# New in Arize: Bigger Datasets, Better Evaluations, and Expanded CV Support - **Published:** 2025-04-28 - **Updated:** 2026-07-31 - **Authors:** Sally-Ann DeLucia - **Canonical:** --- ![Text reads: Arize April Updates, side by side prompt comparison, test online eval tasks, Improved UT functions, evaluations on experiments, image segmentation support](https://arize.com/wp-content/uploads/2025/04/April-update-2.jpg) April was a big month for Arize, with updates designed to make building, evaluating, and managing your models and prompts even easier. From larger dataset runs in Prompt Playground to new evaluation features, image segmentation support, and a streamlined Python SDK, there’s a lot to explore. Here’s a look at everything we shipped. ## Larger Dataset Runs in Prompt Playground We’ve increased the row limit for datasets in the playground, so you can run prompts in parallel on up to 100 examples. ![](https://arize.com/wp-content/uploads/2025/04/promptplayground.avif) ## Evaluations on Experiments You can now create and run evals on your experiments from the UI. Compare performance across different prompt templates, models, or configurations without code. [More here](https://docs.arize.com/arize/llm-evaluation-and-annotations/catching-hallucinations/evaluations-on-experiments). ![](https://arize.com/wp-content/uploads/2025/04/Evaluations-on-Experiments.png) ## Cancel Running Background Tasks When running evaluations using background tasks, you can now cancel them mid-flight while observing task logs. [More here. ](https://docs.arize.com/arize/llm-evaluation-and-annotations/catching-hallucinations/view-task-details-and-logs#option-to-cancel-task) ![](https://arize.com/wp-content/uploads/2025/04/Running-background-1024x590.png) ## Improved UI Functions in Prompt Playground We’ve made it easier to view, test, and validate your tool calls in prompt playground. [More here.](https://docs.arize.com/arize/prompt-engineering/how-to-prompt-playground/using-tools-in-playground) ![](https://arize.com/wp-content/uploads/2025/04/Screenshot-2025-04-25-at-4.54.38%E2%80%AFPM-1024x587.png) ## Compare Prompts Side by Side Compare the outputs of a new prompt and the original prompt side-by-side. Tweak model parameters and compare results across your datasets. [More here.](https://docs.arize.com/arize/prompt-engineering/prompt-playground#compare-multiple-prompts-side-by-side) ![Compare prompts in Arize screenshot](https://arize.com/wp-content/uploads/2025/04/compare-prompts.avif) ## Image Segmentation Support for CV Models We now support logging image segmentation to Arize. Log your segmentation coordinates and compare your predictions vs. your actuals. [More here.](https://docs.arize.com/arize/machine-learning/computer-vision/use-cases-cv/image-segmentation) ![Image segmentation support for CV models in Arize](https://arize.com/wp-content/uploads/2025/04/cvsupport-1024x533.png) ## New Time Selector on Your Traces We’ve made it *way* easier to drill into specific time ranges, with quick presets like “last 15 minutes” and custom shorthand for specific dates and times, such as **10d**, **4/1 – 4/6**, **4/1 3:00am**. [More here.](https://docs.arize.com/arize/llm-tracing/how-to-query-traces/filter-traces/time-filtering) ![Time Selector gif](https://arize.com/wp-content/uploads/2025/04/timeselector.gif) ## Prompt Hub Python SDK Access and manage your prompts in code with support for OpenAI and VertexAI. [More here.](https://docs.arize.com/arize/prompt-engineering/prompt-hub-api) ```python pip install "arize[PromptHub]" ``` ## View Task Run History and Errors Get full visibility into your evaluation task runs, including when it ran, what triggered it, and if there were errors. [More here.](https://docs.arize.com/arize/llm-evaluation-and-annotations/catching-hallucinations/view-task-details-and-logs) ![view task run history in Arize](https://arize.com/wp-content/uploads/2025/04/view-task-run-history-1024x590.png) ## Run Evals and Tasks Over a Date Range Easily run your online evaluation tasks over historical data. [View video](https://arize.com/wp-content/uploads/2025/04/run-evals-over-time.mp4?_=1) https://arize.com/wp-content/uploads/2025/04/run-evals-over-time.mp4 ## More Resources - See all updates in our [Changelog ](https://docs.arize.com/arize-changelog) - Explore the [Arize documentation](https://docs.arize.com/arize) --- [More blog posts](https://arize.com/blog/sitemap.md)