Testing

Selene 1

Atla is the only eval tool that helps you automatically discover the underlying issues in your AI agents. Understand step-level errors, prioritize recurring failure patterns, and fix issues fast–before your users ever notice.

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atla-ai.com

Verified API available Free tier

Quick facts
What is it	Atla is the only eval tool that helps you automatically discover the underlying issues in your AI agents. Understand step-level errors, prioritize recurring failure patterns, and fix issues fast–before your users ever notice.
Pricing	Freemium — from $199/mo
Free tier	Yes
Platform	API
API	Yes
Best for	testing AI response quality, evaluating AI agent performance
Domain registered	2023

Data updated Aug. 1, 2026

What does Selene 1 do?

Selene 1 is a specialized AI model designed specifically for evaluating other AI systems. It acts as an automated judge, providing precise scores and detailed critiques on the performance of your AI applications, particularly large language models and AI agents. The tool analyzes responses based on criteria like accuracy, relevance, and safety, giving developers concrete feedback on where their AI might be failing or excelling.

The system comes in two versions: Selene 1 for comprehensive pre-production evaluations with industry-leading accuracy, and Selene 1 Mini optimized for speed and real-time inference evaluations. Both models are available through Hugging Face Transformers, Ollama, and GitHub, making them accessible to developers familiar with these platforms. What sets Selene apart is its focus specifically on evaluation tasks rather than general conversation, trained to provide consistent, reliable judgments that beat many frontier models from leading AI labs.

This tool is particularly valuable for AI developers, research teams, and companies building AI products who need to validate their system's reliability before deployment. Real-world use cases include testing chatbot responses for accuracy, evaluating AI agent performance in complex workflows, and building trust with customers by demonstrating rigorously tested AI capabilities. It's essentially a quality assurance specialist for your AI systems.

Developer Tools LLM Testing

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Key features

What makes it stand out

AI response evaluation with precise scoring and critiques

Industry-leading accuracy for reliable performance assessment

Dual model options for comprehensive testing or real-time evaluation

Hugging Face integration for easy implementation

Specialized training for consistent judgment across various AI tasks

Who is Selene 1 for?

Who benefits most from this tool

testing AI response quality

evaluating AI agent performance

validating model reliability before deployment

Pricing

Free tier available — start without a credit card

Developer Tier

Free

2,000 traces
Agent LLM-as-a-Judge inference
Error patterns and improvement suggestions automatically generated
Up to 3 custom LLM judge metrics

Startup Tier

$199.0/month

Everything in Developer Tier, plus:

10,000 traces
60 data retention days
10 custom llm judge metrics
Custom onboarding + dedicated Slack support
Unlimited users
Up to 10 custom LLM judge metrics
60-day data retention
SOC2 report, BAA available (HIPAA)

Custom Tier

Custom

Everything in Startup Tier, plus:

Everything included
Self-hosted deployment
Unlimited project workspaces
Custom rate limits + SLA
Custom data retention period
Custom SSO and RBAC
Access to deployed engineering team
Team trainings & architectural guidance

Trust & presence

Domain Domain registered 2023

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