Programming Free

OpenProse

Open-source declarative language and runtime for long-running AI work

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PricingFree
Starting price$0
Free planYes
Free trialYes
APIYes
Open sourceYes
DeploymentSelf Hosted
Last verifiedJuly 30, 2026
Overview

Tool overview

OpenProse is listed under Programming AI tools.

Summary

What is OpenProse?

OpenProse is an open-source language for declaring AI outcomes in structured Markdown. Reactor compiles contracts into a dependency graph and reruns only responsibilities whose material inputs changed, leaving durable receipts for each decision.

Best fit

Best for

Developers building inspectable, long-running AI responsibilities

Audience

Who is it for?

AI application developersAgent infrastructure teamsDeveloper-tool buildersAutomation engineersAI researchers
Recommendation

Decision note

Suitable for evaluation only after reviewing final commercial terms, permissions, lifecycle status, data handling, and edit-screen aliases. Keep Needs Review enabled until a human verifies the published profile.

Capabilities

Key features

Declarative Markdown contracts for standing AI outcomes

Five contract kinds with typed maintained truth

Forme compilation into a dependency topology

Reactor runtime with fingerprint-based reconciliation

Content-addressed receipts and durable run traces

Harness-agnostic execution across supported agent hosts

Workflows

Use cases

Maintaining recurring AI responsibilities

Coordinating dependent agent workflows

Versioning agent behavior in Git

Re-running work only when inputs change

Auditing model decisions through receipts

Strengths

Pros

  • MIT-licensed open-source foundation
  • Markdown programs remain reviewable and portable
  • Supports several agent hosts
  • Keyless examples demonstrate runtime traces
Considerations

Limitations

OpenProse is frontier infrastructure and does not make model behavior deterministic. Teams must test contracts, permissions, host capabilities, cost controls, invariants, failure handling, and every consequential output before using it for unattended production work.

Cost

Pricing details

Pricing modelFree
Starting price$0
Free planYes
Free trialYes
Pricing context

Billing options

Open source

Pricing context

Pricing note

OpenProse is published under the MIT License and can be installed from its public source repository. The public language, docs, CLI path, and sample replay are free; no separate paid plan is required for the open-source core.

View official pricing
Compatibility

Supported programming languages

  • English
Connectivity

Integrations

Claude Code

Codex

OpenCode

Amp

Specs

Technical details

PlatformsWeb
Multilingual supportUnknown
Login requiredNo
Open sourceYes
LicenseMIT
DeploymentSelf Hosted
CompanyOpenProse, Inc.
Launch year2026
Current versionOpenProse 0.15.0
Models / versionsOpenProse 0.15.0 Reactor 0.3.0
Editions / plansOpenProse Reactor Reactor CLI Reactor DevTools
Data confidenceHigh
Last verifiedJuly 30, 2026
Documentation → Source code → Release notes → Data source →
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Answers

Frequently asked questions

OpenProse is an open-source language for declaring AI outcomes in structured Markdown. Reactor compiles contracts into a dependency graph and reruns only responsibilities whose material inputs changed, leaving durable receipts for each decision.
Developers building inspectable, long-running AI responsibilities
The listed pricing model for OpenProse is free. Pricing can change, so users should verify the latest plan details on the official website.
Yes. The current profile indicates that a free trial is available.
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