Claude Agent SDK alternatives
6 agents tools in the same lane as Claude Agent SDK, ranked by editorial score.
GB
GPT Builder
Agents · OpenAI GPT-4o / GPT-5 (plan-dependent)
6.9
OpenAI's no-code editor for spinning up custom ChatGPT agents with instructions, knowledge files, and tool calls.
Paid· Basic: $10 · Standard: $20 · Premium: $30custom-chatbotsinternal-assistants
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
CM
claude-mem
Agents · Model-agnostic — works with the models used by the connected agent (Claude, GPT, Gemini, etc.) via MCP
Persistent, cross-agent memory for Claude Code and other coding assistants
Freemium· Pro: $30/mo · Team Cloud: $333 per seat per monthPersistent memory for Claude Code sessionsCross-IDE context sharing via MCP
GA
GenAI Agents (NirDiamant)
Agents · Framework-agnostic; most notebooks default to OpenAI GPT-4 class models, with Ollama and local model examples included.
50+ Jupyter tutorials for building GenAI agents, from a simple chatbot to multi-agent systems.
Free· Free and open source (Jupyter notebooks). Author sells an optional paid course at diamant-ai.com and runs a free newsletter; the repository itself has no paywall.LangGraph multi-agent workflowCustomer support agent
GE
gpt-engineer
Agents · OpenAI GPT (default), Anthropic Claude, Azure OpenAI, and open-weights models like WizardCoder via configuration
Describe software in natural language, watch an AI agent write, run, and improve it.
Free· Free and open source under MIT license. Users pay only for the underlying LLM API calls (OpenAI, Anthropic, Azure OpenAI) or run local models at zero token cost.Greenfield script and prototype generationSmall single-file utility creation from a spec
GP
GPT Pilot
Agents · Model-agnostic via OpenAI-compatible API (OpenAI GPT-4/4o, Anthropic Claude, Groq-hosted Llama, Azure OpenAI, OpenRouter)
Open-source multi-agent 'AI developer' that builds apps step by step with human checkpoints
Free· Free / open source (MIT). Users supply their own LLM API keys (OpenAI, Anthropic, Groq, Azure, or OpenRouter), so real cost depends on token usage on the chosen provider.greenfield full-stack app scaffoldingmulti-agent coding research