List of the Top 16 LLM Evaluation Tools for OpenAI in 2025

Langfuse is an open-source platform designed for LLM engineering that allows teams to debug, analyze, and refine their LLM applications at no cost. With its observability feature, you can seamlessly integrate Langfuse into your application to begin capturing traces effectively. The Langfuse UI provides tools to examine and troubleshoot intricate logs as well as user sessions. Additionally, Langfuse enables you to manage prompt versions and deployments with ease through its dedicated prompts feature. In terms of analytics, Langfuse facilitates the tracking of vital metrics such as cost, latency, and overall quality of LLM outputs, delivering valuable insights via dashboards and data exports. The evaluation tool allows for the calculation and collection of scores related to your LLM completions, ensuring a thorough performance assessment. You can also conduct experiments to monitor application behavior, allowing for testing prior to the deployment of any new versions. What sets Langfuse apart is its open-source nature, compatibility with various models and frameworks, robust production readiness, and the ability to incrementally adapt by starting with a single LLM integration and gradually expanding to comprehensive tracing for more complex workflows. Furthermore, you can utilize GET requests to develop downstream applications and export relevant data as needed, enhancing the versatility and functionality of your projects.

Utilizing a comprehensive set of observability tools enables you to thoroughly assess, test, and deploy LLM applications throughout both development and production phases. You can efficiently log traces and spans, while also defining and computing evaluation metrics to gauge performance. Scoring LLM outputs and comparing the efficiencies of different app versions becomes a seamless process. Furthermore, you have the capability to document, categorize, locate, and understand each action your LLM application undertakes to produce a result. For deeper analysis, you can manually annotate and juxtapose LLM results within a table. Both development and production logging are essential, and you can conduct experiments using various prompts, measuring them against a curated test collection. The flexibility to select and implement preconfigured evaluation metrics, or even develop custom ones through our SDK library, is another significant advantage. In addition, the built-in LLM judges are invaluable for addressing intricate challenges like hallucination detection, factual accuracy, and content moderation. The Opik LLM unit tests, designed with PyTest, ensure that you maintain robust performance baselines. In essence, building extensive test suites for each deployment allows for a thorough evaluation of your entire LLM pipeline, fostering continuous improvement and reliability. This level of scrutiny ultimately enhances the overall quality and trustworthiness of your LLM applications.

Introducing the first-ever platform tailored specifically for prompt engineers, where users can log their OpenAI requests, examine their usage history, track performance metrics, and efficiently manage prompt templates. This innovative tool ensures that you will never misplace that ideal prompt again, allowing GPT to function effortlessly in production environments. Over 1,000 engineers have already entrusted this platform to version their prompts and effectively manage API usage. To begin incorporating your prompts into production, simply create an account on PromptLayer by selecting “log in” to initiate the process. After logging in, you’ll need to generate an API key, making sure to keep it stored safely. Once you’ve made a few requests, they will appear conveniently on the PromptLayer dashboard! Furthermore, you can utilize PromptLayer in conjunction with LangChain, a popular Python library that supports the creation of LLM applications through a range of beneficial features, including chains, agents, and memory functions. Currently, the primary way to access PromptLayer is through our Python wrapper library, which can be easily installed via pip. This efficient method will significantly elevate your workflow, optimizing your prompt engineering tasks while enhancing productivity. Additionally, the comprehensive analytics provided by PromptLayer can help you refine your strategies and improve the overall performance of your AI models.

Klu.ai is an innovative Generative AI Platform that streamlines the creation, implementation, and enhancement of AI applications. By integrating Large Language Models and drawing upon a variety of data sources, Klu provides your applications with distinct contextual insights. This platform expedites the development of applications using language models like Anthropic Claude (Azure OpenAI), GPT-4 (Google's GPT-4), among others, allowing for swift experimentation with prompts and models, collecting data and user feedback, as well as fine-tuning models while keeping costs in check. Users can quickly implement prompt generation, chat functionalities, and workflows within a matter of minutes. Klu also offers comprehensive SDKs and adopts an API-first approach to boost productivity for developers. In addition, Klu automatically delivers abstractions for typical LLM/GenAI applications, including LLM connectors and vector storage, prompt templates, as well as tools for observability, evaluation, and testing. Ultimately, Klu.ai empowers users to harness the full potential of Generative AI with ease and efficiency.

Athina serves as a collaborative environment tailored for AI development, allowing teams to effectively design, assess, and manage their AI applications. It offers a comprehensive suite of features, including tools for prompt management, evaluation, dataset handling, and observability, all designed to support the creation of reliable AI systems. The platform facilitates the integration of various models and services, including personalized solutions, while emphasizing data privacy with robust access controls and self-hosting options. In addition, Athina complies with SOC-2 Type 2 standards, providing a secure framework for AI development endeavors. With its user-friendly interface, the platform enhances cooperation between technical and non-technical team members, thus accelerating the deployment of AI functionalities. Furthermore, Athina's adaptability positions it as an essential tool for teams aiming to fully leverage the capabilities of artificial intelligence in their projects. By streamlining workflows and ensuring security, Athina empowers organizations to innovate and excel in the rapidly evolving AI landscape.

OpenPipe presents a streamlined platform that empowers developers to refine their models efficiently. This platform consolidates your datasets, models, and evaluations into a single, organized space. Training new models is a breeze, requiring just a simple click to initiate the process. The system meticulously logs all interactions involving LLM requests and responses, facilitating easy access for future reference. You have the capability to generate datasets from the collected data and can simultaneously train multiple base models using the same dataset. Our managed endpoints are optimized to support millions of requests without a hitch. Furthermore, you can craft evaluations and juxtapose the outputs of various models side by side to gain deeper insights. Getting started is straightforward; just replace your existing Python or Javascript OpenAI SDK with an OpenPipe API key. You can enhance the discoverability of your data by implementing custom tags. Interestingly, smaller specialized models prove to be much more economical to run compared to their larger, multipurpose counterparts. Transitioning from prompts to models can now be accomplished in mere minutes rather than taking weeks. Our finely-tuned Mistral and Llama 2 models consistently outperform GPT-4-1106-Turbo while also being more budget-friendly. With a strong emphasis on open-source principles, we offer access to numerous base models that we utilize. When you fine-tune Mistral and Llama 2, you retain full ownership of your weights and have the option to download them whenever necessary. By leveraging OpenPipe's extensive tools and features, you can embrace a new era of model training and deployment, setting the stage for innovation in your projects. This comprehensive approach ensures that developers are well-equipped to tackle the challenges of modern machine learning.

Phoenix is an open-source library designed to improve observability for experimentation, evaluation, and troubleshooting. It enables AI engineers and data scientists to quickly visualize information, evaluate performance, pinpoint problems, and export data for further development. Created by Arize AI, the team behind a prominent AI observability platform, along with a committed group of core contributors, Phoenix integrates effortlessly with OpenTelemetry and OpenInference instrumentation. The main package for Phoenix is called arize-phoenix, which includes a variety of helper packages customized for different requirements. Our semantic layer is crafted to incorporate LLM telemetry within OpenTelemetry, enabling the automatic instrumentation of commonly used packages. This versatile library facilitates tracing for AI applications, providing options for both manual instrumentation and seamless integration with platforms like LlamaIndex, Langchain, and OpenAI. LLM tracing offers a detailed overview of the pathways traversed by requests as they move through the various stages or components of an LLM application, ensuring thorough observability. This functionality is vital for refining AI workflows, boosting efficiency, and ultimately elevating overall system performance while empowering teams to make data-driven decisions.

Ragas serves as a comprehensive framework that is open-source and focuses on testing and evaluating applications leveraging Large Language Models (LLMs). This framework features automated metrics that assess performance and resilience, in addition to the ability to create synthetic test data tailored to specific requirements, thereby ensuring quality throughout both the development and production stages. Moreover, Ragas is crafted for seamless integration with existing technology ecosystems, providing crucial insights that amplify the effectiveness of LLM applications. The initiative is propelled by a committed team that merges cutting-edge research with hands-on engineering techniques, empowering innovators to reshape the LLM application landscape. Users benefit from the ability to generate high-quality, diverse evaluation datasets customized to their unique needs, which facilitates a thorough assessment of their LLM applications in real-world situations. This methodology not only promotes quality assurance but also encourages the ongoing enhancement of applications through valuable feedback and automated performance metrics, highlighting the models' robustness and efficiency. Additionally, Ragas serves as an essential tool for developers who aspire to take their LLM projects to the next level of sophistication and success. By providing a structured approach to testing and evaluation, Ragas ultimately fosters a thriving environment for innovation in the realm of language models.

DeepEval presents an accessible open-source framework specifically engineered for evaluating and testing large language models, akin to Pytest, but focused on the unique requirements of assessing LLM outputs. It employs state-of-the-art research methodologies to quantify a variety of performance indicators, such as G-Eval, hallucination rates, answer relevance, and RAGAS, all while utilizing LLMs along with other NLP models that can run locally on your machine. This tool's adaptability makes it suitable for projects created through approaches like RAG, fine-tuning, LangChain, or LlamaIndex. By adopting DeepEval, users can effectively investigate optimal hyperparameters to refine their RAG workflows, reduce prompt drift, or seamlessly transition from OpenAI services to managing their own Llama2 model on-premises. Moreover, the framework boasts features for generating synthetic datasets through innovative evolutionary techniques and integrates effortlessly with popular frameworks, establishing itself as a vital resource for the effective benchmarking and optimization of LLM systems. Its all-encompassing approach guarantees that developers can fully harness the capabilities of their LLM applications across a diverse array of scenarios, ultimately paving the way for more robust and reliable language model performance.

Promptfoo takes a proactive approach to identify and alleviate significant risks linked to large language models prior to their production deployment. The founders bring extensive expertise in scaling AI solutions for over 100 million users, employing automated red-teaming alongside rigorous testing to effectively tackle security, legal, and compliance challenges. With an open-source and developer-focused strategy, Promptfoo has emerged as a leading tool in its domain, drawing in a thriving community of over 20,000 users. It provides customized probes that focus on pinpointing critical failures rather than just addressing generic vulnerabilities such as jailbreaks and prompt injections. Boasting a user-friendly command-line interface, live reloading, and efficient caching, users can operate quickly without relying on SDKs, cloud services, or login processes. This versatile tool is utilized by teams serving millions of users and is supported by a dynamic open-source community. Users are empowered to develop reliable prompts, models, and retrieval-augmented generation (RAG) systems that meet their specific requirements. Moreover, it improves application security through automated red teaming and pentesting, while its caching, concurrency, and live reloading features streamline evaluations. As a result, Promptfoo not only stands out as a comprehensive solution for developers targeting both efficiency and security in their AI applications but also fosters a collaborative environment for continuous improvement and innovation.

LMOps is a comprehensive stack designed for launching production-ready applications that facilitate monitoring, model management, and additional features. Portkey serves as an alternative to OpenAI and similar API providers. With Portkey, you can efficiently oversee engines, parameters, and versions, enabling you to switch, upgrade, and test models with ease and assurance. You can also access aggregated metrics for your application and user activity, allowing for optimization of usage and control over API expenses. To safeguard your user data against malicious threats and accidental leaks, proactive alerts will notify you if any issues arise. You have the opportunity to evaluate your models under real-world scenarios and deploy those that exhibit the best performance. After spending more than two and a half years developing applications that utilize LLM APIs, we found that while creating a proof of concept was manageable in a weekend, the transition to production and ongoing management proved to be cumbersome. To address these challenges, we created Portkey to facilitate the effective deployment of large language model APIs in your applications. Whether or not you decide to give Portkey a try, we are committed to assisting you in your journey! Additionally, our team is here to provide support and share insights that can enhance your experience with LLM technologies.

AI engineering has the potential to be clear and accessible instead of shrouded in complexity. HoneyHive stands out as a versatile platform for AI observability and evaluation, providing an array of tools for tracing, assessment, prompt management, and more, specifically designed to assist teams in developing reliable generative AI applications. Users benefit from its resources for model evaluation, testing, and monitoring, which foster effective cooperation among engineers, product managers, and subject matter experts. By assessing quality through comprehensive test suites, teams can detect both enhancements and regressions during the development lifecycle. Additionally, the platform facilitates the tracking of usage, feedback, and quality metrics at scale, enabling rapid identification of issues and supporting continuous improvement efforts. HoneyHive is crafted to integrate effortlessly with various model providers and frameworks, ensuring the necessary adaptability and scalability for diverse organizational needs. This positions it as an ideal choice for teams dedicated to sustaining the quality and performance of their AI agents, delivering a unified platform for evaluation, monitoring, and prompt management, which ultimately boosts the overall success of AI projects. As the reliance on artificial intelligence continues to grow, platforms like HoneyHive will be crucial in guaranteeing strong performance and dependability. Moreover, its user-friendly interface and extensive support resources further empower teams to maximize their AI capabilities.

Recognizing the limitations of machine learning models can often be a daunting task, especially when trying to trace the data responsible for subpar results and understand the underlying causes. Galileo provides an extensive array of tools designed to help machine learning teams identify and correct data inaccuracies up to ten times faster than traditional methods. By examining your unlabeled data, Galileo can automatically detect error patterns and identify deficiencies within the dataset employed by your model. We understand that the journey of machine learning experimentation can be quite disordered, necessitating vast amounts of data and countless model revisions across various iterations. With Galileo, you can efficiently oversee and contrast your experimental runs from a single hub and quickly disseminate reports to your colleagues. Built to integrate smoothly with your current ML setup, Galileo allows you to send a refined dataset to your data repository for retraining, direct misclassifications to your labeling team, and share collaborative insights, among other capabilities. This powerful tool not only streamlines the process but also enhances collaboration within teams, making it easier to tackle challenges together. Ultimately, Galileo is tailored for machine learning teams that are focused on improving their models' quality with greater efficiency and effectiveness, and its emphasis on teamwork and rapidity positions it as an essential resource for teams looking to push the boundaries of innovation in the machine learning field.

Symflower transforms the realm of software development by integrating static, dynamic, and symbolic analyses with Large Language Models (LLMs). This groundbreaking combination leverages the precision of deterministic analyses alongside the creative potential of LLMs, resulting in improved quality and faster software development. The platform is pivotal in selecting the most fitting LLM for specific projects by meticulously evaluating various models against real-world applications, ensuring they are suitable for distinct environments, workflows, and requirements. To address common issues linked to LLMs, Symflower utilizes automated pre-and post-processing strategies that improve code quality and functionality. By providing pertinent context through Retrieval-Augmented Generation (RAG), it reduces the likelihood of hallucinations and enhances the overall performance of LLMs. Continuous benchmarking ensures that diverse use cases remain effective and in sync with the latest models. In addition, Symflower simplifies the processes of fine-tuning and training data curation, delivering detailed reports that outline these methodologies. This comprehensive strategy not only equips developers with the knowledge needed to make well-informed choices but also significantly boosts productivity in software projects, creating a more efficient development environment.

Literal AI serves as a collaborative platform tailored to assist engineering and product teams in the development of production-ready applications utilizing Large Language Models (LLMs). It boasts a comprehensive suite of tools aimed at observability, evaluation, and analytics, enabling effective monitoring, optimization, and integration of various prompt iterations. Among its standout features is multimodal logging, which seamlessly incorporates visual, auditory, and video elements, alongside robust prompt management capabilities that cover versioning and A/B testing. Users can also take advantage of a prompt playground designed for experimentation with a multitude of LLM providers and configurations. Literal AI is built to integrate smoothly with an array of LLM providers and AI frameworks, such as OpenAI, LangChain, and LlamaIndex, and includes SDKs in both Python and TypeScript for easy code instrumentation. Moreover, it supports the execution of experiments on diverse datasets, encouraging continuous improvements while reducing the likelihood of regressions in LLM applications. This platform not only enhances workflow efficiency but also stimulates innovation, ultimately leading to superior quality outcomes in projects undertaken by teams. As a result, teams can focus more on creative problem-solving rather than getting bogged down by technical challenges.

ChainForge is a versatile open-source visual programming platform designed to improve prompt engineering and the evaluation of large language models. It empowers users to thoroughly test the effectiveness of their prompts and text-generation models, surpassing simple anecdotal evaluations. By allowing simultaneous experimentation with various prompt concepts and their iterations across multiple LLMs, users can identify the most effective combinations. Moreover, it evaluates the quality of responses generated by different prompts, models, and configurations to pinpoint the optimal setup for specific applications. Users can establish evaluation metrics and visualize results across prompts, parameters, models, and configurations, thus fostering a data-driven methodology for informed decision-making. The platform also supports the management of multiple conversations concurrently, offers templating for follow-up messages, and permits the review of outputs at each interaction to refine communication strategies. Additionally, ChainForge is compatible with a wide range of model providers, including OpenAI, HuggingFace, Anthropic, Google PaLM2, Azure OpenAI endpoints, and even locally hosted models like Alpaca and Llama. Users can easily adjust model settings and utilize visualization nodes to gain deeper insights and improve outcomes. Overall, ChainForge stands out as a robust tool specifically designed for prompt engineering and LLM assessment, fostering a culture of innovation and efficiency while also being user-friendly for individuals at various expertise levels.