OpenAI vs Azure OpenAI Service

OpenAI's listed ChatGPT plans range from Free to paid subscriptions: Go is $8/month, Plus $20, and Pro tiers $100, $200, or $500/month. ChatGPT Business Standard is $25 per user monthly or $20 per user with annual billing; Premium is $125 monthly or $100 annually. Enterprise and Edu use custom pricing. These are ChatGPT prices, not API rates. The pricing facts list monthly API credits of $100, $200, or $500 for the corresponding Pro tiers; ask OpenAI what API usage those credits cover and what additional usage costs.

Azure OpenAI has no published token or PTU-hour prices in the pricing facts. Standard bills per token, Provisioned per PTU-hour, and Batch API receives a 50% discount on Global Standard pricing. Batch completions are returned within 24 hours. A general Azure Free Account offers $200 credit for 30 days; that is not a dedicated Azure OpenAI free plan. Estimate costs from your model, traffic and quota needs before launch.

OpenAI's homepage lists an API Platform alongside ChatGPT and promotes ChatGPT Business. It does not describe API protocols, request formats or a build workflow. Azure lists Azure OpenAI within Foundry Models, alongside Foundry Agent Service and Foundry Tools. Microsoft describes Foundry as a place to build, evaluate and deploy generative AI solutions; Foundry Models supports model selection from exploration through deployment. That gives Azure a visible integration path through Foundry, but the homepage does not give Azure OpenAI-specific model details.

Neither homepage specifies SDK packages, supported programming languages or CLI commands. Microsoft's Azure homepage links to documentation and developer resources; OpenAI's homepage presents the API Platform but does not link to API documentation in the listed navigation. The OpenAI homepage links to a Zapier customer story, not an integrations catalogue. Before choosing, verify SDK availability, authentication, endpoint compatibility and migration requirements in the vendor documentation for the specific models and services you plan to use.

Neither homepage describes an open-source licence, a self-hosting option or data-export terms. OpenAI presents ChatGPT and an API Platform; Azure OpenAI is presented as a service within Microsoft Foundry. Those product descriptions do not establish whether model weights can be downloaded, whether either service can run outside its provider's environment, or what export mechanisms are available.

Treat provider-specific APIs, model behavior and account controls as potential migration work, not as interchangeable interfaces. Before committing, ask each vendor about data export formats, retention and deletion, model availability outside the service, and the cost of moving prompts, evaluations and application logic. Keep provider calls behind an application interface and store prompts and evaluation data in formats your team can move. These are engineering precautions, not guarantees that either vendor supports a particular export or migration path.