Valve Developer Lets Slip 'HLX' Codename at GameSoundCon 2026
A codename spoken by a Valve employee on a sound-design panel is the closest the public has come to confirmation, and it still is not an announcement.
Reporting from 1 source: Game Spark.
At a GameSoundCon 2026 panel on Valve's Source2 audio engine, composer Mike Morasky mentioned that 'HLX' has its own version of an HDR feature, alongside Deadlock. HLX is the long-rumored codename for the Half-Life sequel Valve has never announced. Sound designers David Feise and Carlye Nyte shared the panel. The remark drew attention partly because Feise turned to look at Morasky right after it.
The panel was about audio engineering, not product news. Morasky was describing how Valve's Source2 audio engine handles sound management across its games when he said Deadlock uses its own version of the HDR feature and that HLX has one too. The context matters: he was listing engine variants, and HLX came out as one more item in that list.
Feise turning to look at him is the detail that turned a technical aside into a story. Someone on the panel told Morasky he had only said HLX once. Valve has not announced a new Half-Life game, and the codename has surfaced in source code before without a release following.
Synthesized by Yomimono from the 1 cited source below, including Japanese-language reporting where cited, then editorially reviewed before publishing.