Maturity levels
Maturity levels indicate the extent of development on a generation target.
Maturity level
Alpha
Description
An early preview of upcoming features intended for gathering feedback. Alpha versions are less complete and likely to be unstable, with frequent updates and significant changes.
Beta
Description
A stable release version that includes many features of GA but is still ongoing development and customer feedback. Core interfaces are stable and ready for production use.
General availability (GA)
Description
A fully supported release that includes all functionalities altering the type interface from OpenAPI Specification keywords (for example, oneOf).
Feature support levels
Feature support levels indicate the extent of additional functionalities provided.
Target
Maturity level
GA
Feature support level
GA
Maturity level
GA
Feature support level
GA
Maturity level
GA
Feature support level
GA
Maturity level
GA
Feature support level
GA
Maturity level
GA
Feature support level
GA
Maturity level
GA
Feature support level
Level 1
Maturity level
GA
Feature support level
Level 1
Maturity level
Beta
Feature support level
Level 1
Maturity level
GA
Feature support level
Level 2
Postman
Maturity level
Alpha
Feature support level
Level 1
MCP Typescript
Maturity level
Beta
Feature support level
Level 2
Maturity level
Alpha
Feature support level
Level 1
Deprecated generation targets
- TypeScript Beta (v1)
- Java Beta (v1)
SDK Feature Matrix by Category
This document outlines the OpenAPI and SDK features supported by Speakeasy. Features are grouped by category to help quickly locate what’s available per SDK.
Legend:
- ✅ Implemented
- ⚠️ Partially Implemented (missing Readme sections or tests)
- ⛔ Not Implemented
- ➖ Ignored
Note: This is not a complete list. Some SDK features are language-specific or not yet documented here.
Customization Basics
Feature
TypeScript
✅
Go
✅
C#
✅
Ruby
✅
MCP Typescript
✅
Postman
✅
Python
✅
Java
✅
PHP
✅
Terraform
✅
Unity
✅
CLI
✅
TypeScript
✅
Go
✅
C#
✅
Ruby
✅
MCP Typescript
✅
Postman
✅
Python
✅
Java
✅
PHP
✅
Terraform
✅
Unity
✅
CLI
✅
Structure
Feature
TypeScript
✅
Go
✅
C#
✅
Ruby
✅
MCP Typescript
✅
Postman
✅
Python
✅
Java
✅
PHP
✅
Terraform
✅
Unity
✅
CLI
✅
TypeScript
✅
Go
✅
C#
✅
Ruby
✅
MCP Typescript
✅
Postman
✅
Python
✅
Java
✅
PHP
✅
Terraform
✅
Unity
✅
CLI
✅
TypeScript
✅
Go
✅
C#
✅
Ruby
✅
MCP Typescript
✅
Postman
✅
Python
✅
Java
✅
PHP
✅
Terraform
✅
Unity
✅
CLI
✅
TypeScript
✅
Go
✅
C#
✅
Ruby
✅
MCP Typescript
✅
Postman
✅
Python
✅
Java
✅
PHP
✅
Terraform
✅
Unity
✅
CLI
✅
TypeScript
✅
Go
✅
C#
✅
Ruby
✅
MCP Typescript
✅
Postman
✅
Python
✅
Java
✅
PHP
✅
Terraform
✅
Unity
✅
CLI
✅
Data Model
Feature
TypeScript
⛔
Go
⛔
C#
⛔
Ruby
⛔
MCP Typescript
⛔
Postman
⛔
Python
⛔
Java
⛔
PHP
⛔
Terraform
✅
Unity
⛔
CLI
⛔
TypeScript
✅
Go
✅
C#
✅
Ruby
✅
MCP Typescript
✅
Postman
✅
Python
✅
Java
✅
PHP
✅
Terraform
✅
Unity
✅
CLI
✅
TypeScript
✅
Go
✅
C#
✅
Ruby
✅
MCP Typescript
✅
Postman
✅
Python
✅
Java
✅
PHP
✅
Terraform
✅
Unity
✅
CLI
✅
TypeScript
✅
Go
✅
C#
✅
Ruby
✅
MCP Typescript
✅
Postman
✅
Python
✅
Java
✅
PHP
✅
Terraform
✅
Unity
⛔
CLI
✅
TypeScript
✅
Go
✅
C#
✅
Ruby
✅
MCP Typescript
✅
Postman
⛔
Python
✅
Java
✅
PHP
✅
Terraform
⛔
Unity
⛔
CLI
⛔
TypeScript
✅
Go
✅
C#
✅
Ruby
✅
MCP Typescript
✅
Postman
⛔
Python
✅
Java
✅
PHP
✅
Terraform
✅
Unity
✅
CLI
✅
TypeScript
✅
Go
✅
C#
✅
Ruby
✅
MCP Typescript
✅
Postman
✅
Python
✅
Java
✅
PHP
✅
Terraform
⛔
Unity
✅
CLI
✅
TypeScript
✅
Go
✅
C#
✅
Ruby
✅
MCP Typescript
✅
Postman
✅
Python
✅
Java
✅
PHP
✅
Terraform
⛔
Unity
✅
CLI
✅
TypeScript
⛔
Go
⛔
C#
⛔
Ruby
⛔
MCP Typescript
⛔
Postman
⛔
Python
⛔
Java
⛔
PHP
⛔
Terraform
✅
Unity
⛔
CLI
⛔
TypeScript
✅
Go
✅
C#
✅
Ruby
✅
MCP Typescript
✅
Postman
⛔
Python
✅
Java
✅
PHP
✅
Terraform
⛔
Unity
⛔
CLI
✅
TypeScript
✅
Go
✅
C#
✅
Ruby
✅
MCP Typescript
✅
Postman
⛔
Python
✅
Java
✅
PHP
✅
Terraform
✅
Unity
✅
CLI
✅
TypeScript
✅
Go
✅
C#
✅
Ruby
✅
MCP Typescript
✅
Postman
⛔
Python
✅
Java
✅
PHP
⛔
Terraform
⛔
Unity
⛔
CLI
✅
Customize Methods
Feature
TypeScript
⛔
Go
⛔
C#
⛔
Ruby
⛔
MCP Typescript
⛔
Postman
⛔
Python
⛔
Java
⛔
PHP
⛔
Terraform
⛔
Unity
⛔
CLI
⛔
TypeScript
✅
Go
✅
C#
✅
Ruby
✅
MCP Typescript
✅
Postman
⛔
Python
✅
Java
✅
PHP
✅
Terraform
✅
Unity
✅
CLI
✅
TypeScript
✅
Go
✅
C#
✅
Ruby
✅
MCP Typescript
✅
Postman
✅
Python
✅
Java
✅
PHP
✅
Terraform
✅
Unity
✅
CLI
✅
TypeScript
✅
Go
✅
C#
✅
Ruby
✅
MCP Typescript
✅
Postman
✅
Python
✅
Java
✅
PHP
✅
Terraform
✅
Unity
✅
CLI
✅
TypeScript
✅
Go
✅
C#
✅
Ruby
✅
MCP Typescript
✅
Postman
⛔
Python
✅
Java
✅
PHP
✅
Terraform
✅
Unity
⚠️
CLI
✅
TypeScript
✅
Go
✅
C#
✅
Ruby
✅
MCP Typescript
✅
Postman
⛔
Python
✅
Java
✅
PHP
✅
Terraform
✅
Unity
⛔
CLI
✅
TypeScript
✅
Go
✅
C#
✅
Ruby
✅
MCP Typescript
✅
Postman
⛔
Python
✅
Java
⛔
PHP
✅
Terraform
⛔
Unity
⛔
CLI
⛔
TypeScript
✅
Go
✅
C#
✅
Ruby
✅
MCP Typescript
✅
Postman
⛔
Python
✅
Java
⛔
PHP
✅
Terraform
✅
Unity
⛔
CLI
⛔
TypeScript
✅
Go
✅
C#
✅
Ruby
✅
MCP Typescript
✅
Postman
⛔
Python
✅
Java
⛔
PHP
✅
Terraform
✅
Unity
⛔
CLI
⛔
Responses & Error Handling
Feature
TypeScript
⛔
Go
✅
C#
⛔
Ruby
⛔
MCP Typescript
⛔
Postman
✅
Python
✅
Java
⛔
PHP
⛔
Terraform
✅
Unity
✅
CLI
✅
TypeScript
✅
Go
✅
C#
✅
Ruby
✅
MCP Typescript
✅
Postman
⛔
Python
✅
Java
✅
PHP
✅
Terraform
✅
Unity
✅
CLI
✅
TypeScript
✅
Go
✅
C#
✅
Ruby
✅
MCP Typescript
✅
Postman
✅
Python
✅
Java
✅
PHP
✅
Terraform
⛔
Unity
✅
CLI
✅
TypeScript
✅
Go
✅
C#
✅
Ruby
✅
MCP Typescript
✅
Postman
⛔
Python
✅
Java
✅
PHP
✅
Terraform
⛔
Unity
⛔
CLI
⛔
TypeScript
✅
Go
✅
C#
✅
Ruby
✅
MCP Typescript
✅
Postman
⛔
Python
✅
Java
✅
PHP
✅
Terraform
⛔
Unity
⛔
CLI
✅
TypeScript
✅
Go
✅
C#
✅
Ruby
✅
MCP Typescript
✅
Postman
⛔
Python
✅
Java
✅
PHP
✅
Terraform
⛔
Unity
⛔
CLI
✅
TypeScript
✅
Go
✅
C#
✅
Ruby
✅
MCP Typescript
✅
Postman
⛔
Python
✅
Java
✅
PHP
✅
Terraform
⛔
Unity
⛔
CLI
✅
TypeScript
✅
Go
✅
C#
✅
Ruby
✅
MCP Typescript
✅
Postman
⛔
Python
✅
Java
✅
PHP
✅
Terraform
⛔
Unity
⛔
CLI
✅
Global Parameters
Feature
TypeScript
✅
Go
✅
C#
✅
Ruby
✅
MCP Typescript
✅
Postman
⛔
Python
✅
Java
✅
PHP
✅
Terraform
✅
Unity
⛔
CLI
✅
TypeScript
✅
Go
✅
C#
✅
Ruby
✅
MCP Typescript
✅
Postman
⛔
Python
✅
Java
✅
PHP
✅
Terraform
✅
Unity
⛔
CLI
✅
TypeScript
✅
Go
✅
C#
✅
Ruby
✅
MCP Typescript
✅
Postman
✅
Python
✅
Java
✅
PHP
✅
Terraform
⛔
Unity
⛔
CLI
⛔
TypeScript
⛔
Go
⛔
C#
⛔
Ruby
⛔
MCP Typescript
⛔
Postman
⛔
Python
⛔
Java
⛔
PHP
⛔
Terraform
⛔
Unity
⛔
CLI
⛔
Configure Servers
Feature
TypeScript
✅
Go
✅
C#
✅
Ruby
✅
MCP Typescript
✅
Postman
✅
Python
✅
Java
✅
PHP
✅
Terraform
✅
Unity
✅
CLI
✅
TypeScript
✅
Go
✅
C#
✅
Ruby
✅
MCP Typescript
✅
Postman
⛔
Python
✅
Java
✅
PHP
✅
Terraform
✅
Unity
⛔
CLI
⛔
TypeScript
✅
Go
✅
C#
✅
Ruby
✅
MCP Typescript
✅
Postman
✅
Python
✅
Java
✅
PHP
✅
Terraform
✅
Unity
✅
CLI
✅
TypeScript
✅
Go
✅
C#
✅
Ruby
✅
MCP Typescript
✅
Postman
✅
Python
✅
Java
✅
PHP
✅
Terraform
✅
Unity
✅
CLI
✅
TypeScript
✅
Go
✅
C#
✅
Ruby
✅
MCP Typescript
✅
Postman
⛔
Python
✅
Java
✅
PHP
✅
Terraform
⛔
Unity
⛔
CLI
✅
TypeScript
✅
Go
✅
C#
✅
Ruby
✅
MCP Typescript
✅
Postman
⛔
Python
✅
Java
✅
PHP
✅
Terraform
⛔
Unity
⛔
CLI
⛔
Security & Authentication
Feature
TypeScript
✅
Go
✅
C#
✅
Ruby
✅
MCP Typescript
✅
Postman
✅
Python
✅
Java
✅
PHP
✅
Terraform
✅
Unity
✅
CLI
✅
TypeScript
✅
Go
✅
C#
✅
Ruby
✅
MCP Typescript
✅
Postman
⛔
Python
✅
Java
✅
PHP
✅
Terraform
⛔
Unity
⛔
CLI
⛔
TypeScript
✅
Go
✅
C#
✅
Ruby
✅
MCP Typescript
✅
Postman
⛔
Python
✅
Java
✅
PHP
✅
Terraform
✅
Unity
✅
CLI
✅
TypeScript
✅
Go
✅
C#
✅
Ruby
✅
MCP Typescript
✅
Postman
✅
Python
✅
Java
✅
PHP
✅
Terraform
✅
Unity
⛔
CLI
✅
TypeScript
✅
Go
✅
C#
✅
Ruby
✅
MCP Typescript
✅
Postman
⛔
Python
✅
Java
✅
PHP
✅
Terraform
⛔
Unity
⛔
CLI
✅
TypeScript
✅
Go
✅
C#
✅
Ruby
✅
MCP Typescript
✅
Postman
⛔
Python
✅
Java
✅
PHP
✅
Terraform
✅
Unity
⛔
CLI
✅
SDK Behavior
Feature
TypeScript
✅
Go
✅
C#
✅
Ruby
✅
MCP Typescript
✅
Postman
⛔
Python
✅
Java
✅
PHP
✅
Terraform
⛔
Unity
✅
CLI
✅
TypeScript
✅
Go
✅
C#
✅
Ruby
✅
MCP Typescript
✅
Postman
⛔
Python
✅
Java
✅
PHP
✅
Terraform
⛔
Unity
⛔
CLI
⛔
TypeScript
⛔
Go
⛔
C#
⛔
Ruby
⛔
MCP Typescript
⛔
Postman
⛔
Python
✅
Java
⛔
PHP
⛔
Terraform
⛔
Unity
⛔
CLI
⛔
TypeScript
✅
Go
✅
C#
✅
Ruby
✅
MCP Typescript
✅
Postman
⛔
Python
✅
Java
✅
PHP
✅
Terraform
⛔
Unity
⛔
CLI
⛔
Add Webhooks
Feature
TypeScript
✅
Go
✅
C#
✅
Ruby
✅
MCP Typescript
✅
Postman
⛔
Python
✅
Java
✅
PHP
✅
Terraform
✅
Unity
✅
CLI
✅
TypeScript
✅
Go
✅
C#
✅
Ruby
✅
MCP Typescript
✅
Postman
⛔
Python
✅
Java
✅
PHP
✅
Terraform
⛔
Unity
⛔
CLI
⛔
Add Custom Code
Feature
TypeScript
✅
Go
✅
C#
✅
Ruby
✅
MCP Typescript
✅
Postman
⛔
Python
✅
Java
✅
PHP
✅
Terraform
✅
Unity
⛔
CLI
✅
TypeScript
✅
Go
✅
C#
✅
Ruby
✅
MCP Typescript
✅
Postman
✅
Python
✅
Java
✅
PHP
✅
Terraform
✅
Unity
✅
CLI
⛔
TypeScript
✅
Go
✅
C#
✅
Ruby
✅
MCP Typescript
✅
Postman
⛔
Python
✅
Java
✅
PHP
✅
Terraform
⛔
Unity
⛔
CLI
✅
TypeScript
✅
Go
✅
C#
✅
Ruby
✅
MCP Typescript
✅
Postman
⛔
Python
✅
Java
✅
PHP
✅
Terraform
⛔
Unity
⛔
CLI
✅
Environment
Feature
TypeScript
✅
Go
✅
C#
✅
Ruby
✅
MCP Typescript
✅
Postman
✅
Python
✅
Java
✅
PHP
✅
Terraform
✅
Unity
⛔
CLI
⛔
TypeScript
⛔
Go
⛔
C#
⛔
Ruby
⛔
MCP Typescript
⛔
Postman
⛔
Python
✅
Java
⛔
PHP
⛔
Terraform
⛔
Unity
⛔
CLI
⛔
TypeScript
✅
Go
✅
C#
✅
Ruby
✅
MCP Typescript
✅
Postman
⛔
Python
✅
Java
✅
PHP
✅
Terraform
⛔
Unity
⛔
CLI
⛔
TypeScript
✅
Go
✅
C#
✅
Ruby
✅
MCP Typescript
✅
Postman
⛔
Python
✅
Java
✅
PHP
✅
Terraform
⛔
Unity
⛔
CLI
⛔
Documentation & Dev Experience
Feature
TypeScript
✅
Go
✅
C#
✅
Ruby
✅
MCP Typescript
✅
Postman
✅
Python
✅
Java
✅
PHP
✅
Terraform
✅
Unity
✅
CLI
✅
TypeScript
✅
Go
✅
C#
✅
Ruby
✅
MCP Typescript
✅
Postman
✅
Python
✅
Java
✅
PHP
✅
Terraform
✅
Unity
✅
CLI
✅
TypeScript
✅
Go
✅
C#
✅
Ruby
✅
MCP Typescript
✅
Postman
⛔
Python
✅
Java
✅
PHP
✅
Terraform
⛔
Unity
⛔
CLI
✅
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