Dev tools · alternatives · 2026
24 alternatives to OpenAI Responses API and Agents SDK
New tools for building agents and tools
Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes.
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Build production-ready agents, fast.
2025 · github.com · its alternatives →
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The open-source framework for real-time AI voice
2025 · videosdk.live · its alternatives →
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Build multi-agent systems with Google's open framework
2025 · adk.dev · its alternatives →
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Documentation.AI▲518Build and update product documentation effortlessly with AI
Dec 2025 · documentation.ai · its alternatives →
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Build production agents with harness and sandbox
Apr 2026 · openai.com · its alternatives →
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Build capable AI agents with memory & tools
2025 · mistral.ai · its alternatives →
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A clean, modular SDK for building AI agents with OpenHands V1. - OpenHands/software-agent-sdk
Dec 2025 · openhands.dev · its alternatives →
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UseAgents▲83Define tools once for agents use them everywhere
Mar 2026 · useagents.site · its alternatives →
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Hey HN, we’re building an open specification that lets agents discover and invoke APIs with natural language, built on the OpenAPI standard. agents.json clearly defines the contract between LLMs and API as a standard that's open, observable, and replicable. Here’s a walkthrough of how it works: https://youtu.be/kby2Wdt2Dtk?si=59xGCDy48Zzwr7ND. There’s 2 parts to this: 1. An agents.json file describes how to link API calls together into outcome-based tools for LLMs. This file sits alongside an OpenAPI file. 2. The agents.json SDK loads agents.json files as tools for an LLM that…
2025 · github.com · its alternatives →
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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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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 →
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Closing the gap between modern AI agents and Java ecosystem
Jan 2026 · bnbarak.github.io · its alternatives →
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Hey HN, I've been working on an open-source framework for creating AI agents that evolve, communicate, and collaborate to solve complex tasks. The Evolving Agents Framework allows agents to: Reuse, evolve, or create new agents dynamically based on semantic similarity Communicate and delegate tasks to other specialized agents Continuously improve by learning from past executions Define workflows in YAML, making it easy to orchestrate agent interactions Search for relevant tools and agents using OpenAI embeddings Support multiple AI frameworks (BeeAI, etc.) Current Status & Roadmap This is…
2025 · github.com · its alternatives →
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A collaborative AI workspace, built on your company context. Build and orchestrate agents right alongside your team
2020 · notion.so · its alternatives →
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Everything you need to ship great ai experiences
2025 · aisdktools.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 →