Mastra vs OpenAI Agents SDK (Python)

Mastra

Agents

OpenAI Agents SDK (Python)

Agents

Tagline

Mastra

Open-source TypeScript framework for building AI-powered applications and agents.

OpenAI Agents SDK (Python)

A lightweight Python package for building agentic AI applications with minimal abstractions.

Pricing

Mastra

Freemium· Starter: $0 / month; Teams: $250 / month

OpenAI Agents SDK (Python)

Free· SDK is free and open source (MIT-licensed). Cost is pass-through to whichever model provider you point it at — OpenAI API pricing applies when using GPT models; third-party providers billed separately.

Lowest paid tier

Mastra

$250 / month · Teams

captured 2026-10-09

OpenAI Agents SDK (Python)

—

Free trial

Mastra

Yes

OpenAI Agents SDK (Python)

Not listed

API

Mastra

Yes

OpenAI Agents SDK (Python)

Yes

Platforms

Mastra

api

OpenAI Agents SDK (Python)

—

Open source

Mastra

Yes

OpenAI Agents SDK (Python)

Yes

Hacker News stories

Mastra

22

checked 2026-10-15

OpenAI Agents SDK (Python)

9

checked 2026-10-17

Earliest Wayback capture

Mastra

2024-11-05

earliest archived capture of the site, not a launch date

OpenAI Agents SDK (Python)

—

Model used

Mastra

Multi-model (90+ providers)

OpenAI Agents SDK (Python)

GPT-4o / GPT-4.1 / gpt-realtime (provider-pluggable via LiteLLM)

Editorial score

Mastra

8.1 / 10

OpenAI Agents SDK (Python)

—

Use cases

Mastra

Conversational agentsDomain-specific copilotsWorkflow automationsDecision-support toolsMCP server authoring

OpenAI Agents SDK (Python)

Building agents with instructions, tools, guardrails, and handoffsRunning specialist agents inside isolated workspacesBuilding voice agents with automatic interruption detectionCreating voice pipelines combining speech-to-text and text-to-speechMaintaining working context within an agent loop using sessions

Pros

Mastra

• Open-source TypeScript framework
• The vendor says that model routing across 90+ providers
• Built-in scorers and observability tools
• Support for authoring MCP servers
• Integration with React, Next.js, and Node

OpenAI Agents SDK (Python)

• The SDK offers a small set of primitives that makes it quick to learn while retaining enough features for practical use.
• Any Python function can be converted into a tool with automatic schema generation and Pydantic-powered validation.
• Guardrails run input validation and safety checks in parallel with agent execution to fail fast when checks do not pass.
• Built-in tracing supports visualizing, debugging, and monitoring workflows, with integration for OpenAI's evaluation, fine-tuning, and distillation tools.
• The SDK is Python-first, allowing developers to use built-in language features to orchestrate and chain agents without learning new abstractions.

Website

Mastra

mastra.ai

OpenAI Agents SDK (Python)

openai.github.io

Editorial score: rule-based, 0–10, from AI-assisted profile inputs (see /methodology) — not a user rating; “—” means unscored. “Not listed” means we have no record of it, not that it is absent. GitHub figures and prices carry the date they were checked or captured; prices are shown as published, unconverted.