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What is Antaeus?

Antaeus acts as a semantic policy engine aimed at developers focused on evaluating human-written rules concerning language, context, intent, or exceptions. The engine is built on an open-source core using Go and includes a command-line interface capable of loading policy artifacts in either YAML or JSON formats, validating them against versioned schemas while carrying out named regression tests. Through this evaluation process, it produces definitive results such as allow, review, deny, or failure, along with the identification of the policy and supporting evidence for the decisions rendered, while delegating the tasks of authentication, authorization, and subsequent actions to the application itself. Developers have the flexibility to run a deterministic, credential-free local workflow or take advantage of an experimental hosted dashboard and API for managing policies and assessing various inputs. Additionally, an experimental OpenAI evaluator is also available for testing purposes. It is essential to keep in mind that Antaeus is still in its developmental phase; therefore, the capacity of the hosted service is somewhat constrained and lacks a production-level service level agreement (SLA), which may lead to reliability issues when demand is high. As such, potential users should consider these limitations when integrating Antaeus into their workflows.

What is Agenta?

Agenta is a full-featured, open-source LLMOps platform designed to solve the core challenges AI teams face when building and maintaining large language model applications. Most teams rely on scattered prompts, ad-hoc experiments, and limited visibility into model behavior; Agenta eliminates this chaos by becoming a central hub for all prompt iterations, evaluations, traces, and collaboration. Its unified playground allows developers and product teams to compare prompts and models side-by-side, track version changes, and reuse real production failures as test cases. Through automated evaluation workflows—including LLM-as-a-judge, built-in evaluators, human feedback, and custom scoring—Agenta provides a scientific approach to validating prompts and model updates. The platform supports step-level evaluation, making it easier to diagnose where an agent’s reasoning breaks down instead of inspecting only the final output. Advanced observability tools trace every request, display error points, collect user feedback, and allow teams to annotate logs collaboratively. With one click, any trace can be turned into a long-term test, creating a continuous feedback loop that strengthens reliability over time. Agenta’s UI empowers domain experts to experiment with prompts without writing code, while APIs ensure developers can automate workflows and integrate deeply with their stack. Compatibility with LangChain, LlamaIndex, OpenAI, and any model provider ensures full flexibility without vendor lock-in. Altogether, Agenta accelerates the path from prototype to production, enabling teams to ship robust, well-tested LLM features and intelligent agents faster.

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Integrations Supported

OpenAI

Integrations Supported

OpenAI
Cohere
Falcon AI
Hugging Face
LangChain
Llama
Llama 2
Llama 3
Llama 3.1
Llama 3.2
Llama 3.3
Python

API Availability

Has API

API Availability

Has API

Pricing Information

Free
The local Go engine is available under the Apache-2.0 license at no charge. Hosted usage includes a shared free allowance of up to 100 completed decisions per day, subject to shared capacity and without a production SLA. Paid usage is available through credit purchases starting at $10; hosted evaluation charges are usage-based.
Free Version

Pricing Information

Free
Free Version

Supported Platforms

SaaS
Mac
On-Prem
Linux

Supported Platforms

SaaS

Customer Service / Support

Web-Based Support

Customer Service / Support

24 Hour Support
Web-Based Support

Training Options

Documentation Hub

Training Options

Documentation Hub
Online Training

Company Facts

Organization Name

Antaeus

Company Website

antaeus.io

Company Facts

Organization Name

Agenta

Date Founded

2023

Company Location

Germany

Company Website

agenta.ai/

Categories and Features

Categories and Features

Prompt Engineering

Not specified

Prompt Management

Not specified

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