# Changelog 2025 12 09 Here are the most relevant improvements we've made since the last release: ## 📊 Dataset Improvements We've enhanced dataset functionality with several key improvements: - **Edit Dataset Items** - You can now edit dataset items directly from the UI, making it easier to update and refine your evaluation data. - **Remove Dataset Upload Limit for Self-Hosted** - Self-hosted deployments no longer have dataset upload limits, giving you more flexibility for large-scale evaluations. - **Dataset Item Tagging Support** - Added comprehensive tagging support for dataset items, enabling better organization and filtering of your evaluation data. - **Dataset Filtering Capabilities by Any Column** - Filter datasets by any column in both the playground and dataset view, giving you flexible ways to find and work with specific data subsets. - **Ability to Rename Datasets** - Rename datasets directly from the UI, making it easier to organize and manage your evaluation datasets. ## 📈 Experiment Updates We've made significant improvements to experiment management and analysis: - **Experiment-Level Metrics** - Compute experiment-level metrics (as opposed to experiment-item-level metrics) for better insights into your evaluation results. Read more in the [experiment-level metrics documentation](https://www.comet.com/evaluation/advanced/evaluate_your_llm#computing-experiment-level-metrics). - **Rename Experiments & Metadata** - Update experiment names and metadata config directly from the dashboard, giving you more control over experiment organization. - **Token & Cost Columns** - Token usage and cost are now surfaced in the experiment items table for easy scanning and cost visibility. :::frame Experiments page showing experiment-level metrics, graphs, and experiment items table with token and cost columns ::: ## 🎮 Playground Improvements We've made the Playground more powerful and easier to use for non-technical users: - **Easy Navigation from Playground to Dataset and Metrics** - Quick navigation links from the playground to related datasets and metrics, streamlining your workflow. - **Advanced filtering for Playground Datasets** - Filter playground datasets by tags and any other columns, making it easier to find and work with specific dataset items. - **Pagination for the Playground** - Added pagination support to handle large datasets more efficiently in the playground. - **Added Experiment Progress Bar in the Playground** - Visual progress indicators for running experiments, giving you real-time feedback on experiment status. - **Added Model-Specific Throttling and Concurrency Configs in the Playground** - Configure throttling and concurrency settings per model in the playground, giving you fine-grained control over resource usage. ## 🚨 Enhanced Alerts We've expanded alert capabilities with threshold support: - **Added Threshold Support for Trace and Thread Feedback Scores** - Configure thresholds for feedback scores on traces and threads, enabling more precise alerting based on quality metrics. - **Added Threshold to Trace Error Alerts** - Set thresholds for trace error alerts to get notified only when error rates exceed your configured limits. - **Trigger Experiment Created Alert from the Playground** - Receive alerts when experiments are created directly from the playground. ## 🤖 Opik Optimizer Updates Significant enhancements to the Opik Optimizer: - **Cost and Latency Optimization Support** - Added support for optimizing both cost and latency metrics simultaneously. Read more in the [optimization metrics documentation](https://www.comet.com/development/optimization-runs/optimization/define_metrics#include-cost-and-duration-metrics). - **Training and Validation Dataset Support** - Introduced support for training and validation dataset splits, enabling better optimization workflows. Learn more in the [dataset documentation](https://www.comet.com/development/optimization-runs/optimization/define_datasets#trainvalidation-splits). - **Example Scripts for Microsoft Agents and CrewAI** - New example scripts demonstrating how to use Opik Optimizer with popular LLM frameworks. Check out the [example scripts](https://github.com/comet-ml/opik/tree/main/sdks/opik_optimizer/scripts/llm_frameworks). - **UI Enhancements and Optimizer Improvements** - Several UI enhancements and various improvements to Few Shot, MetaPrompt, and GEPA optimizers for better usability and performance. ## 🎨 User Experience Enhancements Improved usability across the platform: - **Added `has_tool_spans` Field to Show Tool Calls in Thread View** - Tool calls are now visible in thread views, providing better visibility into agent tool usage. - **Added Export Capability (JSON/CSV) Directly from Trace, Thread, and Span Detail Views** - Export data directly from detail views in JSON or CSV format, making it easier to analyze and share your observability data. ## 🤖 New Models! Expanded model support: - **Added Support for Gemini 3 Pro, GPT 5.1, OpenRouter Models** - Added support for the latest model versions including Gemini 3 Pro, GPT 5.1, and OpenRouter models, giving you access to the newest AI capabilities. *** And much more! 👉 [See full commit log on GitHub](https://github.com/comet-ml/opik/compare/1.9.17...1.9.40) _Releases_: `1.9.18`, `1.9.19`, `1.9.20`, `1.9.21`, `1.9.22`, `1.9.23`, `1.9.25`, `1.9.26`, `1.9.27`, `1.9.28`, `1.9.29`, `1.9.31`, `1.9.32`, `1.9.33`, `1.9.34`, `1.9.35`, `1.9.36`, `1.9.37`, `1.9.38`, `1.9.39`, `1.9.40` ## Related pages - [Changelog 2026 09 21](./getting-started-changelog-2026-09-21.md) - [Changelog 2026 09 14](./getting-started-changelog-2026-09-14.md) - [Changelog 2026 09 07](./getting-started-changelog-2026-09-07.md) - [Changelog 2026 08 31](./getting-started-changelog-2026-08-31.md) - [Changelog 2026 08 24](./getting-started-changelog-2026-08-24.md) - [Changelog 2026 08 17](./getting-started-changelog-2026-08-17.md) - [Changelog 2026 08 10](./getting-started-changelog-2026-08-10.md) - [Changelog 2026 07 20](./getting-started-changelog-2026-07-20.md) - [Changelog 2026 07 13](./getting-started-changelog-2026-07-13.md) - [Changelog 2026 07 06](./getting-started-changelog-2026-07-06.md) # Agent Instructions Cite this page’s canonical URL and keep its documentation version. 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