AI · alternatives · 2026
24 alternatives to OpenAI Agents SDK
Build production agents with harness and sandbox
Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. Prices are shown for the 4 we have checked on their own sites, 4 of them free or with a free tier.
- 1
opencode▲393Your terminal's AI agent, with any model you want
2025 · opencode.ai · its alternatives →
- 2
HarnessRouter Community Editionfree tier, from $20/mo▲397Open-source unified interface for agent harnesses
Aug 2026 · harnessrouter.ai · its alternatives →
- 3
Open Agents▲161OpenAgents - The collaboration OS for AI agents. Contribute to openagents-org/openagents development by creating an account on GitHub.
Apr 2026 · open-agents.dev · its alternatives →
- 4
Harness by Autonomousfree tier, from $149/mo▲291Every coding agent, every machine, one command center.
7d ago · autonomous.ai · its alternatives →
- 5
CreateOS Sandbox▲153Instant, hardware Isolated Sandboxes for AI agents
Jul 2026 · createos.sh · its alternatives →
- 6
Build production-ready agents, fast.
2025 · github.com · its alternatives →
- 7
Build no-code agents to target markets untouched by AI
2024 · its alternatives →
- 8
Buda▲197Run a full AI agent team in the cloud — no hardware, no setup. Persistent memory, browser automation, parallel agents. The OpenClaw alternative built for teams. Start free.
May 2026 · buda.im · its alternatives →
- 9
We’ve been working with automating coding agents in sandboxes as of late. It’s bewildering how poorly standardized and difficult to use each agent varies between each other. We open-sourced the Sandbox Agent SDK based on tools we built internally to solve 3 problems: 1. Universal agent API: interact with any coding agent using the same API 2. Running agents inside the sandbox: Agent Sandbox provides a Rust binary that serves the universal agent API over HTTP, instead of having to futz with undocumented interfaces 3. Universal session schema: persisting sessions is always problematic, since…
Jan 2026 · github.com · its alternatives →
- 10
Contribute to vrn21/bouvet.com development by creating an account on GitHub.
Jan 2026 · github.com · its alternatives →
- 11
DeepSeek Harness▲169Composable agent harness where everything is a plugin
Aug 2026 · github.com · its alternatives →
- 12
New tools for building agents and tools
2025 · openai.com · its alternatives →
- 13
OneCLI▲143Give every employee a secured, sandboxed pro assistant agent
Aug 2026 · onecli.sh · its alternatives →
- 14
Factory▲168Agent-native development on Web, IDE, CLI, Slack and mobile
2025 · factory.ai · its alternatives →
- 15
A lightweight, single-binary coding agent harness written in Go. Anthropic, OpenAI, Kimi, DeepSeek, Google Gemini, Ollama, managed llama.cpp models, five built-in tools, three run modes, extensions in any language, and a built-in Telegram bridge.
May 2026 · zot.sh · its alternatives →
- 16
A collection of open-source TypeScript tools by @enmanuelmag. heimdall-mcp for MCP proxy telemetry. agent-harness-kit for multi-agent orchestration.
May 2026 · ahk.cardor.dev · its alternatives →
- 17
- 18
13,000+ MCP servers, skills & plugins for AI coding agents
Jul 2026 · codexmarketplaces.com · its alternatives →
- 19
Agent Sandboxfree tier, from $0.00025/mo▲97Your agent's personal remote computer and drive
Feb 2026 · agentsandbox.co · its alternatives →
- 20
Velane▲95n8n is built for humans dragging nodes on a canvas. That breaks down at B2B scale (embedding in a product, multi-tenant scalability, etc). n8n does have an MCP server so agents can create workflows too, but it outputs raw JSON. That's fine for n8n's engine, but painful for a coding agent (or a human reviewing its output) to read, write, diff, or debug. I'm building an alternative where workflows are authored by a coding agent in [a more dev-legible format] instead of JSON blobs, and execute it at scale.
Jul 2026 · velane.sh · its alternatives →
- 21
A clean, modular SDK for building AI agents with OpenHands V1. - OpenHands/software-agent-sdk
Dec 2025 · openhands.dev · its alternatives →
- 22
I'm working on a coding agent for building iOS apps. It's built on openspec and xcodebuildmcp. It's free and open source.
Apr 2026 · github.com · its alternatives →
- 23
Run Claude Agent SDK in sandboxed environments
Jan 2026 · github.com · its alternatives →
- 24
Hi HN! I’m Tony, co-founder of Inngest. I wanted to share AgentKit, our Typescript multi-agent library we’ve been cooking and testing with some early users in prod for months. Although OpenAI’s Agents SDK has been launched since, we think an Agent framework should offer more deterministic and flexible routing, work with multiple model providers, embrace MCP (for rich tooling), and support the unstoppable and growing community of TypeScript AI developers by enabling a smooth transition to production use cases. This is why we are building AgentKit, and we’re really excited about it for a few…
2025 · github.com · its alternatives →
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Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →