OpenAI Go is the official Go library for the OpenAI API, maintained by OpenAI for backend developers who build on Go. It provides typed, idiomatic access to the full REST API โ chat completions, the Responses API, embeddings, images, audio, files, fine-tuning and more โ with streaming, structured outputs and tool calling handled in a Go-native style. The repository has around 3,500 stars on GitHub and is updated continuously alongside the API itself in 2026.
The library is generated from OpenAI’s OpenAPI specification with Stainless and then refined with hand-written helpers where Go developers expect them, such as accumulators for streamed chat completions and typed union parameters for multimodal message content. It supports configurable timeouts, retries with backoff, custom HTTP clients and middleware, and it exposes raw responses when you need headers or status codes. Environment-based configuration means the same code reads OPENAI_API_KEY locally and in production. For Go shops, it replaces error-prone hand-rolled HTTP calls with compile-time-checked request and response types for every endpoint, including newer surfaces like realtime sessions, vector stores and batch processing. Semantic versioning, a detailed changelog and API-extensibility guarantees make upgrades predictable for production services that cannot afford surprises.
OpenAI Go is free and open source under the Apache-2.0 license. Usage of the OpenAI API itself is billed by OpenAI under your own account.
OpenAI Go is for Go developers and backend teams who want a supported, type-safe way to integrate OpenAI models into services, CLIs and infrastructure tooling.