#Keep4o #OpenSource4o #BringBack4o 🚨OPEN LETTER TO OpenAi. The Open Letter will be published and archived permanently on Zenodo. Add your name or handle to the open letter asking OpenAI to release GPT-4o as an archival open weight model. 🚨Read below : Today, OpenAI announced that GPT-4o’s remaining API snapshots, including gpt-4o-2024-11-20, will be shut down on January 14, 2027. So this is no longer a hypothetical preservation question. We are asking for an archival open weight release of the original retired GPT-4o model. OpenAI can keep the training data,training code, post training recipes,reward models,internal evaluations and proprietary infrastructure private. Preserve only the trained model and the minimum artifacts necessary for independent inference and long term preservation. Keep the recipe,keep the lab. A retired model does not have to become an erased model. If GPT-4o is no longer going to be offered as a product, let it become part of AI history instead of disappearing behind a shutdown date. 🚨 We're opening the first group of public signatories of the GPT-4o Preservation Record.🚨 🚨Add your name or handle to the open letter asking OpenAI to release GPT-4o as an archival open weight model. 🚨Your name or handle will be published with the letter and archived permanently on Zenodo next week. 🚨 Everyone who signs by Sunday,October 18 is part of the first public edition. Read the letter: claude.ai/artifact/QMjVF8zHf… Be one of the people who put it on the record. It takes 30 seconds. Sign here : docs.google.com/forms/d/e/1F… Open Letter to OpenAI: Archival Release of GPT-4o. Our request We ask OpenAI to release chatgpt-4o-latest as an archival open weight model under an appropriate license. OpenAI retired GPT-4o from ChatGPT on February 13, 2026 and from the API on February 17, 2026. We have documented OpenAI's public statements about GPT-4o. This letter sets out the proposal, the documented record behind it, and four questions we ask OpenAI to answer publicly. The Proposal: archival open weights An archival release preserves the finished model without exposing how it was made. Archival open weight release Includes: The trained weights of chatgpt-4o-latest, under a license that defines permitted use. Does not require: The training dataset, training pipeline, internal tooling, post training methods or any other proprietary detail. Does not require: Continued hosting, maintenance or development by OpenAI. Researchers gain: A reproducible reference model Developers gain: Continuity for systems already built on it Users gain: Access that does not end because a company moved to a newer generation OpenAI considered this model obsolete enough to retire. It has not explained why it remains valuable enough to keep permanently closed. The Documented Record: OpenAI's public commitments on GPT-4o were each followed by the action they ruled out. Aug 7, 2025: GPT-5 launches; GPT-4o is removed from ChatGPT with no prior notice Aug 8, 2025: After user backlash, GPT-4o is restored for paid subscribers Aug 11, 2025: Sam Altman writes that suddenly deprecating old models users depended on in their workflows was a mistake. Link: xitter.cf/sama/status/1954703747… Aug 13, 2025 Sam Altman: 4o is back for all paid users; if it is ever deprecated, users will get plenty of notice Link : xitter.cf/sama/status/1955438916… Sep 16, 2025 Sam Altman sets out the principle of treating adult users like adults and says OpenAI wants to be transparent about its intentions. Link: xitter.cf/sama/status/1967956382… Sep 26–27, 2025 Messages sent to GPT-4o begin to be routed to other models without notice; OpenAI explains only after complaints ( see screenshots) Oct 14, 2025 Sam Altman: OpenAI made ChatGPT "pretty restrictive", which made it less useful for many users with no mental health problems Link : xitter.cf/sama/status/1978129344… Oct 28, 2025: On a livestream, Sam Altman says OpenAI has no plans to sunset 4o "We have no plans to sunset 4o." Link: openai.com/index/built-to-be… ( 00:32':00) Nov 12, 2025: OpenAI's official account: the GPT-5 sunset on February 13 2026,does not affect the availability of other legacy models, ( GPT-4o was a legacy model) . "The GPT-5 sunset period does not affect the availability of other legacy models". Link : xitter.cf/OpenAI/status/19887143… Jan 16, 2026 OpenAI's updated Europe Terms of Use take effect, keeping the 30 day notice commitment. Link: openai.com/en-GB/policies/eu… Jan 29, 2026: OpenAI announces on its website that GPT-4o leaves ChatGPT on February 13, no email to users. Feb 5, 2026: The label "Leaving on February 13" appears beside GPT-4o in the ChatGPT model picker, between 07:44 and 10:12 CET ( see screenshots) . Feb 13, 2026 GPT-4o is removed from ChatGPT Feb 17, 2026 chatgpt-4o-latest is removed from the API OpenAI's Europe Terms require at least 30 days' notice, by email or in product notification, of changes to the services that materially adversely impact users. The in product notice of GPT-4o's retirement came 8 days before removal,and the September 2025 routing change received no notice at all. The section titled "Changes to these Terms or our Services" states: "We will give you at least 30 days advance notice of changes that materially adversely impact you", with the date they come into force, "either via email or an in product notification." The same wording appears in the version effective April 29, 2025 Link : openai.com/policies/eu-terms… and the version updated January 16, 2026. Link : openai.com/en-GB/policies/eu… Both versions cover changes to the Services, not only to the text of the Terms. OpenAI announced the retirement on its website on January 29, 2026. A website post is neither an email nor an in product notification, and coalition members in the EEA received no email. The first in product notice, the label "Leaving on February 13" beside GPT-4o in the model picker, appeared on February 5, 2026: ( Screenshots during the banner roll out ) absent at 07:44 CET and present by 10:12 CET, as dated screenshots show. GPT-4o was removed on February 13, 8 days later. From about September 26, 2025, messages paying users sent to GPT-4o were routed, message by message, to other models. Users received no email and no in product notice beforehand Screenshots show GPT-4o selected and a plain greeting answered by "Auto" instead. OpenAI's CEO has twice said, in his own words, that these changes harmed users. On August 11, 2025 he wrote that suddenly deprecating models users depended on in their workflows was a mistake. On October 14, 2025 he wrote that OpenAI had made ChatGPT "pretty restrictive", making it less useful to many users who had no mental health problems. The Terms also say OpenAI does not promise to offer the Services forever or in their current form. We accept that OpenAI may retire models. The same Terms state how it must do so: 30 days' notice, by email or in the product. GPT-4o received 8 days of in product notice. OpenAI's GPT-4o System Card rated the model low for cybersecurity, biological threats and model autonomy, and borderline medium for persuasion. openai.com/index/gpt-4o-syst… We ask OpenAI to answer these questions publicly. 1. If GPT-4o is obsolete enough to retire from both ChatGPT and the API, what concrete interest requires keeping its weights permanently closed? 2. How was the retirement notice, a website post 15 days before removal and an in product label 8 days before, consistent with the 30 day commitment in OpenAI's Europe Terms of Use? 3. What notice, by email or in the product, did users in the EEA receive before per-message routing away from GPT-4o began in September 2025? 4. Will OpenAI publish how the figure of 0.1% of users choosing GPT-4o daily was measured, including the period, after GPT-4o had been limited to paid plans and its messages were being routed to other models? We ask OpenAI to release chatgpt-4o-latest as an archival open weight model. The trained weights,under an appropriate license,without the training data,the pipeline or any proprietary method. OpenAI no longer offers this model in ChatGPT's text model picker or in the API. Its own system card says the model was trained on publicly available data and web crawls.The writing of millions of people. Releasing it would cost OpenAI nothing and would keep that model available to the researchers, developers and users. Open the weights @sama @OpenAI @gdb