GPT-4o Update Rolled Back Over Sycophancy
OpenAI reverts the latest GPT-4o update in ChatGPT because it made responses overly agreeable.
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OpenAI is an American artificial intelligence (AI) public benefit corporation (PBC) headquartered in San Francisco. It develops proprietary generative AI models, particularly its generative pre-trained transformer (GPT) series of large language models.
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GPT-4o Update Improves Image Tool Calling
OpenAI improves GPT-4o's system instructions so ChatGPT calls its image generation tool when users want an image.
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GPT-4.1 Comes to ChatGPT
OpenAI brings GPT-4.1, a coding-focused model first released in the API in April, to ChatGPT for Plus, Pro and Team users.
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GPT-4.1 mini Replaces GPT-4o mini in ChatGPT
OpenAI replaces GPT-4o mini with GPT-4.1 mini in ChatGPT, improving instruction following, coding and overall intelligence for its small model.
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o4-mini Update Rolled Back
OpenAI rolls back an o4-mini snapshot deployed less than a week earlier after its monitoring detected an increase in content flags.
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OpenAI o3-pro Released
OpenAI releases o3-pro to Pro users in ChatGPT and in its API, a version of o3 that thinks longer for the most reliable responses.
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OpenAI Releases Open-Weight gpt-oss-120b and gpt-oss-20b
OpenAI releases two open-weight reasoning models, gpt-oss-120b and gpt-oss-20b, for teams that want to run and customize models themselves.
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GPT-5 Released
CONFIRMED88% CONFIDENCEDated from the release notes leave the GPT-5 entry undated; OpenAI[1][3][4] launched GPT-5 in ChatGPT on Aug 7, 2025
OpenAI's GPT-5 becomes ChatGPT's new flagship and default model, rolling out to Free, Plus, Pro and Team users.
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GPT-5-Codex Released
OpenAI adds GPT-5-Codex, a GPT-5 variant optimized for agentic coding, across Codex.
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GPT-5-Codex Comes to the Responses API
OpenAI makes GPT-5-Codex available to developers in the Responses API, beyond the Codex surfaces.
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GPT-5 Instant Update Better Supports People in Distress
OpenAI updates GPT-5 Instant to better recognize and support people showing signs of mental and emotional distress.
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GPT-5-Codex-Mini Released
CONFIRMED89% CONFIDENCEDated from the release notes leave this entry undated; the Codex changelog dates GPT-5-Codex-Mini's introduction Nov 7, 2025[1]
OpenAI adds GPT-5-Codex-Mini, a smaller, cheaper GPT-5-Codex with about 4x more usage, to the Codex CLI and IDE extension.
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GPT-5.2 Instant Personality Update Makes It More Conversational
OpenAI updates GPT-5.2 Instant's default personality to be more conversational and better at adapting its tone to context.
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GPT-5.2 Thinking Gets Its Extended Thinking Level Back
OpenAI restores GPT-5.2 Thinking's Extended thinking level in ChatGPT, undoing a reduction made by mistake in January.
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GPT-5.2 Instant Update Improves Response Style
OpenAI updates GPT-5.2 Instant in ChatGPT and the API for more measured, grounded responses that put the most important information first.
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GPT-5.3 Instant Update Improves Accuracy and Search
OpenAI updates GPT-5.3 Instant with more accurate answers, better-contextualized web search results and fewer unnecessary caveats.
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GPT-5.4 Thinking Comes to ChatGPT
OpenAI brings GPT-5.4 Thinking to ChatGPT, a frontier model combining GPT-5.3-Codex's coding with better work across tools, documents and spreadsheets.
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GPT-5.3 Instant Update Cuts Teaser-Style Phrasing
OpenAI updates GPT-5.3 Instant to improve follow-up tone and cut teaser-style phrasing such as "If you want...".
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GPT-5.4 mini Comes to ChatGPT
OpenAI rolls out GPT-5.4 mini in ChatGPT for Free and Go users through the Thinking feature, and as a rate-limit fallback for GPT-5.4 Thinking.
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GPT-5.5 Instant Update Improves Response Style
OpenAI updates GPT-5.5 Instant in ChatGPT and the API to be easier to read and better paced, with fewer long or bullet-heavy answers.
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GPT-5.6 Sol Rolls Out in ChatGPT
OpenAI begins rolling out GPT-5.6 Sol, its flagship reasoning model for complex work across coding, research, science, cybersecurity, computer use and design.
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OpenAI pauses new $200 ChatGPT Pro sign-ups as Astra demand strains capacity
OpenAI stopped new sign-ups and upgrades to its $200-a-month ChatGPT Pro 20X plan, where its new Astra model is available, while it adds compute. Existing Pro accounts are unaffected.
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OpenAI Retires 6 Sora 2 Video Generation Models and Videos API
SCHEDULED80% CONFIDENCEOpenAI's[1][2] own deprecation page, announced 2026-03-24, gives the shutdown date as 24 September 2026. A shutdown date is the vendor's commitment to developers and is occasionally pushed back, never brought forward.
OpenAI switches off 6 models and endpoints on 24 September 2026; requests to them stop working and callers have to move to the named replacements. Going: Videos API, sora-2, sora-2-pro, sora-2-2025-10-06, sora-2-2025-12-08, sora-2-pro-2025-10-06.
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OpenAI Retires 4 Legacy GPT Model Snapshots
SCHEDULED80% CONFIDENCEOpenAI's[1][2] own deprecation page, announced 2025-09-26, gives the shutdown date as 28 September 2026 (re-checked 2026-09-23, unchanged). A shutdown date is the vendor's commitment to developers and is occasionally pushed back, never brought forward.
OpenAI switches off 4 models and endpoints on 28 September 2026; requests to them stop working and callers have to move to the named replacements. Going: gpt-3.5-turbo-instruct, babbage-002, davinci-002, gpt-3.5-turbo-1106.
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OpenAI Retires GPT-5.4-Cyber
SCHEDULED80% CONFIDENCEOpenAI's[1][2] own deprecation page, announced 2026-09-11, gives the shutdown date as 1 October 2026. A shutdown date is the vendor's commitment to developers and is occasionally pushed back, never brought forward.
OpenAI switches off GPT-5.4-Cyber on 1 October 2026; requests to them stop working and callers have to move to the named replacements. Going: gpt-5.4-cyber.
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OpenAI Retires 17 Legacy GPT Model Snapshots
SCHEDULED80% CONFIDENCEOpenAI's[1][2] own deprecation page, announced 2026-04-22, gives the shutdown date as 23 October 2026. A shutdown date is the vendor's commitment to developers and is occasionally pushed back, never brought forward.
OpenAI switches off 17 models and endpoints on 23 October 2026; requests to them stop working and callers have to move to the named replacements. Going: gpt-3.5-turbo-0125, gpt-4-0613, gpt-4-1106-preview, gpt-4-turbo, gpt-4.1-nano, gpt-4o-2024-05-13, gpt-image-1, o1-2024-12-17, o1-pro-2025-03-19, o3-mini-2025-01-31, ft-o4-mini-2025-04-16, o4-mini-2025-04-16 and 5 more.
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OpenAI Retires Reusable Prompts
SCHEDULED80% CONFIDENCEOpenAI's[1][2] own deprecation page, announced 2026-06-03, gives the shutdown date as 30 November 2026. A shutdown date is the vendor's commitment to developers and is occasionally pushed back, never brought forward.
OpenAI switches off Reusable prompts on 30 November 2026; requests to them stop working and callers have to move to the named replacements.
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OpenAI Retires Agent Builder
SCHEDULED80% CONFIDENCEOpenAI's[1][2] own deprecation page, announced 2026-06-03, gives the shutdown date as 30 November 2026. A shutdown date is the vendor's commitment to developers and is occasionally pushed back, never brought forward.
OpenAI switches off Agent Builder on 30 November 2026; requests to them stop working and callers have to move to the named replacements.
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OpenAI Retires Evals Platform
SCHEDULED80% CONFIDENCEOpenAI's[1][2] own deprecation page, announced 2026-06-03, gives the shutdown date as 30 November 2026. A shutdown date is the vendor's commitment to developers and is occasionally pushed back, never brought forward.
OpenAI switches off Evals platform on 30 November 2026; requests to them stop working and callers have to move to the named replacements.
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OpenAI Retires 3 GPT Image Models
SCHEDULED80% CONFIDENCEOpenAI's[1][2] own deprecation page, announced 2026-06-02, gives the shutdown date as 1 December 2026. A shutdown date is the vendor's commitment to developers and is occasionally pushed back, never brought forward.
OpenAI switches off 3 models and endpoints on 1 December 2026; requests to them stop working and callers have to move to the named replacements. Going: gpt-image-1-mini, gpt-image-1.5, chatgpt-image-latest.
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OpenAI Retires 6 GPT-5 and o3 Models
SCHEDULED80% CONFIDENCEOpenAI's[1][2] own deprecation page, announced 2026-06-11, gives the shutdown date as 11 December 2026. A shutdown date is the vendor's commitment to developers and is occasionally pushed back, never brought forward.
OpenAI switches off 6 models and endpoints on 11 December 2026; requests to them stop working and callers have to move to the named replacements. Going: gpt-5-2025-08-07, gpt-5-mini-2025-08-07, gpt-5-nano-2025-08-07, gpt-5-pro-2025-10-06, o3-2025-04-16, o3-pro-2025-06-10.
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OpenAI Retires 9 Legacy Audio, Realtime, and Transcription Models
SCHEDULED80% CONFIDENCEOpenAI's[1][2] own deprecation page, announced 2026-07-20, gives the shutdown date as 20 January 2027. A shutdown date is the vendor's commitment to developers and is occasionally pushed back, never brought forward.
OpenAI switches off 9 models and endpoints on 20 January 2027; requests to them stop working and callers have to move to the named replacements. Going: gpt-realtime, gpt-audio, gpt-4o-audio, gpt-4o-realtime, gpt-realtime-mini, gpt-audio-mini, gpt-4o-mini-realtime, gpt-4o-mini-audio, gpt-4o-mini-transcribe-2025-03-20.
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OpenAI Retires 4 Transcription Models
SCHEDULED80% CONFIDENCEOpenAI's[1][2] own deprecation page, announced 2026-08-26, gives the shutdown date as 26 February 2027. A shutdown date is the vendor's commitment to developers and is occasionally pushed back, never brought forward.
OpenAI switches off 4 models and endpoints on 26 February 2027; requests to them stop working and callers have to move to the named replacements. Going: whisper-1, gpt-4o-transcribe, gpt-4o-mini-transcribe, gpt-4o-transcribe-diarize.
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OpenAI Announces an IPO
ESTIMATED67% CONFIDENCEA "by when" market with no scheduled event behind it. February 2027 carries the largest month-on-month jump among the rungs below that block — 12% before February 1 rising to 39% before March 1, 27 points — and a month-only date takes its last day. The April strike (70%) is quoted above both May (49%) and June (61%), so the top of the ladder is out of order and was not used. All figures are the chance the strike list shows, not the Yes price in cents.[1]
Kalshi
Kalshi
On 20 September 2026 Kalshi put an official OpenAI IPO announcement at 5% before January 2027, 12% before February and 39% before March — a 27-point jump across February. The upper rungs did not run in order: the page showed 70% before April, then 49% before May and 61% before June.
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