Semantic Kernel alternatives
6 agents tools in the same lane as Semantic Kernel, ranked by editorial score.
OA
OpenAI Agents SDK (Python)
Agents · GPT-4o / GPT-4.1 / gpt-realtime (provider-pluggable via LiteLLM)
A lightweight Python framework for building multi-agent LLM applications with handoffs, guardrails, and built-in tracing.
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.Multi-agent customer support with specialist handoffsVoice agents using gpt-realtime for phone or in-app calls
MA
Mastra
Agents · Multi-model (90+ providers)
8.1
Open-source TypeScript framework for building, deploying, and observing AI agents and workflows.
Freemium· Starter: $0 · Teams: $250 · Enterprise: Custom pricingai-agentsworkflow-orchestration
CA
Claude Agent SDK
Agents · Claude Opus / Sonnet
8.6
Anthropic's official SDK for building autonomous Claude agents.
Free· Free SDK; API usage billed at Claude ratesClaude agentstool use
BE
BentoML
Agents · Multi-model
8.2
Open-source framework and managed platform for serving and scaling AI models in production.
Freemium· OSS free (Apache 2.0); managed Bento cloud has free tier + usage-based pricingmodel-servingllm-inference
AU
AutoGPT
Agents · BYO (Claude / GPT / open)
7.5
Open-source platform for building autonomous AI agents.
Free· Free / open-source; hosted platform paidautonomous agentstask automation
GA
Guild AI
Agents · Multi-model (bring your own)
6.9
Control plane for deploying, governing, and auditing AI agents in production.
Freemium· Free: $0 · Individual: $20 · Team: $200 · Enterprise: Contact usagent deploymentagent governance