Opik vs. pytest Comparison


Opik Comet	pytest	+	+
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About Confidently evaluate, test, and ship LLM applications with a suite of observability tools to calibrate language model outputs across your dev and production lifecycle. Log traces and spans, define and compute evaluation metrics, score LLM outputs, compare performance across app versions, and more. Record, sort, search, and understand each step your LLM app takes to generate a response. Manually annotate, view, and compare LLM responses in a user-friendly table. Log traces during development and in production. Run experiments with different prompts and evaluate against a test set. Choose and run pre-configured evaluation metrics or define your own with our convenient SDK library. Consult built-in LLM judges for complex issues like hallucination detection, factuality, and moderation. Establish reliable performance baselines with Opik's LLM unit tests, built on PyTest. Build comprehensive test suites to evaluate your entire LLM pipeline on every deployment.	About pytest helps you write better programs. The pytest framework makes it easy to write small tests, yet scales to support complex functional testing for applications and libraries. Due to pytest’s detailed assertion introspection, only plain assert statements are used. Detailed info on failing assert statements. Auto-discovery of test modules and functions. Modular fixtures for managing small or parametrized long-lived test resources. Can run unittest (including trial) and nose test suites out of the box. Supports Python 3.6+ and PyPy 3. Rich plugin architecture, with over 315+ external plugins and thriving community. The maintainers of pytest and thousands of other packages are working with Tidelift to deliver commercial support and maintenance for the open source dependencies you use to build your applications. Save time, reduce risk, and improve code health, while paying the maintainers of the exact dependencies you use.
Platforms Supported Windows Supported Mac Supported Linux Supported Cloud Supported On-Premises 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 looking for a solution to evaluate, test, and monitor their LLM applications	Audience Developers that require a solution to run complex functional tests for applications and libraries
Support Phone Support Supported 24/7 Live Support Supported Online Supported	Support Phone Support Not Supported 24/7 Live Support Not Supported Online Supported
API Offers API Supported	API Offers API Supported
Screenshots and Videos View more images or videos	Screenshots and Videos View more images or videos
Pricing $39 per month Free Version Supported Free Trial Supported	Pricing No information available. Free Version Not Supported Free Trial Supported
Reviews/Ratings Overall 5.0 / 5 ease 5.0 / 5 features 5.0 / 5 design 4.0 / 5 support 5.0 / 5 Read all reviews	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 My team has switched to Opik from Arize about 4 months ago. We have evaluated Arize, Langfuse, Opik and Langsmith. Overall Opik was the best platform. Phoenix OSS doesn't have half the features, Langsmith is nice but super expensive and not OSS and Langfuse is brittle and has tons of performance issues. We found one bug on Opik, opened a PR on the GH repo and it was fixed and merged in less than 5 hours. Cons Personally I think they can make the UI a bit prettier.
Training Documentation Supported Webinars Supported Live Online Supported In Person Supported	Training Documentation Supported Webinars Not Supported Live Online Not Supported In Person Not Supported
Company Information Comet Founded: 2017 United States www.comet.com/site/products/opik/	Company Information pytest Founded: 2004 docs.pytest.org/en/6.2.x/
Alternatives Maxim	Alternatives behave
DeepEval Confident AI	Robot Framework
Respan	TestNG
Selene 1 atla	pytest-cov Python
Scorable View All	Playwright View All
Categories LLM Evaluation Supported	Categories Functional Testing Supported Software Testing Supported Test Automation Frameworks Supported Unit Testing Supported

Integrations Captain Not Supported Claude Supported Coverage.py Not Supported Hugging Face Supported Katalon Recorder Not Supported Katalon True Platform Not Supported LangChain Supported Launchable Not Supported LiteLLM Supported OpenAI Supported Opik Not Supported Predibase Supported Qualflare Not Supported Ragas Supported Roost.ai Not Supported Testmo Not Supported VIKTOR Not Supported Zebrunner Not Supported pytest Supported pytest-cov Not Supported Show More Integrations View All 15 Integrations	Integrations Captain Supported Claude Not Supported Coverage.py Supported Hugging Face Not Supported Katalon Recorder Supported Katalon True Platform Supported LangChain Not Supported Launchable Supported LiteLLM Not Supported OpenAI Not Supported Opik Supported Predibase Not Supported Qualflare Supported Ragas Not Supported Roost.ai Supported Testmo Supported VIKTOR Supported Zebrunner Supported pytest Not Supported pytest-cov Supported Show More Integrations View All 17 Integrations
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