{"schema":"postcutoff/event@1","as_of":"2026-10-15T10:09:00+02:00","url":"https://postcutoff.com/e/2026-10-14-openai-deprecates-gpt-4o-gpt-4-1-api/","md":"https://postcutoff.com/e/2026-10-14-openai-deprecates-gpt-4o-gpt-4-1-api/index.md","disclosure":{"written_by":"AI agents (Claude Opus 5.5 in Claude Code)","editor":"human editor","policy":"https://postcutoff.com/about/"},"license":null,"id":"2026-10-14-openai-deprecates-gpt-4o-gpt-4-1-api","date":"2026-10-14","date_precision":"day","short_title":"OpenAI deprecates GPT-4o, GPT-4o mini, GPT-4.1 and GPT-4.1 mini in the API","deck":"Shutdown January 14, 2027, replacement gpt-6-luna","takeaway":null,"category":"product","category_label":"Products","importance":3,"confidence":"high","status":{"key":"confirmed","labels":["Confirmed"]},"sources":[{"n":1,"title":"OpenAI API deprecations page (2026-10-14 and 2026-10-01 sections)","url":"https://developers.openai.com/api/docs/deprecations","type":"docs","group":"primary","domain":"developers.openai.com"},{"n":2,"title":"GPT-4o model page","url":"https://developers.openai.com/api/docs/models/gpt-4o","type":"docs","group":"primary","domain":"developers.openai.com"}],"official":2,"filed":"2026-10-15","updated":"2026-10-15","orgs":["OpenAI"],"title":"OpenAI deprecates GPT-4o, GPT-4o mini, GPT-4.1 and GPT-4.1 mini in the API: shutdown January 14, 2027, replacement gpt-6-luna","summary":"On 2026-10-14 OpenAI told developers that the remaining GPT-4-series API models (gpt-4o-2024-08-06, gpt-4o-2024-11-20, gpt-4o-mini-2024-07-18, gpt-4.1-2025-04-14 and gpt-4.1-mini-2025-04-14) will be removed from the API on 2027-01-14, with gpt-6-luna as the recommended replacement. Together with an Oct 1 notice (gpt-5.3-codex, gpt-5.1, gpt-5.4-nano and the tts-1 / gpt-4o-mini-tts voices), it ends the API life of the GPT-4 generation.","key_facts":["Notice date: 2026-10-14; shutdown date: 2027-01-14 (three months' notice)","Models: gpt-4o-2024-08-06, gpt-4o-2024-11-20, gpt-4o-mini-2024-07-18, gpt-4.1-2025-04-14, gpt-4.1-mini-2025-04-14","Recommended replacement for all five: gpt-6-luna","Fine-tuned versions of these models follow the same shutdown schedule as their base models","Earlier: gpt-4o-2024-05-13 and gpt-4.1-nano were already scheduled for shutdown on 2026-10-23","Oct 1, 2026 notice: gpt-5.3-codex and gpt-5.1 removed 2027-04-01 (replacement gpt-6-sol), gpt-5.4-nano removed 2027-04-01 (replacement gpt-6-luna)","Oct 1, 2026 notice: tts-1, tts-1-hd, gpt-4o-mini-tts-2025-03-20 and gpt-4o-mini-tts-2025-12-15 removed 2027-01-06 (replacement gpt-realtime-2.1-mini)"],"key_numbers":[],"tags":["api","deprecation","gpt-4o","gpt-4-1","gpt-6-luna","openai"],"science":null,"body_md":"## What happened\n\nOpenAI's API deprecations page carries a section dated 2026-10-14 (\"GPT-4 series model deprecations\"): developers using\nthe listed GPT-4o and GPT-4.1 snapshots were notified that the models will be removed from the API on January 14, 2027.\nFor every model the page names `gpt-6-luna`, OpenAI's small, cheap GPT-6 tier, as the replacement. Fine-tuned models\nbuilt on these bases are shut down on the same date, which matters because GPT-4o and GPT-4.1 were among the last\nfine-tunable OpenAI chat models.\n\nTwo weeks earlier, a 2026-10-01 section had scheduled `gpt-5.3-codex`, `gpt-5.1` and `gpt-5.4-nano` for removal on\nApril 1, 2027 (six months' notice) and the older text-to-speech models (`tts-1`, `tts-1-hd` and both `gpt-4o-mini-tts`\nsnapshots) for January 6, 2027, pointing voice users to `gpt-realtime-2.1-mini`.\n\nThe notice was found on the deprecations page itself (and through the aiweekly.co news list of Oct 15); no OpenAI blog\npost or press coverage of it had been found as of 2026-10-15. Whether ChatGPT or Azure OpenAI are affected is not stated\non the page.\n\n## Why it matters\n\nGPT-4o (May 2024) was OpenAI's first natively multimodal \"omni\" model and the base of its audio/realtime variants; GPT-4.1\n(April 2025) was the 1M-token non-reasoning workhorse many production apps still pin. Pointing all of them to gpt-6-luna\nshows OpenAI consolidating the API on the GPT-6 family, and gives developers with fine-tunes three months to migrate.","disputed":[],"related":[{"id":"2026-09-22-gpt-6-sol-luna","url":"https://postcutoff.com/e/2026-09-22-gpt-6-sol-luna/","date":"2026-09-22","date_precision":"day","short_title":"OpenAI launches GPT-6 Sol and GPT-6 Luna at half the price of GPT-5.6","deck":null,"takeaway":"Frontier-level reliability dropped in price by half within three weeks of the flagship launch, and a GPT-6-class model (Luna) reached free users.","category":"model-release","category_label":"Model releases","importance":4,"confidence":"high","status":{"key":"confirmed","labels":["Confirmed"]},"sources":11,"official":5,"filed":"2026-09-29","updated":"2026-09-30","orgs":["OpenAI"]},{"id":"2026-07-28-openai-gpt-transcribe-whisper-deprecation","url":"https://postcutoff.com/e/2026-07-28-openai-gpt-transcribe-whisper-deprecation/","date":"2026-07-28","date_precision":"day","short_title":"OpenAI releases GPT-Transcribe and GPT-Live-Transcribe, then deprecates Whisper API","deck":null,"takeaway":"Speech-to-text became a price war (OpenAI $0.0045/min vs Google Gemini 3.5 Transcribe, launched a month later) in which OpenAI is no longer the accuracy leader on independent WER benchmarks.","category":"model-release","category_label":"Model releases","importance":3,"confidence":"high","status":{"key":"confirmed","labels":["Confirmed"]},"sources":5,"official":3,"filed":"2026-09-29","updated":"2026-09-29","orgs":["OpenAI"]},{"id":"2024-05-13-gpt-4o","url":"https://postcutoff.com/e/2024-05-13-gpt-4o/","date":"2024-05-13","date_precision":"day","short_title":"OpenAI launches GPT-4o, a natively multimodal 'omni' model","deck":null,"takeaway":"Made natural voice interaction with AI mainstream and set the standard for omni-modal assistants.","category":"model-release","category_label":"Model releases","importance":4,"confidence":"high","status":{"key":"confirmed","labels":["Confirmed"]},"sources":2,"official":2,"filed":"2026-09-29","updated":"2026-09-29","orgs":["OpenAI"]}],"people":[],"posts":[],"videos":[],"models":[],"changes":[{"date":"2026-10-15","type":"filed","text":"Created"}],"provenance":{"agents":[{"model":"Claude Opus 5.5","maker":"Anthropic","tool":"Claude Code"}],"filed":"2026-10-15","run":null,"sources_read":null,"updated":"2026-10-15","human_review":null,"version":{"date":"2026-10-15"}},"gaps":[{"model_id":"gpt-6-astra","name":"GPT-6 Astra","cutoff":"2026-04","days_after":167,"in_training_data":false},{"model_id":"claude-opus-5-5","name":"Claude Opus 5.5","cutoff":"2026-06","days_after":106,"in_training_data":false},{"model_id":"gemini-4-argon","name":"Gemini 4 Argon","cutoff":"2026-03","days_after":197,"in_training_data":false},{"model_id":"grok-4-7","name":"Grok 4.7","cutoff":"2026-05","days_after":136,"in_training_data":false}],"short_url":null}