This listing is posted by the APIs.io catalog. APIs.io does not own or sell this API; you get access from the provider, OpenAI.
The OpenAI Responses API is a set of 6 operations for responses, part of OpenAI's REST API at https://api.openai.com/v1. OpenAI's wider platform covers text and reasoning, embeddings, images, audio and speech, video, moderation, file storage, vector stores and file search, fine-tuning, evals and organization administration. Developers building text, reasoning or agent features into their own applications would use it. Authentication is a project-scoped bearer API key, and first-party SDKs exist for Python, JavaScript, Go, Java, .NET and Ruby.
Published for this API: OpenAPI, Documentation, JSON-LD and JSON Schema. The provider publishes its OpenAPI 3.1.0 contract under MIT at github.com/openai/openai-openapi.
Provider scores in the APIs.io catalog: Kin Score 84.4 (exemplar band). Agent Readiness 57.1 (agent-native band), scored 2026-10-17.
Pricing: set by the provider. The catalog marks access as paid.
Condition: a live hosted API, listed in the APIs.io catalog.
Catalog listing: https://apis.io/apis/openai/openai-responses-api/ Provider: https://openai.com/