Evaluation & Testing

Langtest

Ensure safe and effective language models with Langtest.

Status
Generally available
Last checked
Checked · Oct 11, 2026
License
Open source
Pricing
Free tier · from $0
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What it is

Langtest is an open-source tool designed to help developers ensure that their language models are both safe and effective. It provides a framework for testing and validating the performance of AI-driven applications, ensuring they meet desired standards before deployment.

Langtest stands out by offering a comprehensive testing framework specifically tailored for language models, ensuring that developers can rigorously validate their AI applications before deployment.

When it fits — and when it doesn’t

A good fit for

  • Teams developing language models who need a robust testing framework to ensure safety and effectiveness before deployment.

  • Data science teams looking for tools to validate their AI-driven applications against ethical guidelines.

Look elsewhere if

  • Projects that require real-time performance metrics as Langtest is designed for batch processing of test cases.

  • Teams with limited technical expertise in Python, as the tool requires programming knowledge to configure and run tests.

Known weaknesses

Each one links to the public issue, changelog or docs page it came from, where we have one.

  1. 01

    Limited integrations with non-Python frameworks and tools

    Primary focus on Python ecosystem, limited support for other languages and platforms

  2. 02

    Documentation lacks depth and examples for advanced use cases

    Community feedback indicates a need for more detailed documentation and practical examples

What it does well

  • Comprehensive testing framework for language models

  • Supports a wide range of safety and effectiveness tests

  • Flexible configuration options to tailor testing scenarios

Pricing

Free tier
YesOpen source — free to use
Paid from
$0
Model
Flat rate
Enterprise plan
No

Pricing not independently confirmed — check the vendor’s page.

Performance benchmarks

How Fast Is It?

Set up Langtest

Setup steps, common gotchas and what to check after 30 days.

Open the setup guide →