In the past 48 hours, one confirmed release: Tencent's Hy4 Preview, a 770B open-weight MoE

Asked:

All AI models released in the past 48 hours

A broad live-web scan as of 2026-08-31 covering the rolling 48-hour window that opens 2026-08-29. Exactly one model release could be independently confirmed inside the window; three announcements from Aug 27–28 sit just outside it. Dates below are actual model-release dates, not publication dates of the coverage.

Blue = confirmed release inside the 48-hour window · grey = announced before the window opened, so excluded · hover any marker for detail

Parameters

770B total · 49B active

Context window

1M+ tokens

Weights on Hugging Face

~1.56 TB

Hy4 Preview is text-only and mixture-of-experts, aimed at coding, research, office productivity, and financial analysis — simonwillison.net

Only 49B of its 770B parameters are active per token, a roughly 6% activation ratio typical of large MoE designs — alextech.ai

The license is not confirmed in the reviewed sources — open weights do not by themselves establish the terms of use — deccanchronicle.com

PhoneLLM Alpha 1 (announced Aug 27) and K-Fold and Gnani Evon v3.3 (unveiled Aug 28) fall just outside a window beginning Aug 29 and are excluded — foursignals.dev

Model	Developer	Released	Type	Parameters	Context	Availability	License	Source

Live-web scan completed 2026-08-31; window = the rolling 48 hours beginning 2026-08-29. One result set, one row per confirmed model; aggregate confirmed models in window: 1. "All" cannot be guaranteed: releases may be unindexed, quietly uploaded, or announced in non-searchable channels — this is the complete set found and verified in the scan. Release date means the date the model itself shipped, not the date of any article about it. The unconfirmed license is reported as unconfirmed, not inferred.