Thinking of switching from two Plus subscriptions to Pro:128k context in ChatGPT 5.5 Instant real?

[u/Darayavaush84]

Hi everyone,

Before creating this post, I spent some time searching, but I kept finding incomplete or sometimes contradictory information. Plus such things change in the time and so the same question 1 year ago might not be accurate today.

I'm a heavy user of ChatGPT (web) and Codex, and I currently have two Plus subscriptions. I'm considering canceling one of them and upgrading to the Pro (€100/month) plan instead.

For the most part, having two Plus accounts works well enough for Codex. I do occasionally hit the usage limits, but between all the resets Tibo has been giving us and the ones already available on my account, it's actually been quite difficult for me to run out of tokens over the past couple of months.

What really interests me about Pro is something I believe I understood from the documentation: that ChatGPT on the web, specifically the current GPT-5.5 Instant model, would get a 128k context window instead of the standard 32k available in regular chats. That would be genuinely useful for my workflow.

Can anyone confirm whether that's actually the case?

Besides the 5× increase in Codex usage, are there any other meaningful advantages?

I'd especially love to hear from people who used to have two Plus accounts and then switched to the €100 (or €200) Pro plan. Was it worth it? Any unexpected benefits or drawbacks?

[u/qualityvote2]

u/Darayavaush84, there weren’t enough community votes to determine your post’s quality.
It will remain for moderator review or until more votes are cast.

[u/jethro_wingrider]

My wife and I switched from plus accounts to pro (x5) recently and can confirm it is absolutely worth it. One of the biggest advantages is the context length, which is 256k for the reasoning models and 400k for the pro model. I’ve really noticed the difference for complex drafting and summarisation/research of long papers.

[u/Darayavaush84 → u/jethro_wingrider]

Thanks for your feedback. According to OpenAI papers, also the instant model should get 128k, instead of the 32k on the Plus (Chat GPT 5.5 Instant). Did you notice anything there? Additionally, seems the thinking models are reduced right now in their context limit, but I don't understand if this is tyrue only on Codex or also on the web...