OpenAI API
Hosted models for text and image inputs, with Responses API access and client SDKs.
- Verified facts
- 6
- Plans
- —
- Sources
- 2
- Pricing
- Metered usage
Overview
What OpenAI API is for
Hosted models for text and image inputs, with Responses API access and client SDKs.
Read the full editorial overview
When to shortlist it
Compare OpenAI as an API platform when you need hosted models, a Responses interface and SDKs. Choose the exact model separately: the platform catalogue contains different cost and capability profiles.
What to compare before choosing
Budget model tokens and tools separately, then check rate limits and service tier. API availability and billing should be checked for the account that will run the workload; this profile does not establish a consumer-plan entitlement.
Capabilities, rates and tool support vary by model. A model catalogue entry does not establish access through a consumer subscription.
Evidence and buying terms
This profile summarizes the linked official documentation checked on 18 October 2026. It is not a hands-on test or a measured performance ranking. The named plans and model identifiers keep their own scope. Confirm account access, billing terms, taxes and any extra charges before buying.
OpenAI API: official API documentation · Evidence: documentation · Oct 18, 2026
OpenAI API: official API documentation · Evidence: documentation · Oct 18, 2026
Documented facts
Each fact comes from official documentation and shows when it was verified.
Who it is for
Hosted models for text and image inputs, with Responses API access and client SDKs.
Coverage limits
Capabilities, rates and tool support vary by model. A model catalogue entry does not establish access through a consumer subscription.
API interfaces
Responses API and client SDKs
Model catalogue
GPT-6 Astra, GPT-6.1 Sol, GPT-6 Luna
Billing basis
Model-dependent input and output token rates; tools can carry additional charges.
Example rates belong to GPT-6.1 Sol, not every model. See each exact model and its service tier.
Availability
Request and token rate limits depend on the account usage tier.
Documentation check only; this catalogue does not verify access for a particular account.
Applies to the facts above: Official documentation checked on 18 October 2026; no hands-on test.
Not confirmed in our sources
We have not confirmed these terms for OpenAI API in the linked documentation. That does not mean OpenAI API lacks them; confirm them before you rely on them.
- Pricing
- Data controls
Sources & methodology
Facts come from the linked documentation. Documentation checks are not hands-on tests, and readable sources can have incomplete coverage.
Discovered an undocumented discrepancy or pricing shift? Submit a correction request.
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Compare documented scope side by side. Different billing units do not establish a cost winner.
OpenAI API comparisons
Compare two products in the same category using their documented terms and sources.