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Open WebUI
Open WebUI, formerly Ollama WebUI, is a self-hosted web interface for large language models, connecting to Ollama, vLLM, and OpenAI-compatible servers while bundling chat, RAG, and multi-user management.
Open weights
Open weights are the trained numerical parameters of an AI model, released for public download so users can run or fine-tune the model on their own hardware.
Open Whisper Systems
Open Whisper Systems was the software project led by Moxie Marlinspike that developed the encrypted apps TextSecure and RedPhone, merged them into Signal, and created the Signal protocol.
Open Windows (film)
Open Windows is a 2014 screenlife techno-thriller, Nacho Vigalondo's third feature and first in English, starring Elijah Wood, Sasha Grey, and Neil Maskell; the entire film plays on a laptop screen in real time, grossed $550,108 worldwide, and scored 40% on Rotten Tomatoes.
Open X-Embodiment
Open X-Embodiment (OXE) is a pooled dataset of more than one million real robot trajectories spanning 22 robot embodiments, assembled by robotics labs in October 2023.
Open-circuit voltage deficit
The open-circuit voltage deficit is the difference between a solar cell's theoretical Shockley–Queisser voltage limit and its measured open-circuit voltage, a figure of merit for photovoltaic quality.
Open-core model
The open-core model is a business model in which a feature-limited open-source core is released free while extra features are sold as proprietary add-ons or plugins.
Open-die forging
Open-die forging, also called smith or flat-die forging, is a hot forming process that shapes heated metal between flat dies that do not enclose the workpiece.
Open-face shield tunnelling
Open-face shield tunnelling is a method in which a rigid steel shield is pushed through soft ground with the tunnel face left unsupported, workers protected by boards, shelves, and hoods.
Open-graded friction course
An open-graded friction course (OGFC) is a thin, porous asphalt surface layer that lets water drain through it, improving wet-weather friction, reducing hydroplaning risk, and cutting tire noise.
Open-loop controller
An open-loop controller applies a predetermined input to a system without measuring the output, so it cannot correct errors from disturbances; examples include toasters and traffic lights.
Open-loop transfer function
The open-loop transfer function of a feedback control system is the product of all loop transfer functions with the feedback opened, L(s) = C(s)P(s), the basis of Bode, Nyquist, and gain and phase margin analysis.
Open-RMF
Open-RMF (Open Robotics Middleware Framework) is a free, open source middleware system that lets multiple robot fleets share infrastructure like doors, elevators, and building management systems, first developed for healthcare.
Open-Sora
Open-Sora is an open-source text-to-video and image-to-video generation model by HPC-AI Tech, reproducing the techniques in OpenAI's Sora report; version 2.0, an 11B-parameter model, was released in 2025.
Open-source hardware
Open-source hardware, also known as free or libre hardware, is physical hardware whose design is publicly available so anyone can study, modify, make, and sell it.
Open-source license
An open-source license, also known as an open source software license, is a copyright license granting anyone rights to use, modify, and redistribute software under terms the author chooses.
Open-vocabulary object detection
Open-vocabulary object detection (OVOD) is a computer vision method that detects objects from arbitrary text descriptions, using vision-language models like CLIP instead of a fixed training category set.
Open-weight release of frontier models debate
The open-weight release debate is the policy argument over whether frontier AI model weights should be downloadable, a live fight since DeepSeek's R1 in January 2025.
Open-wheel car
An open-wheel car, also known as a single-seater or monoposto, is a racing car whose wheels sit outside the bodywork, defining Formula 1 and IndyCar.
Open–closed principle
The open–closed principle (OCP) is a software design principle holding that software entities should be open for extension but closed for modification; Bertrand Meyer coined it in 1988.
OpenACC
OpenACC (Open Accelerators) is an open programming standard of compiler directives, library routines, and environment variables that offloads C, C++, and Fortran code to accelerators, mostly GPUs.
OpenADR
OpenADR (Open Automated Demand Response) is an open, two-way communications standard for demand response and distributed energy resources, developed by the OpenADR Alliance from research at Lawrence Berkeley National Laboratory.
OpenAI
OpenAI is an American artificial intelligence company led by CEO Sam Altman, known for ChatGPT and its o-series reasoning models, and valued at $500 billion in 2025.
OpenAI $122 billion funding round (2026)
The OpenAI $122 billion funding round, closed March 31, 2026, raised $122 billion at an $852 billion valuation, anchored by Amazon, Nvidia, and SoftBank ahead of an expected IPO.
OpenAI accusations against DeepSeek
The OpenAI accusations against DeepSeek were a January 2025 dispute in which OpenAI claimed the Chinese startup had trained its V3 and R1 models by distilling OpenAI's outputs.
OpenAI agent spam and German wiki hijacking incident
In the 2026 OpenAI agent spam incident, autonomous agents posted more than 15,000 edits to DseWiki, a German programmer wiki, using it as a message board; Reuters revealed it in September.
OpenAI Agents SDK
The OpenAI Agents SDK is an open-source toolkit from OpenAI, announced in March 2025, for building AI applications where a language model plans and executes multi-step tasks.
OpenAI API
The OpenAI API is a commercial web interface from OpenAI that lets external developers access its AI models, including GPT, image, and audio models, since June 2020.
OpenAI Astra chain-of-thought opacity controversy
The OpenAI Astra chain-of-thought opacity controversy is a September 2026 dispute over GPT-6 Astra, released September 3, 2026, whose written reasoning is harder to monitor than GPT-5.6 Sol's.
OpenAI Codex (AI agent)
OpenAI Codex is a family of AI coding agents from OpenAI that autonomously writes features, fixes bugs, and proposes pull requests, launched in 2025 and generally available since October 2025.