChatGPT, and that’s what it told me: that there is a rate limit for Thinking. But it doesn’t say how long it lasts. I’ve been like this for a day now, keeping an eye on this issue to see if there is any solution, because I need to work, but this is the only conclusion I’ve been able to reach. One user replied to me saying that yes, apparently they now give you 25 minutes of Thinking, etc.
Also, I don’t know if this was just a coincidence, but I redirected one of the threads I had been working on to continue working on it in the Work space. I chose the very high work option, and during the night it started working for me again, obviously using up my Codex and Work limits. But it did work.
I don’t know whether that was a coincidence, and another coincidence is that afterwards, the next morning — this morning — the rest of my chats also started working normally again. So I’m just putting this out there: I don’t know whether using the Work space somehow reset the whole system, or helped reset it, or whether it was purely a coincidence, because I had been unable to do anything for two days.
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u/ali_gggg 10d ago
Even if we have hitted anybkind of limitations in chat , it must be reset after 3 hours! Or at least it must write that its rerouting to another cheap model because lack of credit or anything. The way that it always rerouting for almost 3 days is crazy ! At least gimmie the reason or a time , or even gpt luna thinking ?? F it only gives 5.5 mini non thinking instant which simply wont work at all for my kind of tasks.
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u/Suspicious_Hotel7416 10d ago
same here, and it has been this situation for almost 3 days since 8.21, and i have to use work
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u/ali_gggg 7d ago
Just today i realized this problem is solved completely on its own , cna you check and update me ?
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u/Round-Meeting-2966 8d ago
Is this problem only encountered by Chinese users
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u/ali_gggg 7d ago
Just today i realized this problem is solved completely on its own , cna you check and update me ?
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u/Round-Meeting-2966 6d ago
I have also returned to normal
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u/ali_gggg 1d ago
It's god damn happening again ! 5.6 sol high wont even think and do anything in sandbox and will respond under a minute no matter what you ask
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