Z3

Input—per 1M tokens

Output—per 1M tokens

Context—tokens

WeightsClosed

About

Z3 is ranked #1 of 33 in formal verification tools on Inferse. It runs on Android, API, Linux, macOS, Self-hosted, Web, Windows. There is a free plan.

Compared on formal verification tools

Free plan: Yesgithub.com
Supported formalisms: theorem-provinggithub.com
Counterexamples: Yesgithub.com
Proof artifacts: Yesgithub.com
Input languages: SMT-LIB2, C, C++, .NET, Java, Python, Rust, OCaml, Julia, JavaScript, TypeScript, Smalltalk, Gogithub.com
Deployment: self-hostedgithub.com

Facts

Purpose: Z3 is a theorem prover and satisfiability modulo theories (SMT) solver.github.com · 2 Oct 2026
SMT-LIB: Z3 supports the SMTLIB format.github.com · 2 Oct 2026
Applications: Z3 is used in software verification and analysis applications.microsoft.com · 2 Oct 2026
Input: SMTLIB2 is Z3’s default input format.github.com · 2 Oct 2026
Build systems: Z3 can be built using CMake, vcpkg, or Bazel.github.com · 2 Oct 2026
Language interfaces: The repository documents bindings or APIs for C, C++, .NET, Java, Go, OCaml, Python, Julia, and JavaScript/TypeScript.github.com · 2 Oct 2026
Browser use: The project wiki links to a page for trying Z3 in a browser.github.com · 2 Oct 2026
Platforms: The project wiki lists Windows, OSX, Linux (Ubuntu and Debian), and FreeBSD as supported platforms.github.com · 2 Oct 2026
Downloads: The repository links to pre-built binaries for stable and nightly releases.github.com · 2 Oct 2026
License: The repository states that Z3 is licensed under the MIT license.github.com · 2 Oct 2026
Security: The README says MSVC builds enable Control Flow Guard and Address Space Layout Randomization by default.github.com · 2 Oct 2026
Dependencies: Python is required to build Z3, and additional toolchains are needed to build Java, .NET, OCaml, and Julia APIs.github.com · 2 Oct 2026
Support: The project wiki says to contact the creator of an external binding package for support issues.github.com · 2 Oct 2026