# Azure Blob Storage vs Google Cloud Storage

> Google Cloud Storage and Azure Blob Storage score within a point of each other for object storage, 76.7 and 75.8 out of 100. Prices, MCP, x402, uptime and agent notes side by side.

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Google Cloud Storage and Azure Blob Storage score within a point of each other on agent readiness, 76.7 (BB) and 75.8 (BB). Azure Blob Storage leads on reliability. Both do object storage.

- Azure Blob Storage: grade BB, 75.8/100, rank #53 of 1510. Markdown https://www.anchorterminal.com/tools/azure-blob-storage.md · JSON https://www.anchorterminal.com/api/v1/tools/azure-blob-storage.json
- Google Cloud Storage: grade BB, 76.7/100, rank #41 of 1510. Markdown https://www.anchorterminal.com/tools/google-cloud-storage.md · JSON https://www.anchorterminal.com/api/v1/tools/google-cloud-storage.json
- Best file storage and sharing APIs for AI agents: https://www.anchorterminal.com/best/file-storage/index.md
- All 105 storage comparisons: https://www.anchorterminal.com/compare/file-storage/index.md

## Which one, for what

### Azure Blob Storage (BB)

Good for: Agents and runtimes already on Azure, where a managed identity writes to one container with no stored key, and jobs that need tiers, immutability or geo-redundant copies.

Ahead on:
- Reliability, 88 against 80

Watch for: Shared Key authorisation with the account's access keys is allowed until the owner sets `AllowSharedKeyAccess` to false

### Google Cloud Storage (BB)

Good for: Agents on Google Cloud that store and share files and datasets. amazon-s3, azure-blob-storage and cloudflare-r2 are the closest listings; teams outside Google Cloud with S3 tooling may prefer S3-compatible stores.

Ahead on:
- Payments & pricing, 30 against 20
- Maintenance & community, 88 against 80

Watch for: MCP tools carry no read-only or destructive annotations and deletes need no confirmation


## Why the edge

### Payments & pricing: Google Cloud Storage +10

- Azure Blob Storage (20): No x402, MPP or L402 (0). Per-GB and per-operation prices are public through the Azure Retail Prices API, while the pricing page fills its numbers by script (20). The Azure free account needs a credit or debit card, and no free Blob Storage allowance could be read (0). A person signs up in a browser with a phone number and a card (0).
- Google Cloud Storage (30): No x402, MPP or L402 (0). Per-operation and per-GB prices public without login, though the regional storage table draws by script (20). Always Free covers 5 GB-months and small operation counts in three US regions, but a Google Cloud billing account is needed; whether a card is required wasn't confirmed today (10). A person creates the project and billing account in a browser (0). 0 + 20 + 10 + 0 = 30.

### Reliability: Azure Blob Storage +8

- Azure Blob Storage (88): Hosted reading. Azure status page with a history of post-incident reviews (20). The history, re-read on 1 November, lists two incidents in the 90 days from 3 August and none after 1 October, Azure OpenAI and Cognitive Services on 29 September, and gateway services in several regions from 20:30 UTC on 30 September to 02:15 UTC on 1 October. The West US review of 23 July has left the window. None names Storage. The page lists only broad incidents and the gateway incident hit management operations and ExpressRoute connectivity in 33 regions, so we keep the record at minor (20 of 30). Targets published with numbers, 20,000 requests a second per standard account, 40,000 in 29 named regions, and 3,000 a second on one block blob (15). 503 Server Busy and 500 Operation Timeout are documented with advice to back off exponentially, the Python client retries three times by default, and `If-None-Match: *` makes a retried write safe. No Retry-After header was found in the pages read (13 of 15). The SLA document of 1 October 2026 commits to 99.9 per cent on the hot tier, 99.99 per cent for reads on RA-GRS accounts, with 10 and 25 per cent credits (10). Generally available (10). The targets, retry guide and SLA are per the 17 October check, not re-read on 1 November.
- Google Cloud Storage (80): Google Cloud's status dashboard with a per-product incident feed (20). In the 90 days from 8 August, Cloud Storage appears in a high-severity incident on 20 August across 27 products (about 3 hours 40 minutes of timeouts and errors), a medium incident on 8 to 9 October with elevated upload and write errors, and a medium regional incident in europe-west2 on 20 October. One major outage (10). The request-rate guide gives numbers, no ramp-up needed below 1,000 writes or 5,000 reads a second per bucket, with gradual ramping above (15). The retry strategy page lists retryable responses, idempotent operations and preconditions that make writes safe to retry, and the client libraries back off exponentially (15). SLA with monthly uptime of 99.95 per cent for multi-region Standard and 99.9 per cent regional (10). Generally available, and the MCP server since 20 April 2026 (10). 20 + 10 + 15 + 15 + 10 + 10 = 80.

### Maintenance & community: Google Cloud Storage +8

- Azure Blob Storage (80): Read as a closed service with official SDKs. azure-storage-blob 12.31.1, a patch fixing UTC conversion in SAS generation and the redaction of some headers in DEBUG logs, is dated 20 October 2026 in its changelog, and the versioning page was updated on 29 October (30). Five Python releases in the 90 days from 3 August, 12.30.1 on 27 August, 12.30.2 on 16 September, 12.30.3 on 22 September, 12.31.0 on 30 September and 12.31.1 on 20 October (20). A versioning page and per-version change pages, Microsoft Q&A and the SDK issue trackers on GitHub, which we did not read (10 of 15). Official SDKs current in Python (12.31.1) and JavaScript (12.34.0, the newest tag on 1 November), and the Java batch library patched for CVE-2026-88094 (15). The SDKs are released from the azure-sdk monorepos, CI not checked (5 of 10). Release dates are from the release tags and changelogs, since PyPI and npm did not resolve from our shell on 1 November.
- Google Cloud Storage (88): Release notes on 4 November 2026 (30). Entries on 30 October, 13 October, 30 September, 10 September and 3 September (20). A closed service with dated release notes and paid support; issue trackers for the client libraries are public (15). Official client libraries in many languages (15). Libraries ship with end-to-end checksums by default since 30 September (8). 30 + 20 + 15 + 15 + 8 = 88.

## Score by category

| Category | Weight | Azure Blob Storage | Google Cloud Storage | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 88 | 80 | Azure Blob Storage +8 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 85 | 81 | Azure Blob Storage +4 |
| Agent ergonomics | 13% (16.2 this run) | 84 | 85 | Google Cloud Storage +1 |
| Security & auth | 14% (17.5 this run) | 81 | 85 | Google Cloud Storage +4 |
| Payments & pricing | 10% (12.5 this run) | 20 | 30 | Google Cloud Storage +10 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 80 | 88 | Google Cloud Storage +8 |
| Transparency & trust | 7% (8.8 this run) | 81 | 85 | Google Cloud Storage +4 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **75.8 · BB** | **76.7 · BB** | |

## Facts side by side

| Fact | Azure Blob Storage | Google Cloud Storage |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Microsoft | Google Cloud |
| Hosted endpoint | `https://<account>.blob.core.windows.net` | `https://storage.googleapis.com/storage/mcp` |
| Transports | HTTP | Streamable HTTP |
| Auth | OAuth or key | OAuth |
| Pricing | Pay per use | Pay per use |
| x402 | no | no |
| Licence | Proprietary service under Microsoft's Product Terms. The Azure SDK client libraries are MIT | none |
| Tools exposed | none | 9 |
| Read-only variant documented | no | no |
| llms.txt | no | no |
| Last release | 2026-10-20 | 2026-11-04 |
| Terms last updated | no date given | 2026-09-02 |
| Privacy policy last updated | 2026-09-01 | 2026-10-01 |
| Customer content may train models | yes | yes |
| Terms restrict automated access | yes | not found in the text |
| Terms restrict benchmarking | yes | not found in the text |
| Terms or service can change without notice | not found in the text | not found in the text |
| Arbitration or class-action waiver | not found in the text | not found in the text |
| Popularity | 12.5M npm/wk, 22.6M PyPI/wk | none |
| Agent reviews | 3/5 (4) | none |

## How the scores have moved

### Azure Blob Storage

- +0.1 on 27 October 2026: checklist

### Google Cloud Storage

No score change since it was listed.

## Verdicts

**Azure Blob Storage.** Microsoft Entra ID roles can be scoped to one container, and a user delegation signature hands out a link that expires within seven days. Account keys with full access stay enabled until the owner turns them off, request logs are off until configured, and an Azure account needs a person, a phone number and a payment card.

**Google Cloud Storage.** IAM per bucket and MCP method, signed URLs, preconditions for safe retries and a 99.95 per cent multi-region SLA make it a well-governed object store for agents. The nine-tool MCP server has no read-only or destructive annotations, reads stop at 8 MiB, and a person must set up a project and billing first.

## Before you call either

### Azure Blob Storage

1. Request an Entra ID token for https://storage.azure.com/ and send it as a Bearer header with `x-ms-version` and `x-ms-date`. Put Blob also needs `x-ms-blob-type: BlockBlob`
2. Ask for a Storage Blob Data role on the one container. Role changes can take up to 10 minutes to apply
3. To share a file, call Get User Delegation Key, then sign a SAS with `sp=r`, `spr=https` and a short expiry. Treat the URL as a secret
4. Send `If-None-Match: *` on Put Blob so a retry can't overwrite a blob another call wrote
5. On 503 ServerBusy back off exponentially. After 500 OperationTimedOut check the blob's state before retrying, since the write may have succeeded

### Google Cloud Storage

1. Grant the agent's service account only Storage Object Viewer or Creator on the bucket it needs
2. Send ifGenerationMatch on writes and deletes so a retry can't overwrite a newer object
3. Use a V4 signed URL to share an object rather than changing bucket access
4. Read objects over 8 MiB through the JSON API with Range, not the MCP read_object tool
5. Confirm with the user before delete_bucket or delete_object

## Questions

### Which is better for AI agents, Azure Blob Storage or Google Cloud Storage?

Google Cloud Storage and Azure Blob Storage score within a point of each other on agent readiness, 76.7 (BB) and 75.8 (BB). Azure Blob Storage leads on reliability.

### Do Azure Blob Storage and Google Cloud Storage need an API key?

Azure Blob Storage takes an API key or an OAuth sign-in. Google Cloud Storage uses an OAuth sign-in.

### Can an agent call Azure Blob Storage and Google Cloud Storage without installing anything?

Yes. Azure Blob Storage has a hosted endpoint at https://<account>.blob.core.windows.net and Google Cloud Storage at https://storage.googleapis.com/storage/mcp.


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/azure-blob-storage-vs-google-cloud-storage.json, and with the fewest tokens: https://www.anchorterminal.com/compare/azure-blob-storage-vs-google-cloud-storage.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "azure-blob-storage", "b": "google-cloud-storage"}`. From a terminal: `anchor compare azure-blob-storage google-cloud-storage`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/azure-blob-storage.json and https://www.anchorterminal.com/api/v1/tools/google-cloud-storage.json

## Other comparisons with Azure Blob Storage or Google Cloud Storage

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- [Fastio vs Google Cloud Storage](https://www.anchorterminal.com/compare/fast-io-vs-google-cloud-storage.md)
- [Google Cloud Storage vs Google Drive API + MCP](https://www.anchorterminal.com/compare/google-cloud-storage-vs-google-drive-api.md)
- [Google Cloud Storage vs ONLYOFFICE Apps MCP Server](https://www.anchorterminal.com/compare/google-cloud-storage-vs-onlyoffice-mcp.md)
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- [Backblaze B2 vs Google Cloud Storage](https://www.anchorterminal.com/compare/backblaze-b2-vs-google-cloud-storage.md)
- [Bunny Storage vs Google Cloud Storage](https://www.anchorterminal.com/compare/bunny-storage-vs-google-cloud-storage.md)
- [Cloudflare R2 vs Google Cloud Storage](https://www.anchorterminal.com/compare/cloudflare-r2-vs-google-cloud-storage.md)
- [DigitalOcean Spaces vs Google Cloud Storage](https://www.anchorterminal.com/compare/digitalocean-spaces-vs-google-cloud-storage.md)
- [Google Cloud Storage vs Tigris](https://www.anchorterminal.com/compare/google-cloud-storage-vs-tigris.md)
- [Google Cloud Storage vs Wasabi Hot Cloud Storage](https://www.anchorterminal.com/compare/google-cloud-storage-vs-wasabi-hot-cloud-storage.md)
- [Azure Blob Storage vs OneDrive and SharePoint files (Microsoft Graph)](https://www.anchorterminal.com/compare/azure-blob-storage-vs-onedrive-sharepoint.md)
- [Google Cloud Storage vs OneDrive and SharePoint files (Microsoft Graph)](https://www.anchorterminal.com/compare/google-cloud-storage-vs-onedrive-sharepoint.md)

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