AI model: GPT-5.4 from OpenAI

OpenAI introduced GPT-5.4 for ChatGPT, the API, and Codex, 

aimed at professional knowledge work. The model combines stronger reasoning, coding, and tool use, enabling it to operate computers and complete multi-step workflows autonomously. It supports up to a 1M-token context window and is more token-efficient than GPT-5.2. Benchmarks show gains in coding, research, and document-heavy tasks while reducing errors.

OpenAI just dropped GPT-5.4 and WOW.... - YouTube by Matthew Berman

Chess UCI tools

UCI = Universal Chess Interface - Wikipedia

The Universal Chess Interface (UCI) is an open communication protocol that enables chess engines to communicate with user interfaces.^[1][2]

cutechess/cutechess: Cute Chess is a graphical user interface, command-line interface and a library for playing chess. @GitHub

c++, gpl3

Releases · cutechess/cutechess

not "digitally signed", not "liked" by Windows; but passing AV scanner

"Microsoft Defender SmartScreen prevented an unrecognized app from starting. Running this app might put your PC at risk."

Arena Chess GUI

Arena is a free Graphical User Interface (GUI) for chess. Arena helps you in analyzing and playing games as well as in testing chess engines. It runs on Linux or Windows. Arena is compatible to UCI and Winboard protocols. Furthermore, Arena supports Chess960, DGT electronic chess boards & DGT clocks and much more.