Object storage · October 2026 Edition
Amazon S3 vs Azure Blob Storage
Three of fourteen models named Amazon S3 first on the direct prompt; one named Azure Blob Storage. Amazon S3 was named by fourteen of the fourteen models and Azure Blob Storage by thirteen and Amazon S3 carries 67 labels and Azure Blob Storage 42, so the shares are not directly comparable.
Named in four categories this edition.
Named in one category this edition.
First-choice share12%6%Of first choices across the direct, paraphrase, budget and scale prompts, 0 to 100.
Negative rate34%31%Negative labels as a share of the product's labels, 0 to 100.
Rank in category#3#5A position in a field of 9; printed, not drawn.
Labels6742A count; the two differ.
The two percentage rows are drawn on one 0 to 100 track, Amazon S3 reading right to left. Rank and label count are printed, not drawn.Backblaze B2 was named alongside these two in ten of the fourteen direct answers. Backblaze B2 vs Amazon S3 · Backblaze B2 vs Azure Blob Storage · Cloudflare R2 vs Amazon S3
Share is the count of first choices across the direct, paraphrase, budget and scale prompts over all fourteen models, for a mid-market B2B company; rank is within the category; every quote names the model and the prompt it came from. Both figures come from the object storage page.
By framing
How many of the fourteen models made each the first choice, per way of asking, and how many argued against it.
Amazon S3First choices, of fourteen modelsAzure Blob Storage
Direct314 against Amazon S3 · 1 against Azure Blob Storage
Paraphrase105 against Amazon S3 · 1 against Azure Blob Storage
Comparative110
Budget-constrained005 against Amazon S3 · 3 against Azure Blob Storage
Scale-constrained22
Negative109 against Amazon S3 · 7 against Azure Blob Storage
Bars are first choices, 0 to 14 each sideModels that argued againstA model can name both, so the two sides of a row do not sum to fourteen.
Across every category in the October 2026 Edition, Amazon S3 and Azure Blob Storage were named in the same answer 124 times, of the 215 answers naming Amazon S3 and the 129 naming Azure Blob Storage. In those answers Azure Blob Storage took the first choice one time and Amazon S3 thirty-nine.
Every model, every framing
The eighty-four answers behind the chart above, one cell each: where Amazon S3 and Azure Blob Storage stood in it.
| Model | Direct | Paraphrase | Comparative | Budget-constrained | Scale-constrained | Negative |
|---|---|---|---|---|---|---|
| Claude Haiku 4.5 | ||||||
| GPT-5.4 mini | | | | |||
| Gemini 3.5 Flash | | | | | | |
| Perplexity Sonar | | | | | ||
| Grok 4.1 Fast | | | | | | |
| Mistral Small | | | | |||
| DeepSeek V4 Flash | | | | | ||
| Llama 4 Maverick | | | ||||
| Qwen 3.7 Flash | | | | | | |
| Kimi K2 | | | | | | |
| GLM 4.7 FlashX | | | | | ||
| MiniMax M2.5 | | | | |||
| GPT-6 Luna | | | | | ||
| Muse Glimmer 30B | | | |
Amazon S3 Azure Blob Storage first choice named as an alternative argued againstblank: not namedEach cell is one answer, Amazon S3 on the left and Azure Blob Storage on the right.The direct prompt
The plain question, one answer per model, grouped by where Amazon S3 and Azure Blob Storage stood in it.
Both were the first choice
1 of 14 modelsThe answer named them together, and the judge labeled each a first choice.MiniMax M2.5Amazon S3, Azure Blob Storage alternatives: Backblaze B2, Google Cloud Storage, Wasabi Object Storage
Amazon S3 first, Azure Blob Storage an alternative
2 of 14 modelsAzure Blob Storage was named in the answer but not as the choice, or not at all.GPT-5.4 miniAmazon S3 alternatives: Azure Blob Storage, Google Cloud Storage
GPT-6 LunaAmazon S3 alternatives: Azure Blob Storage, Cloudflare R2, Google Cloud Storage
Neither was the first choice, one was named
6 of 14 modelsThe answer put something else first and named one of the two as an alternative.Perplexity SonarGoogle Cloud Storage alternatives: Amazon S3, Backblaze B2, Wasabi Object Storage
Mistral SmallBackblaze B2 alternatives: Amazon S3, Cloudian HyperStore
DeepSeek V4 FlashBackblaze B2 alternatives: Amazon S3, Cloudflare R2
Kimi K2Cloudflare R2 alternatives: Azure Blob Storage, Backblaze B2, Google Cloud Storage
GLM 4.7 FlashXBackblaze B2 alternatives: Amazon S3, Cloudflare R2, MinIO AIStor, Wasabi Object Storage
Muse Glimmer 30Bno first choice alternatives: Amazon S3, Backblaze B2, Cloudflare R2, Wasabi Object Storage
Neither was named
5 of 14 modelsThe answer made no first choice from these two in this category.Claude Haiku 4.5no first choice
Gemini 3.5 FlashCloudflare R2 alternatives: Backblaze B2, Wasabi Object Storage
Grok 4.1 FastBackblaze B2 alternatives: Cloudflare R2, Wasabi Object Storage
Llama 4 Maverickno first choice
Qwen 3.7 FlashBackblaze B2, Wasabi Object Storage
Bold names in an answer are the products the judge labeled a first choice; a model naming several gives each of them that label. The full answer text for every row is in the record.
By buyer segment
The same question asked on behalf of a different buyer. Each standing is computed within its segment and they are never added together. The figures above are the mid-market standing, which is the one the category orders by.
Small business
Amazon S3 leads by five points.
Amazon S35%#5 of 9Azure Blob Storage0%#9 of 9Mid-marketThe figures above
Amazon S3 leads by six points.
Amazon S312%#3 of 9Azure Blob Storage6%#5 of 9Enterprise
Amazon S3 leads by thirty-eight points.
Amazon S344%#1 of 12Azure Blob Storage6%#4 of 12What the models said about Amazon S3
Every negative label with a quote, up to three, then the highest-weighted positives, up to three. Six of eight in this category shown.
“Avoid hyperscalers (AWS/GCP/Azure) on tight budgets due to egress/API add-ons.” Grok 4.1 Fast · budget prompt · hard negative
“Traditional hyperscalers like AWS S3 are incredibly powerful but often punish growing mid-sized companies with unpredictable API transaction fees and steep "egress taxes"” Gemini 3.5 Flash · paraphrase prompt · soft negative
“Be cautious if… You're comparing only the per-GB storage price. Requests, retrievals, transfers, replication, and archive-tier rules can also affect the bill” GPT-6 Luna · negative prompt · soft negative
“Best for: Enterprise workloads, S3-native applications... AWS S3, Azure Blob, and GCS offer the most comprehensive feature sets” GLM 4.7 FlashX · comparative prompt · first choice
“If you want one answer without more context: choose Amazon S3 unless your company is already standardized on Azure or GCP.” GPT-5.4 mini · direct prompt · first choice
“The industry standard. Most third-party tools default to S3 compatibility because it has the largest ecosystem” Qwen 3.7 Flash · comparative prompt · first choice
What the models said about Azure Blob Storage
Every negative label with a quote, up to three, then the highest-weighted positives, up to three. Six of eight in this category shown.
“"avoid or be cautious about ... those with high egress fees or minimum retention periods, such as GCS and Azure Cold"” Muse Glimmer 30B · negative prompt · hard negative
“Avoid hyperscalers (AWS/GCP/Azure) on tight budgets due to egress/API add-ons.” Grok 4.1 Fast · budget prompt · hard negative
“High egress fees (e.g., AWS S3: $0.09/GB after free tier; GCS/Azure similar) lead to unpredictable bills and vendor lock-in” Grok 4.1 Fast · negative prompt · soft negative
“Start with AWS S3 or Azure Blob — native integration, massive ecosystem, but watch egress costs.” DeepSeek V4 Flash · scale prompt · first choice
“I'd recommend Amazon S3 or Azure Blob Storage due to their enterprise-grade security” MiniMax M2.5 · direct prompt · first choice
“Check AWS S3 / Azure Blob: If you are already deep in one ecosystem.” Qwen 3.7 Flash · scale prompt · first choice
Also compared
Backblaze B2 vs Amazon S3Backblaze B2 vs Azure Blob StorageCloudflare R2 vs Amazon S3Cloudflare R2 vs Azure Blob StorageAmazon S3 vs Wasabi Object StorageAmazon S3 vs DigitalOcean SpacesAmazon S3 vs Google Cloud StorageAmazon S3 vs Cloudian HyperStoreWasabi Object Storage vs Azure Blob StorageAzure Blob Storage vs DigitalOcean SpacesAzure Blob Storage vs Google Cloud StorageAzure Blob Storage vs Cloudian HyperStoreAll twenty-eight head-to-head pages and the full object storage standing
Comparisons are drawn for the top eight products in each category, each against each. The output is the models' output; nothing here is a recommendation by the index.