Updated Box, Notion, Linear, and Dropbox apps
OpenAI rolled out upgraded Box, Notion, Linear, and Dropbox apps in ChatGPT with new app actions, added write capabilities where supported, and the latest in-product app experience.
OpenAI changelog: March 2026
16 releases from to
Everything OpenAI shipped in March 2026, collected from official OpenAI sources. Each entry is dated and links to the page it came from.
March 2026 at a glance
March 2026 was OpenAI's busiest month of the 12 months to then: 16 releases, about 2.8× its monthly average of 6. That was 1 release more than February 2026. Most were Model (7), followed by Product (4) and Developer Tools (3).
Releases
16
+1 vs February 2026
Rank of 12 months
1st
Average 5.7 a month
Most shipped
Model
7 releases
Notable OpenAI launches in March 2026
- Model
GPT-5.4 mini in ChatGPT
OpenAI rolled out GPT-5.4 mini as a lightweight reasoning fallback for free, Go, and paid users when higher-tier limits are reached.
Source: OpenAI Help Center Release Notes - Model
GPT-5.4 mini and nano
Released GPT-5.4 mini and GPT-5.4 nano to the Chat Completions and Responses API. GPT-5.4 mini brings GPT-5.4-class capabilities to a faster, more efficient model for high-volume workloads, while GPT-5.4 nano is optimized for simple high-volume tasks where speed and cost matter…
Source: OpenAI API Changelog - Model
GPT-5.3 Instant update
OpenAI refined GPT-5.3 Instant again, focusing on follow-up tone and reducing teaser-style phrasing.
Source: OpenAI Help Center Release Notes
All OpenAI releases in March 2026
Newest first. Each entry links to the official page it came from.
March 202616 releases
Location Sharing
ChatGPT added optional device-location sharing so it can return more relevant local recommendations, news, and weather.
Codex for Students
Verified university students in the U.S. and Canada can claim Codex credits to extend usage beyond the normal plan limits.
A simplified sidebar on mobile
ChatGPT simplified its mobile sidebar so plan-based experiences like Images, Codex, Pulse, and Apps now sit in a horizontal bar above chats and projects.
Plugins in Codex
Codex now supports plugins: installable bundles that package skills, app integrations, and MCP server configuration for reusable workflows. Plugins are available in the Codex app, CLI, and IDE extensions.
GPT-5.4 mini in ChatGPT
OpenAI rolled out GPT-5.4 mini as a lightweight reasoning fallback for free, Go, and paid users when higher-tier limits are reached.
GPT-5.4 mini and nano
Released GPT-5.4 mini and GPT-5.4 nano to the Chat Completions and Responses API. GPT-5.4 mini brings GPT-5.4-class capabilities to a faster, more efficient model for high-volume workloads, while GPT-5.4 nano is optimized for simple high-volume tasks where speed and cost matter…
GPT-5.3 Instant update
OpenAI refined GPT-5.3 Instant again, focusing on follow-up tone and reducing teaser-style phrasing.
Sora video edits endpoint
Added POST /v1/videos/edits for editing existing videos. This will replace POST /v1/videos/{video_id}/remix , which will be deprecated in 6 months.
Sora API: characters, 20-second videos, 1080p
Expanded the Sora API with reusable character references, longer generations up to 20 seconds, 1080p output for sora-2-pro , video extensions, and Batch API support for POST /v1/videos . 1080p generations on sora-2-pro are billed at $0.70 per second.
Codex app 26.312: themes and revamped automations
Introduced theme customization in Settings, revamped automations with local/remote execution options, and template-based automation creation
Codex Security preview
OpenAI folds Aardvark into Codex Security and rolls it out as a research preview for Enterprise, Business, and Edu customers via Codex web.
GPT-5.4 Thinking in ChatGPT
OpenAI brought GPT-5.4 Thinking into ChatGPT, folding its newer frontier model into the reasoning mode for harder work.
GPT-5.4 and GPT-5.4 Pro
Released GPT-5.4 , our newest frontier model for professional work, to the Chat Completions and Responses API, and released GPT-5.4 Pro to the Responses API for tougher problems that benefit from more compute. Also released: Tool search in the Responses API, which lets models de…
Codex app expands to Windows
The Codex app update makes the app available on Windows and keeps the higher rate limits across the app, CLI, IDE, and cloud surfaces.
GPT-5.3 Instant Update
OpenAI updated GPT-5.3 Instant with more accurate search-grounded answers, fewer dead ends, and smoother conversational flow.
Where March 2026 sits
OpenAI releases per month, for March 2026 and the 11 months before it. A taller bar means more releases that month; the dated entries for each month are on its own page.
Other companies in March 2026
30 of the companies we track shipped in March 2026; OpenAI ranks 2nd by number of releases.
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