> ## Documentation Index
> Fetch the complete documentation index at: https://docs.coreweave.com/llms.txt
> Use this file to discover all available pages before exploring further.

# January 30, 2026 - CoreWeave AI Object Storage RenameObject API

> CoreWeave AI Object Storage now supports atomic object renaming with the RenameObject API

CoreWeave AI Object Storage now supports the RenameObject API, providing atomic, server-side rename operations for objects within the same bucket. RenameObject updates index entries instead of copying data, so rename operations complete in milliseconds regardless of object size.

## Overview

The RenameObject API provides a simpler and more efficient alternative to copy-and-delete workflows. Key benefits include:

* **Atomic operation**: No window where both keys exist simultaneously
* **No data movement**: Updates metadata only, avoiding copy latency and temporary storage duplication
* **Metadata preservation**: Encryption settings, storage billing tier, checksums, and other attributes are preserved
* **Precondition support**: ETag and time-based conditions guard against race conditions and accidental overwrites

## Use cases

| Use case                 | Description                                                              |
| ------------------------ | ------------------------------------------------------------------------ |
| **Checkpoint promotion** | Rename temporary checkpoints to final names after training runs complete |
| **Batch finalization**   | Move artifacts from staging prefixes to final locations after validation |
| **Log rotation**         | Atomically "lock" time-based prefixes by renaming to finalized paths     |

## Limitations

* Same bucket only: cross-bucket rename is not supported
* Versioning not supported: buckets with versioning enabled or previously enabled cannot use RenameObject
* Single object per request: prefix-level rename must be implemented as client-side batches

## Learn more

* See the [Rename Objects guide](/products/storage/object-storage/buckets/rename-objects) for an end-to-end walkthrough with examples
* See the [RenameObject API reference](/products/storage/object-storage/reference/object-storage-s3#s3renameobject) for S3 compatibility details
* See [conditional writes (March 23, 2026)](/changelog/release-notes/ai-object-storage-conditional-writes) for the same precondition pattern on PutObject, CompleteMultipartUpload, and CopyObject