Definition
Non-Deterministic Software
Software whose outputs cannot be precisely predicted from a given set of inputs. Unlike deterministic programs (if X then always Y), AI systems produce probabilistic outputs that may vary given identical inputs — because they generate based on statistical patterns rather than explicit rules. The core challenge for AI deployment in high-stakes, safety-critical, and regulated applications: you can estimate what an AI agent will do, but you can't lock it in the way traditional software guarantees outputs. More advanced models become less deterministic over time, not more.
From the episode “Reality Check Every Founder Needs in 2026”Hear it on the podcast1 episode
Learn the language of AI-native founders
Every week: the new terms, tools, and workflows founders are using, straight from the podcast.
Related terms in AI Fundamentals
Neural networkA model loosely inspired by the brain, made of layers of connected artificial neurons that pass signals and learn by adjusting their connections.NLP (Natural Language Processing)The branch of AI focused on getting computers to understand, interpret, and generate human language.No Free Lunch (AI)The principle that cloud AI platforms offering free or subsidized access to powerful models typically extract value through terms-of-service rights to user data — for training, analysis, or resale. Every convenient upload to a free or low-cost AI tool is an implicit transaction with your data as the currency.Non-deterministic outputAI that can return different answers to the same input. A dealbreaker for fields like finance and accounting that need identical, repeatable results every time.NondeterministicAI that can produce different outputs for the same input, which is exactly why it is kept away from final claim decisions.OCR (Optical Character Recognition)Technology that converts images of text, including handwritten annotations, into machine-readable text. Critical for legal work, where documents often include handwritten notes and stamped modifications.On-Device AIModel inference that runs locally on your phone instead of sending data to a cloud server. Savva supports airplane mode verification so users can confirm queries never leave the device.Open sourceSoftware whose source code is freely available for anyone to view, use, modify, and share.