On Thursday, OpenAI introduced the discharge of a lightweight model of its agentic coding instrument Codex, the newest mannequin of which OpenAI launched earlier this month. GPT-5.3-Codex-Spark is described by the corporate as a “smaller model” of that mannequin, one that’s designed for quicker inference. To energy that inference, OpenAI has introduced in a devoted chip from its {hardware} accomplice Cerebras, marking a brand new degree of integration within the firm’s bodily infrastructure.
The partnership between Cerebras and OpenAI was introduced final month, when OpenAI mentioned that it had reached a multi-year settlement with the agency price over $10 billion. “Integrating Cerebras into our mixture of compute options is all about making our AI reply a lot quicker,” the corporate mentioned on the time. Now, OpenAI calls Spark the “first milestone” in that relationship.
Spark, which OpenAI says is designed for swift, real-time collaboration and “fast iteration,” shall be powered by Cerebras’ Wafer Scale Engine 3. The WSE-3 is Cerebras’ third-generation waferscale megachip, decked out with 4 trillion transistors. OpenAI describes the brand new light-weight instrument as a “day by day productiveness driver, serving to customers with fast prototyping” fairly than the longer, heavier duties that the unique 5.3 is designed for. Spark is at the moment having fun with a analysis preview for ChatGPT Professional customers within the Codex app.
In a tweet prematurely of the announcement, CEO Sam Altman appeared to trace on the new mannequin. “We’ve a particular factor launching to Codex customers on the Professional plan later immediately,” Altman tweeted. “It sparks pleasure for me.”
In its official assertion, OpenAI emphasised Spark as designed for the bottom potential latency on Codex. “Codex-Spark is step one towards a Codex that works in two complementary modes: real-time collaboration whenever you need fast iteration, and long-running duties whenever you want deeper reasoning and execution,” OpenAI shared. The corporate added that Cerebras’ chips excel at helping “workflows that demand extraordinarily low latency.”
Cerebras has been round for over a decade however, within the AI period, it has loved an more and more distinguished position within the tech trade. Simply final week, the corporate introduced that it had raised $1 billion in recent capital at a valuation of $23 billion. The corporate has previously announced its intentions to pursue an IPO.
“What excites us most about GPT-5.3-Codex-Spark is partnering with OpenAI and the developer group to find what quick inference makes potential — new interplay patterns, new use circumstances, and a essentially totally different mannequin expertise,” Sean Lie, CTO and Co-Founding father of Cerebras, mentioned in an announcement. “This preview is only the start.”
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June 23, 2026
