Inside Cerebras Inference: Software Optimizations Powering Performance

Everyone talks about Cerebras’ hardware — the Wafer-Scale Engine, massive memory bandwidth, and extreme parallelism. But what actually makes Cerebras inference feel fast in practice is something most people don’t see: the software. In this interview, Ryan Loney, Product Manager at Cerebras, breaks down the software optimizations powering next-gen LLM inference, and why Cerebras is still early in its performance curve — even after benchmarking 20× faster inference than NVIDIA GPUs. We cover: Why hardware alone isn’t enough for real-world inference speed How Cerebras pairs custom silicon with software to leave no performance on the table Speculative decoding explained (draft models, look-ahead tokens, and fast verification) Predicted outputs and how reusing known tokens can deliver 2× speedups Kernel, graph-level, KV cache, memory layout, and runtime scheduler optimizations Why Cerebras has more “low-hanging fruit” compared to legacy GPU stacks Unlike platforms that have spent a decade squeezing out the last drops of performance, Cerebras launched inference just a year ago — and is already compounding gains from hardware and software together. This is what next-generation inference optimization actually looks like. +++ Subscribe to our channel! https://www.youtube.com/channel/UCAAJD_MScghZj9R1cUZ3c8w Cerebras builds the world’s largest AI chip — delivering up to 20× faster inference than leading GPUs. Our mission is to engineer the future of compute and make state-of-the-art AI accessible to every team. Explore our newest open-source model and get free compute at http://cerebras.ai/. Watch our full video library: https://www.youtube.com/channel/UCAAJD_MScghZj9R1cUZ3c8w/videos/videos Read the latest engineering deep dives on our blog: https://cerebras.ai/blog Explore our systems and technology: https://cerebras.ai/publications Follow Cerebras on X: https://x.com/cerebras Connect with us on LinkedIn: https://www.linkedin.com/company/cerebras-systems/