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About

Pi is a minimal terminal coding harness built to adapt to developer workflows instead of forcing developers to adapt to it. It ships with powerful defaults, but stays intentionally small and aggressively extensible, letting users customize Pi with extensions, skills, prompt templates, themes, and shareable packages from npm or git. If a team needs a command, tool, provider, workflow, or UI tweak, they can ask Pi to build it, manipulate it in place, reload, and keep going. Pi supports interactive, print/JSON, RPC, and SDK modes, making it usable as a full terminal UI, a scriptable command, a JSON event stream, or an embeddable agent harness. It works with 15+ providers and hundreds of models, including Anthropic, OpenAI, Google, Azure, Bedrock, Mistral, Groq, Cerebras, xAI, Hugging Face, Kimi For Coding, MiniMax, OpenRouter, Ollama, and more, with mid-session model switching.

About

PromptUnit cuts your AI API bill without hurting answer quality. Inferio, the engine inside PromptUnit, checks every request your app or agent sends. When a cheaper model is just as good for that request, it uses it; otherwise the request goes to the model you asked for. If you connect keys for more than one provider, the cheaper model can be at another of them. Setup is two settings: point your AI API address at PromptUnit and add your PromptUnit key. Your own provider keys stay yours. Works with OpenAI, Anthropic, Google Gemini, Groq and DeepSeek keys, and with your own OpenRouter key, plus tools like n8n, Open WebUI, LibreChat and Dify. The dashboard shows every request: the model asked for, the model that answered, what it cost and what it saved. It also groups requests into the steps of your app and shows what each step costs. Pricing: the first $5 of savings is free, then 20% of what PromptUnit saves you, billed weekly. Nothing if it saves nothing.

Platforms Supported

Windows Supported
Mac Supported
Linux Supported
Cloud Not Supported
On-Premises Not Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Platforms Supported

Windows Not Supported
Mac Not Supported
Linux Not Supported
Cloud Supported
On-Premises Not Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Audience

Developers and AI tool builders who want a minimal, extensible terminal coding agent they can customize, script, embed, and adapt to their own workflows

Audience

Developers, startups and teams whose apps or agents pay for AI APIs (OpenAI, Anthropic, Gemini and more) and want a lower bill without worse answers.

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Supported

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Supported

API

Offers API Not Supported

API

Offers API Supported

Screenshots and Videos

Screenshots and Videos

Pricing

Free
Free Version Supported
Free Trial Not Supported

Pricing

Free
Free until PromptUnit saves you money. Then 20% of what it saves, billed weekly. The first $5 of savings is free. Nothing if it saves nothing.
Free Version Supported
Free Trial Not Supported

Reviews/Ratings

Overall 5.0 / 5
ease 5.0 / 5
features 5.0 / 5
design 5.0 / 5
support 5.0 / 5

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Pros & Cons from Real Users

Pros

  • Pi Agent looks really appealing from a developer’s point of view because it is simple, open-source, and focused on the actual mechanics of building coding agents. It is not trying to be a giant all-in-one platform. It gives you the core pieces: a unified LLM API, an agent loop, a terminal UI, and a coding-agent CLI. I especially like the context-engineering approach. Being able to control project instructions with AGENTS.md, customize the system prompt with SYSTEM.md, and manage long sessions through compaction makes Pi feel built for developers who actually understand how fragile agent context can be. The open-source MIT license is a big plus too. If I am building serious agent workflows, I want to inspect the harness, modify it, swap models, and understand what is happening under the hood instead of being locked into a black-box coding assistant.

Cons

  • Pi Agent is probably not the best fit for someone who wants a polished, fully managed AI coding product out of the box. It feels more like a toolkit for developers who are comfortable configuring their own workflows, choosing models, and tuning the agent behavior. I would also want to test reliability carefully before using it on production repos. Coding agents can make impressive changes, but they can also get stuck, over-edit files, miss project conventions, or make subtle mistakes if the context and guardrails are not set up well. The simplicity is a strength, but it also means you may need to bring more of your own infrastructure, evals, permissions, and safety controls.

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported

Training

Documentation Supported
Webinars Not Supported
Live Online Supported
In Person Not Supported

Company Information

Pi
United States
pi.dev/

Company Information

PromptUnit
Founded: 2026
Israel
www.promptunit.ai/

Alternatives

Amp

Amp

Amp Code

Alternatives

Claude Code

Claude Code

Anthropic
Claude Duet

Claude Duet

Anthropic
Cline

Cline

Cline AI Coding Agent
Experiential

Experiential

Experiential Labs
Gemini CLI

Gemini CLI

Google
Pioneer

Pioneer

Pioneer.ai

Categories

Categories

AI Inference Supported
AI Tools Supported
LLM Routers Supported

Integrations

Anthropic Supported
Claude Supported
Claude Duet Supported
Claude for Legal Supported
Groq Supported
OpenAI Supported
Amazon Bedrock Supported
Claude Fable 5 Supported
Claude Opus 5.5 Supported
GPT-5.4 Pro Supported
GPT-5.5 Pro Supported
GPT-5.6 Terra Supported
GPT-6 Astra Supported
HOL Guard Supported
Kimi K3 Supported
MiniMax M3 Supported
Mistral AI Supported
Nativ Supported
OpenAI Bel Supported
bb Supported

Integrations

Anthropic Supported
Claude Supported
Claude Duet Supported
Claude for Legal Supported
Groq Supported
OpenAI Supported
Amazon Bedrock Not Supported
Claude Fable 5 Not Supported
Claude Opus 5.5 Not Supported
GPT-5.4 Pro Not Supported
GPT-5.5 Pro Not Supported
GPT-5.6 Terra Not Supported
GPT-6 Astra Not Supported
HOL Guard Not Supported
Kimi K3 Not Supported
MiniMax M3 Not Supported
Mistral AI Not Supported
Nativ Not Supported
OpenAI Bel Not Supported
bb Not Supported
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