OpenAI Launches GPT-5.3-Codex-Spark
OpenAI launched GPT-5.3-Codex-Spark, a new AI model designed for real-time coding. Built using Cerebras’ WSE-3 chips, the model reportedly completes tasks 15 times faster than its predecessors. The new model is currently available to ChatGPT Pro users.
- The Cerebras WSE-3 chip is one of the largest processors ever built, featuring 4 trillion transistors and 900,000 AI-optimized cores on a single dinner-plate-sized wafer of silicon. This design provides 125 petaflops of peak AI performance. - This model marks a significant hardware shift for OpenAI, representing the first major model from the company to be built on Cerebras chips rather than Nvidia GPUs. - The original OpenAI Codex, based on GPT-3, was first introduced in August 2021 and provided the underlying technology for the initial version of GitHub Copilot. - OpenAI had previously deprecated its legacy Codex models in March 2023, transitioning developers to newer GPT-3.5 and GPT-4 class models before reintroducing the "Codex" name for a more advanced coding agent in 2025. - Recent high-performing coding models from OpenAI have set a high bar, with the `o3` reasoning model solving nearly 72% of issues in a GitHub-based coding benchmark, a significant increase from the 4.4% achieved by the best models in late 2023. - The ChatGPT Pro subscription required to access the model costs $200 per month and is targeted at researchers, developers, and other power users requiring unlimited access to OpenAI's top-tier models.
