Collection
Model-Agnostic AI Agent Tools
AI agent tools whose own product documentation supports multiple model providers or a bring-your-own-key layer, so the underlying LLM can be swapped without rebuilding the agent.
On this page
A model-agnostic AI agent is one whose own listing names multiple model providers or an explicit bring-your-own-key (BYOK) layer, rather than baking in a single vendor's models.
At a glance
- agents
- 20
- Free to start
- 19 of 20
- free plan or freemium
- Public API
- 18 of 20
- 2 more only on a paid tier
- Public pricing
- 20 of 20
- price on their own site
What this collection covers
The set below is the buyers' shortlist when the question is "what runs everywhere": agents whose own product documentation names Claude, GPT, Gemini and at least one open-weight family, and where swapping the underlying model is a configuration change rather than a rewrite.
Per-entry notes name which providers each agent explicitly supports, so the gap between "model-agnostic in name" and "model-agnostic in the listing's own text" is visible at a glance.
What it takes to be on this list
A tool earns a place here only when its own Published, sourced listing sets `attributes.modelAgnostic` to Yes, meaning the tool's own documentation names multiple model providers (Anthropic, OpenAI, Google, Mistral, Meta, DeepSeek and so on) or exposes an explicit bring-your-own-key layer where any compatible API endpoint can be plugged in. A single named provider with a roadmap promise of more does not qualify. Neither does a vendor's general "we work with all models" marketing claim that does not surface in the listing's own fields. Membership is derived from each listing's already-researched, quality-gated `attributes` and `integrations` data, not from inference about a tool's flexibility. Where a tool's claim to multi-provider support lives only in a third-party blog post or a community report, that is not enough; the listing must surface it in a field the listings lane has already verified.
The 20 agents
Agno
Python SDK plus self-hosted AgentOS runtime and hosted control plane for building and operating agents.
Agent frameworksFree, then $150/monthAPIAutonomousClaudeChecked todayBest for 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.
One of 20+ providers reachable through its model-agnostic Python interface, alongside OpenAI, Ollama and others.
Aider
Open-source terminal AI pair programmer that edits files in your local git repo and commits the changes.
Coding agentsFreeClaudeFree tierGPTChecked 11 days agoBest for Developers who want free, model-agnostic AI pair programming in their terminal
Anthropic is a named provider in its bring-your-own-key setup, alongside OpenAI, DeepSeek and local models.
Botpress
AI agent platform with a visual studio, a code-first TypeScript ADK and a helpdesk, priced per conversation.
Agent platformsFree, then $189/monthAPIAutonomousClaudeChecked last monthBest for Engineering-led teams building a multi-channel AI support agent who want an open-source, self-hostable core with an optional managed cloud layer.
Anthropic Claude is one of the model-agnostic options, alongside OpenAI, Google Gemini and open-weight models.
Cline
Open-source coding agent for VS Code, JetBrains, the terminal and CI, running on whichever model you bring.
Coding agentsFree, then $9.99/monthAPIAutonomousClaudeChecked 29 days agoBest for Developers and teams who want a transparent, open-source, model-agnostic agent they fully control and pay for by usage, with optional flat-rate access to open-weight models.
Anthropic is a named provider in its bring-your-own-key setup, alongside OpenAI or a local Ollama model.
Dify
Open-source platform for building agentic workflows, AI agents and RAG knowledge pipelines.
Agent platformsFree, then $59/monthAPIAutonomousClaudeChecked last monthBest for Developers and teams who want an open-source, self-hostable platform to build RAG apps and agents with full data control.
One of hundreds of model-agnostic options it can connect, alongside OpenAI, Google and open/local models.
Google Agent Development Kit (ADK)
Open-source framework for building, evaluating and deploying AI agents in Python, TypeScript, Go, Java or Kotlin.
Agent frameworksFreeAPIAutonomousClaudeChecked 26 days agoBest for Teams that want Google's own official, actively-developed agent SDK, especially polyglot teams (Python/Go/Java/TypeScript/Kotlin) or anyone building multi-agent systems that need to interoperate across vendors via the A2A protocol.
Reachable via LiteLLM alongside 100+ other providers, on top of native first-party Gemini support.
LangChain
Open source agent frameworks plus LangSmith, a hosted platform to trace, evaluate, deploy and govern agents.
Agent frameworksFree, then $39/seat/monthAPIAutonomousClaudeChecked 23 days agoBest for Engineering teams building a bespoke, production-grade agent who want the largest integration ecosystem plus real stateful control.
The most widely-used multi-provider LLM framework, with integrations for Anthropic, OpenAI, Google, Mistral, Ollama and dozens more.
LangGraph
Open-source orchestration framework and runtime for stateful, long-running LLM agents, from LangChain.
Agent frameworksFree, then $39/monthAPIAutonomousClaudeChecked last monthBest for Engineering teams building production agents who need cyclical graphs, durable state and replayable runs
Anthropic is a named provider in the standard model interface its agent runtime exposes, alongside OpenAI, Google and others.
Letta
Stateful agent harness, cloud and SDK for agents with persistent, git-versioned memory.
Agent frameworksFree, then $20/monthAPIAutonomousClaudeChecked last monthBest for 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 tier runs stateful agents with bring-your-own-keys for OpenAI, Anthropic, Google and any OpenAI-compatible local endpoint.
LlamaIndex
Open-source agent framework plus a credit-metered document parsing, extraction and indexing platform.
Agent frameworksFree, then $50/monthAPIClaudeEnterpriseChecked last monthBest for Engineers building RAG-heavy or document-heavy agents who want an MIT-licensed OSS core with an optional managed parsing and extraction platform on top.
Multi-provider LLM framework with Anthropic, OpenAI, Google, Mistral, DeepSeek, Ollama and Bedrock integrations wired through its agent stack.
Microsoft Agent Framework
Open-source .NET, Python and Go SDK for building AI agents and graph-based multi-agent workflows.
Agent frameworksFreeAPIAutonomousClaudeChecked 22 days agoBest for .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.
A named provider alongside Azure OpenAI, OpenAI, Ollama and Gemini (via its Go SDK).
AutoGen
Open-source Microsoft framework for building single and multi-agent AI applications in Python.
Agent frameworksFreeAPIAutonomousClaudeChecked 22 days agoBest for Python or .NET developers and researchers exploring multi-agent orchestration who want a mature, free, self-hosted framework.
Free, MIT-licensed multi-agent framework where you pay only your chosen model provider: OpenAI, Azure OpenAI, Anthropic, Ollama and others.
MindStudio
No-code platform for building, running and deploying AI agents as drag-and-drop workflows.
Agent platformsFree, then $20/monthAPIAutonomousClaudeChecked 22 days agoNo-code visual builder for AI agents, with 200+ models from Anthropic, OpenAI, Google, Mistral, Meta and open-weight providers.
n8n
Workflow automation platform for building and running AI agents on a visual canvas, with code where needed.
Agent platformsFree, then €24/monthAPIAutonomousClaudeChecked last monthBest for Ops and automation teams who want to build agentic workflows visually while keeping data on self-hosted infrastructure.
A named model-agnostic option alongside OpenAI and Ollama that its AI nodes can call.
OpenAI Agents SDK (Python)
Open-source Python framework for building agents with tools, handoffs, guardrails and tracing.
Agent frameworksFreeAPIAutonomousFree tierChecked 21 days agoBest for 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 and MIT-licensed framework: you pay only for the model API calls your agents make, to OpenAI or any other provider.
OpenCode
Open source AI coding agent for the terminal, desktop app and IDE, with 75+ model providers.
Coding agentsFree, then $10/monthAPIAutonomousClaudeChecked 20 days agoBest for Developers who want a genuinely free, fully open-source coding agent that works with any model provider, including their own local Ollama models, without being locked into one vendor's terminal tool.
Reachable through its 75+-provider Models.dev integration, alongside GPT, Gemini and local Ollama models.
OpenHands
Open-source software engineering agent with GUI, CLI, SDK and an enterprise control plane.
Coding agentsFree, then $0.10/1m input tokensAPIAutonomousClaudeChecked 20 days agoBest for Open source-minded engineering teams and enterprises that want a self-hostable coding agent platform
One of the two providers its own text names by example (Claude or GPT) for a bring-your-own-key setup that's otherwise model-agnostic.
Pydantic AI
Open-source Python agent framework from the Pydantic team, with a typed agent loop and swappable models.
Agent frameworksFreeAPIAutonomousClaudeChecked 20 days agoBest for Python teams building type-safe agents who also want realtime voice, image generation and embeddings in one SDK, with optional durable execution via Temporal, DBOS, Prefect or Restate.
A named provider in its type-safe, model-agnostic interface, alongside OpenAI, Gemini, Mistral and Ollama.
Vapi
Developer platform for building, testing and deploying voice AI agents that make and receive phone calls.
Voice agentsFrom $0.05/minuteAPIAutonomousClaudeChecked last monthBest for Engineering teams that want maximum control to build custom voice agents on their own choice of model, voice and telephony.
A named provider (with OpenAI and Google) in its otherwise bring-your-own-model pipeline.
Zed
Rust-based code editor with a built-in agent panel, ACP external agents and Zed-hosted models.
Coding agentsFree, then $10/monthClaudeEnterpriseFree tierChecked 12 days agoBest for Developers who want a fast, open-source editor and the freedom to run Claude Code, Codex, Gemini CLI or other vendors' own agents natively via the Agent Client Protocol Zed created, instead of being locked into one editor's built-in agent.
First-class, named support alongside OpenAI, Google, Mistral, DeepSeek and more, and it natively runs Claude Code as an external agent via the ACP it created.
Browse the full categories
The digestFree
Which agents actually ship.
New agents and articles, by email, at most once a week.
One-click unsubscribe