> For the complete documentation index, see [llms.txt](https://docs.coherent.global/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.coherent.global/whats-new/release-history/2026-04.md).

# 2026-04

| UAT release    | Production release |
| -------------- | ------------------ |
| April 27, 2026 | May 11, 2026       |

This month we are releasing a long-requested feature to edit existing Spark service versions. We also have a number of enhancements that improve the performance and usability on the platform.

## Edit existing Spark service versions

Make changes to a Spark service even after it has been published!

Spark services have historically been "locked-in" after a version has been created. Any changes to an existing version would require a new version to be created. In this update, we include the ability to edit a service version without having to create another version.

This makes it easy to add information that was missed at the time of upload or test different configuration values. This supplements the ability to delete service version from the prior release.

## Notable Enhancements

* Improved Xcall performance if a specific service version number is specified.
* Even faster publish time for Spark services.
* API Call History quicker user interface and query response for complex queries.
* API Tester OpenAPI code snippets are much more comprehensive.
* Testing Center Testbed Comparison is moved to a background activity to minimize impacts to Spark session.
* Batch improved stability for high chunk counts.
* API Call History and Testing Center, Excel downloads that include expanded tables now have support for long input and output names.
* Coherent Assistant service upload includes additional fields for release notes and description.
* Homepage and Folder overview UI adjustments for consistent pagination.
* MCP authentication flow is greatly simplified and MCP tool updates. See [Model Context Protocol (MCP)](/integrations/model-context-protocol-mcp.md) for more details!
* Fixed an issue with API keys including `tenant-admin` group. Note this is not a recommended pattern but partially supported for compatibility.
* Security patch updates to addresses vulnerabilities, ensuring enhanced protection and stability of our systems.

## Version number

`v8.52.0`


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