Top 9 of 15 alternatives

9 Claude Agent SDK alternatives, all with a free plan (2026)

The closest alternatives to Claude Agent SDK in October 2026 are Letta, AutoGen and OpenAI Agents SDK (Python).

Updated 18 October 2026

9 agents compared · 9 with a free plan · prices checked 18 September–1 November 2026

Reviewed by The Agents Index editorial team.

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Claude Agent SDK and its alternatives at a glance

Agent	Best for	Starts at	Better than Claude Agent SDK at	Checked
Claude Agent SDK	Developers already building on Claude (or Claude Code) who want its exact agent loop, tools and context management as a callable library, and are comfortable being single-vendor on Anthropic in exchange for the tightest possible integration with Claude Code's own capabilities.	From $0.10 per 1m input tokens source		29 October 2026
Letta	Developers and researchers who specifically need an agent whose memory, skills and identity genuinely persist and evolve across long-running sessions, rather than reset on every call.	Free, then $20 a month source	GPT, Open models	2 September 2026
AutoGen	Python or .NET developers and researchers exploring multi-agent orchestration who want a mature, free, self-hosted framework.	Free source	GPT, Open models	19 September 2026
OpenAI Agents SDK (Python)	Developers who want the fastest, lightest way to ship a straightforward agent (support triage, a tool-using assistant or a sandboxed coding agent) with tracing and guardrails included.	Free source	GPT, Open models	18 October 2026
Microsoft Agent Framework	.NET or Python teams already invested in Azure or Microsoft Foundry who want one supported agent SDK, an optional managed hosting path, and a documented migration off AutoGen or Semantic Kernel.	Free source	GPT, Open models	19 September 2026
LangGraph	Engineering teams building production agents who need cyclical graphs, durable state and replayable runs	Free, then $39 a seat a month source	GPT, Open models	2 September 2026
CrewAI	Developers who want to stand up a role-based, collaborating multi-agent system quickly in Python, with a stable MIT-licensed core and a hosted build and runtime for production.	Free source	GPT, Open models	13 September 2026
LiveKit Agents	Engineering teams that want to own their voice-agent stack end to end, self-hosted or on LiveKit Cloud, without being locked into one vendor's API.	Free, then $50 a month source	GPT, Open models	2 September 2026
LangChain	Engineering teams building a bespoke, production-grade agent who want the largest integration ecosystem plus real stateful control.	Free, then $39 a seat a month source	Ships it, GPT	18 September 2026
Agno	Python developers who want an Apache 2.0 SDK with memory, knowledge, learning, guardrails and a Control Plane they run inside their own cloud account, and who are comfortable running Docker or a cloud deploy template themselves.	Free, then $150 a month source	GPT, Open models	17 October 2026

Closest alternatives to Claude Agent SDK

The ones people open most here come first, then the closest matches. How we check

Where Claude Agent SDK falls short: No supported path to run non-Anthropic models through the SDK's own agent loop. Teams that need real multi-provider flexibility need a different framework.

1
Letta
From Free
Stateful agent harness, cloud and SDK for agents with persistent, git-versioned memory.
Why it's on this list
GPT: YesOpenAI API keys and ChatGPT Plus/Pro Codex subscriptions both connect; toolsets switch per model family.
Source ↗
Better than Claude Agent SDK at
- Open models: Yes ↗
- In your editor: Yes ↗
Trade-offs
- Writes tests: Partly ↗
- MCP server: No ↗
Watch for
Smaller ecosystem and community than LangChain, LlamaIndex or Microsoft AutoGen.
2
AutoGen
From Free
Open-source Microsoft framework for building single and multi-agent AI applications in Python.
Why it's on this list
GPT: YesOpenAI is the primary documented model client, installed as an extra, and GPT models are used in nearly every example throughout the guides.
Source ↗
Better than Claude Agent SDK at
- Open models: Partly ↗
- In a browser: Yes ↗
Trade-offs
- Debugs and fixes: Partly ↗
- Reviews code: Partly ↗
Watch for
It is a code library, not a hosted service. You build, host and operate the agents yourself.
3
OpenAI Agents SDK (Python)
From Free
Open-source Python framework for building agents with tools, handoffs, guardrails and tracing.
Why it's on this list
GPT: YesOpenAI models are the default path, supported natively through both the Responses API and the Chat Completions API, with a GPT-5 family model used when an agent sets none.
Source ↗
Better than Claude Agent SDK at
- Open models: Partly ↗
- In a browser: Partly ↗
Trade-offs
- Writes code: Partly ↗
- Debugs and fixes: Partly ↗
Watch for
No automatic step-by-step checkpointing, `RunState` only snapshots at human-in-the-loop approval pauses, so you manage durable state yourself outside of that.

The rest of the shortlist

Microsoft Agent Framework
Open-source .NET, Python and Go SDK for building AI agents and graph-based multi-agent workflows.
Watch for: It is a code library plus an optional managed layer, not a no-code product. You (or Foundry Hosted Agents) run and operate it.
From Free
LangGraph
Open-source orchestration framework and runtime for stateful, long-running LLM agents, from LangChain.
Watch for: No native token-budget or cost-limit management in the framework. Cost caps have to be handled at the model-integration level.
From Free
CrewAI
Open-source multi-agent framework with a managed platform for deploying and governing agent workflows.
Watch for: Pricing jumps directly from a free 50-execution Basic tier to custom Enterprise, with no self-serve plan in between
From Free
LiveKit Agents
Open-source Python and Node.js framework for voice AI agents, with LiveKit Cloud hosting, telephony and observability.
Watch for: A framework, not a no-code or dashboard-first builder. Expect to write and deploy real code, unlike this category's more configured rivals.
From Free
LangChain
Open source agent frameworks plus LangSmith, a hosted platform to trace, evaluate, deploy and govern agents.
Watch for: Fast-moving: core abstractions have changed across major versions, so older tutorials can mislead.
From Free
Agno
Python SDK, self-hosted AgentOS runtime and hosted control plane for running agents as a service.
Watch for: The 3.2-microsecond / 5.2 KiB figure is measured on Agno's own published harness. Independent, reproducible benchmarks against LangGraph on neutral hardware were not found.
From Free