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OpenAPI Generator

DEVOPS
Velocity5.0

Generates API clients, server stubs and documentation from OpenAPI specs

openapi-generator.tech ↗

OpenAPI Generator holds a 240-change cadence across forty-odd language targets.

code generationopenapipolyglot sdksmaven pluginspec normalisation
◆Current state
The project ships stable releases every four to eight weeks, each carrying 150 to 240 enhancements and fixes spread across generators for C#, Dart, Go, Java, Kotlin, C++, Crystal and dozens more. 7.25.0 follows the pattern: a parser update, restored schemaMapping imports in API interfaces, a stable input-spec hash for the Maven plugin, a way for clients to inject vendor overrides, and splitOperationsByContentType. Every recent release is labelled as carrying breaking changes with fallbacks.
◆Where it's heading
Two constants govern this feed. The core keeps absorbing OpenAPI 3.1 semantics - null handling, map normalisation, any-type with additional properties, allOf members alongside validation keywords - while the per-language generators take independent fixes from their own maintainers. Shipping breaking changes with fallbacks is how a project with this many downstream consumers avoids forcing coordinated upgrades, and it has held for at least six releases.
◆Prediction
OpenAPI 3.1 normalisation has produced fixes in every release for months and is still doing so, so expect that work to continue rather than conclude.

◆Recent moves

  1. 2mo ago

    7.25.0: vendor override injection and 240+ fixes across generators

    A routine stable release with 240+ changes. The generally applicable items are vendor override injection for clients, splitOperationsByContentType, a stable hash for detecting spec changes in the Maven plugin, and further 3.1 normalisation; the rest is per-language maintenance.

    View source ↗
  2. 3mo ago

    7.24.0: discriminator introspection and OAS 3.1 nullable fixes

    170+ changes led by discriminator introspection for oneOf and allOf polymorphic structures, OAS 3.1 nullable normalisation, and a deep merge mode for spec merging with configurable conflict resolution.

    View source ↗
  3. 3mo ago

    7.23.0: JAX-RS security annotations and Kotlin naming break, with fallbacks

    Two named breaking changes, both with fallbacks: JAX-RS and Quarkus security annotations get emitted for empty-scope auth schemes, and Kotlin naming switches to the global prefix and suffix settings.

    View source ↗
  4. 6mo ago

    7.22.0: oneOf discriminator mapping and template manager fix

    150+ changes including a new normaliser that replaces oneOf by discriminator mapping, and a fix for a stream-closed race on concurrent JAR access in the template manager.

    View source ↗
  5. 6mo ago

    7.21.0: Spring Boot 3 becomes the default

    Spring Boot 3 becomes the default target for the Java generators - a version-default change that quietly moves what a fresh generation produces for a large share of users.

    View source ↗
  6. 8mo ago

    7.20.0: Terraform provider and C++ httplib generators

    New Terraform provider and C++ httplib generators join the roster. Target breadth is this project's core value, and each addition extends it without changing the tool's shape.

    View source ↗