# Azure OpenAI vs OpenAI API: who uses which

On usedby, 3 companies use Azure OpenAI and 45 use OpenAI API. 1 company uses both, including DocsBot. Counts include every proof level, job-post signals included; each company keeps its proof level on each side. Latest check 2026-11-14: 47 of 48 public lines checked.

## Side by side

|  | [Azure OpenAI](https://www.usedby.ai/tools/azure-openai.md) | [OpenAI API](https://www.usedby.ai/tools/openai-api.md) |
|---|---|---|
| Public customers | 3 | 45 |
| Confirmed | 0 | 4 |
| Observed | 0 | 33 |
| Signals (job posts) | 1 | 2 |
| Top industries of customers (every proof level) | Artificial Intelligence (2), Legal & Compliance (1) | Artificial Intelligence (10), DevTools & Infrastructure (5), Marketplace (4) |
| Category | Foundation models & model APIs | Foundation models & model APIs |
| Security | — | OpenAI API · ISO 27001, ISO 27701 OpenAI API · SOC 2 Type II ([openai.com](https://openai.com/security-and-privacy/), checked 2026-11-13) |
| Pricing | — | gpt-6-astra · standard, short context · Per 1M tokens: $10 input, $1 cached input, $12.50 cache writes, $50 output gpt-6.1-sol · standard, short context · Per 1M tokens: $2 input, $0.10 cached input, $2.50 cache writes, $10 output gpt-6-luna · standard, short context · Per 1M tokens: $0.10 input, $0.01 cached input, $0.125 cache writes, $0.50 output ([platform.openai.com](https://platform.openai.com/pricing/), checked 2026-11-13) |

## Companies that use both

Every proof level counts; the proof level of each side is shown, strongest proofs first. The first public proof is not an adoption date.

| Company | Proof, Azure OpenAI | Proof, OpenAI API | First public proof, Azure OpenAI | First public proof, OpenAI API |
|---|---|---|---|---|
| [DocsBot](https://www.usedby.ai/companies/docsbot.md) | Declared by the company | Declared by the company | On or before November 2026 | On or before November 2026 |

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Source: https://www.usedby.ai/compare/azure-openai-vs-openai-api · How we check: https://www.usedby.ai/methodology