Probably

All projects

Apps & Tools

A probabilistic programming language for LLM workflows powered by Jev.

bySteve

Playable

Probably media is blocked

Allow external media to connect to the provider and play this content.

Description

Probably is a small programming language designed for non-deterministic LLM workflows where a TypeScript interpreter executes logic and Jev provides judgments and probabilities. It introduces AI-centric keywords like 'feels', 'match', and 'llm' to allow developers to build structured applications around uncertain AI outputs.

Descriptions, tags, and model credits may be AI-generated or inferred from public sources and can be incomplete or wrong. Learn more.

Details

Why this is interesting: A novel and ambitious attempt to formalize LLM logic into a dedicated programming language syntax.
Attributed to: @southpolesteve
Built with: Jev Scribe v2 Redwood AI
Links: probably-lang.southpolesteve.workers.dev
View tweet
Tags: #programming-language #llm-workflow #probabilistic #typescript

Discovered: X
First posted: X · Sep 18, 2026
Listed: Added 1h ago
Build: Strong
Models: Strong

Prompt

let email = input()

if email feels "urgent" {
  print(llm "Draft a reply" using email)
}

Source

Probably

Description

Timeline

Probably

Description

Timeline