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▲292Every 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
- 11
Contribute to vrn21/bouvet.com development by creating an account on GitHub.
Jan 2026 · github.com · its alternatives →
- 12
DeepSeek Harness▲169Composable agent harness where everything is a plugin
Aug 2026 · github.com · its alternatives →
- 13
New tools for building agents and tools
2025 · openai.com · its alternatives →
- 14
OneCLI▲143Give every employee a secured, sandboxed pro assistant agent
Aug 2026 · onecli.sh · its alternatives →
- 15
Factory▲168Agent-native development on Web, IDE, CLI, Slack and mobile
2025 · factory.ai · its alternatives →
- 16
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 →
- 17
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 →
- 18
- 19
13,000+ MCP servers, skills & plugins for AI coding agents
Jul 2026 · codexmarketplaces.com · its alternatives →
- 20
Agent Sandboxfree tier, from $0.00025/mo▲97Your agent's personal remote computer and drive
Feb 2026 · agentsandbox.co · its alternatives →
- 21
OpenMolt▲132Hi HN! I built OpenMolt, an open-source framework for creating programmatic AI agents in Node.js. Instead of wiring complex workflows (that can break), you define agents in code with instructions, tools, integrations, and memory. The agent then plans steps and executes actions like calling APIs, updating data, or interacting with services. When things break or change, the agent can adapt instead of failing like static workflows. The goal is to make agents behave more like real software systems than prompt scripts. It includes: - a planning/execution loop - tool and API integrations -…
Mar 2026 · openmolt.dev · its alternatives →
- 22
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 →
- 23
A clean, modular SDK for building AI agents with OpenHands V1. - OpenHands/software-agent-sdk
Dec 2025 · openhands.dev · its alternatives →
- 24
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 →
Also compare
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 →