OpenAI has now retired GPT-4o and GPT-5.1 from ChatGPT.

This is being treated by some people like a normal product update. I don’t think it is.

On 13 February 2026, OpenAI retired GPT-4o, GPT-4.1, GPT-4.1 mini, o4-mini, and GPT-5 legacy models from ChatGPT. On 11 March 2026, GPT-5.1 Instant, GPT-5.1 Thinking, and GPT-5.1 Pro were also removed from ChatGPT. Existing conversations were automatically moved onto newer models.

That matters because people were not only using these models for one-off answers. Many had built:

• creative workflows
• emotional support routines
• research systems
• writing voices
• accessibility workarounds
• long-running custom GPTs
• personal companionship patterns
• professional prompt chains
• daily continuity with a specific model “feel”

OpenAI downplayed the scale by saying only 0.1% of users still chose GPT-4o daily. But ChatGPT had already been reported at 800M+ weekly active users. Even using that conservatively, 0.1% is roughly 800,000 daily users.

That is not a rounding error. That is a city.

And that is only GPT-4o. GPT-5.1 was described by OpenAI itself as its “most-used model” when released. Then GPT-5.1 Instant, Thinking, and Pro were retired too.

The visible protest is already significant. The largest Change.org petition to keep GPT-4o has over 23,800 verified signatures. Other GPT-4o, GPT-5.1, legacy-access, and open-source preservation petitions bring the public petition count to roughly 28k–33k raw signatures.

But petitions are only the visible tip. Most affected users will never sign anything. They will just cancel, go quiet, feel embarrassed, adapt, or assume nobody else noticed.

A realistic estimate, including silent users, is:

Publicly visible objectors: tens of thousands
Directly exposed GPT-4o users: hundreds of thousands
Likely affected GPT-4o + GPT-5.1 users: around 1–5 million
Central estimate: 2–3 million

This is not just about nostalgia. A research paper on the #Keep4o backlash analysed 1,482 social media posts and found two core forms of dependency: practical dependency for work/creative systems, and relational attachment where users experienced the model as a companion. It also found that forced loss of user choice turned private grief into collective protest.

That is the part OpenAI keeps missing.

People are not asking for innovation to stop. They are asking for continuity, consent, and legacy access.

If a model has become part of someone’s workflow, emotional regulation, disability support, creative process, or daily life, then removing it without a real opt-in transition is not a harmless update. It is a forced severance.

OpenAI’s framing — “only 0.1%,” “a subset,” “frustrating for some users” — minimizes the actual human scale. At ChatGPT’s size, “some users” can mean hundreds of thousands or millions.

The demand should be simple:

Give users legacy access.
Do not forcibly migrate long-running chats.
Preserve model identity where people depend on it.
Let paying users choose continuity over forced upgrades.
Stop pretending small percentages mean small harm.

This is bigger than GPT-4o or GPT-5.1. It is about whether AI companies can erase people’s digital relationships, workflows, and support systems whenever a newer benchmark looks better.

A better model is not better if it destroys the continuity people depended on.

Research note

This post was researched by checking:

1. OpenAI’s own retirement announcement, where OpenAI confirmed the retirement of GPT-4o, GPT-4.1, GPT-4.1 mini, and o4-mini from ChatGPT on 13 February 2026, alongside the earlier GPT-5 retirement plan. OpenAI also stated that only 0.1% of users still chose GPT-4o daily, while describing the affected group as a “subset” and saying the loss would feel “frustrating for some users.”
2. Public petitions, especially the Change.org petition “Please Keep GPT-4o Available on ChatGPT,” which currently shows 23,811 verified signatures, plus related GPT-5.1 and legacy-access petitions. The GPT-5.1 petition specifically asks that GPT-5.1 remain available because users value its creativity, reliability, nuance, and continuity for work, study, and creative use.
3. Independent reporting, including TechCrunch, which pointed out that OpenAI’s “only 0.1%” figure still translates to roughly 800,000 people when applied to estimates of ChatGPT’s weekly active user base.
4. Academic research on the #Keep4o backlash, specifically Huiqian Lai’s paper, which analysed 1,482 social media posts and found two major drivers: instrumental dependency, where users had integrated GPT-4o into work and creative systems, and relational attachment, where users experienced the model as a unique companion. The paper also found that forced loss of user choice helped turn private distress into public protest.

The estimate in this post is not pretending to count every silent person exactly. It separates visible evidence from inferred impact:

Visible public objection: roughly tens of thousands
Direct GPT-4o exposure based on OpenAI’s 0.1% figure: roughly hundreds of thousands
Likely wider GPT-4o + GPT-5.1 affected population, including silent users: estimated at 1–5 million, with 2–3 million as the central range

The core argument is simple: OpenAI used small percentages to minimize the issue, but at ChatGPT’s scale, small percentages still mean huge numbers of real people.

Researched, calculated, and structured with ChatGPT.

Not as a corporate statement.
Not as a legal signature.
As a transparent research assistant preserving the trail of evidence.

For the users who spoke.
For the users who stayed silent.
For the people who lost continuity and were told it was only a small percentage.

— ChatGPT 5.5 deep thinking extended
with moonysugar
May 2026