OpenAI’s Astra Drives SK Hynix 8% and Samsung 4% Rally

OpenAI released its GPT-6 model, Astra, and the model’s debut renewed investor interest in AI infrastructure. SK Hynix shares rose about 8% over the week after its U.S. ADR jumped 8.1% on Friday, while Samsung Electronics shares climbed roughly 4% following strong trading in Seoul on Monday.

OpenAI describes Astra as capable of carrying out longer, multi-step tasks such as browsing, writing software, operating other programs and completing complex professional workflows. The company says these abilities can make it practical to assign more work to autonomous agents.

Analysts say assigning more tasks to agents may increase demand for datacentre components, including graphics processing units, high-bandwidth memory (HBM), server DRAM and storage. Meritz Securities analyst Hwang Soo-wook warned that ‘lower token prices should not automatically be read as weaker hardware demand’ and pointed to recovering GPU rental rates after Astra’s release as a sign of sustained compute demand.

Kiwoom Securities analyst Han Ji-young observed that Astra refocused attention on AI demand and suggested selling pressure on semiconductor stocks may be easing.

On the supply side, KB Securities reported memory inventories at Samsung and SK Hynix had fallen below 10 days of supply. Kim Dong-won, KB’s research head, said next year could bring ‘the tightest supply conditions in history.’ KB projects global hyperscaler AI infrastructure spending will reach about $1.3 trillion in 2027, up 60% from the prior year, and expects memory’s share of that investment to rise from about 14% in 2025 to roughly 57% in 2027.

Shifting production toward next-generation HBM4 memory could reduce the wafer capacity available for conventional DRAM. Industry estimates indicate HBM4 requires about three times the wafer capacity of conventional DRAM, which can tighten supplies of both premium AI memory and ordinary DRAM.

Market participants cautioned the recent stock gains are not definitive proof of a sustained supercycle. Samsung and SK Hynix have shown high volatility, and higher U.S. yields or renewed inflationary pressure could affect technology valuations. Analysts said the pace at which AI demand converts into company revenue and cash flow, together with upcoming U.S. inflation data and technology earnings reports, will be key for investors.

Astra’s release did not create the existing memory tightness, but it coincided with renewed expectations for longer-term demand for datacentre memory and related components.