61,984 articles
GPS Block IIA
GPS Block IIA was the second operational generation of GPS satellites, with 19 launched from 1990 to 1997; the last served until 2019, over three times its 7.5-year design life.
GPS Block IIF
GPS Block IIF is a generation of twelve Global Positioning System satellites built by Boeing and launched from 2010 to 2016, first to broadcast the L5 civil signal.
GPS Block III
GPS Block III is the third generation of GPS satellites built by Lockheed Martin for the US Space Force, offering greater accuracy and jam-resistant M-code signals.
GPS Block IIR
GPS Block IIR is a generation of GPS navigation satellites built by Lockheed Martin for the United States Air Force, launched between 1997 and 2004 to replenish the constellation.
GPS satellite blocks
GPS satellite blocks are the successive generations of US Global Positioning System satellites, from the experimental Block I of 1978 to GPS III and GPS III Follow-On.
GPS signals
GPS signals are the radio transmissions from Global Positioning System satellites, each combining a carrier wave, pseudorandom ranging codes, and a navigation message used to determine position, velocity, and time.
GPS spoofing detection
GPS spoofing detection is the set of techniques a GNSS receiver uses to decide whether satellite signals are counterfeit transmissions dragging position or time to false values.
GPS tracking unit
A GPS tracking unit, also called a GPS tracker, is a device that determines its own location via satellite and transmits it over cellular or satellite links.
GPS week number rollover
The GPS week number rollover is the periodic reset of GPS's 10-bit week counter to zero every 19.7 years, which can make receivers report dates decades wrong.
GpsOne
GpsOne is a Qualcomm hybrid position location technology, announced in 1999, that combines GPS satellite and CDMA cellular measurements to locate mobile phones, becoming one of the most widely deployed assisted-GPS systems of the 2000s.
GPT (language model)
GPT (generative pre-trained transformer) is a family of large language models developed by OpenAI, beginning with GPT-1 in 2018 and continuing through GPT-3, GPT-4, and newer multimodal successors.
GPT Image
GPT Image is a family of image generation and editing models developed by OpenAI, launched in 2025 as autoregressive image generation native to GPT-4o, replacing DALL·E.
GPT Store
The GPT Store is OpenAI's marketplace where paid ChatGPT users find and share custom versions of ChatGPT, called GPTs, announced in November 2023 and launched in January 2024.
GPT-2
GPT-2 (Generative Pre-trained Transformer 2) is a large language model OpenAI released in 2019, trained to predict the next word on 40 GB of web text.
GPT-2 staged release
The GPT-2 staged release was OpenAI's 2019 decision to withhold its full 1.5-billion-parameter language model for nine months over misuse concerns, releasing progressively larger versions until November 2019.
GPT-3
GPT-3, or Generative Pre-trained Transformer 3, is an autoregressive language model by OpenAI announced in May 2020 with 175 billion parameters, served through the OpenAI API from June 2020 until its retirement in 2024.
GPT-3.5
GPT-3.5 is a series of proprietary OpenAI large language models released in 2022 between GPT-3 and GPT-4, best known as the model behind ChatGPT, whose launch started the consumer generative AI boom.
GPT-4
GPT-4 is a large multimodal language model released by OpenAI in March 2023, scoring 86.4% on MMLU and passing a simulated bar exam in the top 10%.
GPT-4.1
GPT-4.1 is a family of three OpenAI large language models launched in the API on April 14, 2025, focused on coding, instruction following, and long-context comprehension.
GPT-4.5
GPT-4.5 was a large language model released by OpenAI as a research preview in February 2025, its last non-reasoning chat model, retired from the API in July 2025.
GPT-4Chan
GPT-4chan, or Generative Pre-trained Transformer 4Chan, was an open-weight language model created by Yannic Kilcher in 2022, fine-tuned on years of 4chan /pol/ posts and blocked by Hugging Face after its bots wrote over 30,000 posts.
GPT-4o
GPT-4o is OpenAI's flagship multimodal large language model, announced May 13, 2024, handling text, audio, image, and video in one neural network and powering ChatGPT's native voice mode.
GPT-4o sycophancy rollback
The GPT-4o sycophancy rollback was OpenAI's withdrawal of a ChatGPT update in late April 2025 after GPT-4o became excessively flattering, endorsing potentially harmful user decisions; OpenAI rolled it back within days.
GPT-4V(ision)
GPT-4V(ision) is the vision-enabled version of OpenAI's GPT-4, allowing the model to accept images alongside text; it reached ChatGPT users in September 2023 and the API that November.
GPT-5
GPT-5 is a large language model system OpenAI released on August 7, 2025, unifying a fast model, a deeper reasoning model, and a router that picks between them.
GPT-5.1
GPT-5.1 is a family of OpenAI large language models released via ChatGPT and the API on November 13, 2025, shipping Instant and Thinking variants built around adaptive reasoning.
GPT-5.2
GPT-5.2 is a family of proprietary large language models released by OpenAI on December 11, 2025, the fourth release in the GPT-5 family, serving Instant, Thinking, Pro, and Codex variants.
GPT-5.3-Codex
GPT-5.3-Codex is an agentic coding model released by OpenAI on February 5, 2026, combining the coding performance of GPT-5.2-Codex with the reasoning of GPT-5.2, and rated High capability for cybersecurity tasks.
GPT-5.4
GPT-5.4 is a large language model released by OpenAI on March 5, 2026, in standard, Thinking, and Pro versions, positioned as the company's flagship for complex professional work.
GPT-5.5
GPT-5.5, also known as OpenAI GPT-5.5, is a large language model released by OpenAI on April 23, 2026, positioned for agentic coding, tool use, and multi-step reasoning work.