Curated 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
- curated for this set
- Free to start
- 18 of 20
- a free or freemium entry tier
- Public API
- 16 of 17
- 3 not determined
- Publish a price
- 20 of 20
- an anchor price on their own page
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.
How these 20 agents were picked
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, gate-passed `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 on this shelf

Agno
An Apache 2.0 Python agent SDK and AgentOS runtime, with a Control Plane you run in your own cloud.
Agent frameworksFreemiumClaudeFree tierGPTVerified 4 days agoBest 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 AI pair programming in your terminal, free under Apache 2.0, built to run against 14 LLM providers
Coding agentsFreeClaudeFree tierGPTVerified 7 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
An open-source (MIT) AI agent platform for customer support, with bi-directional MCP support, webchat, WhatsApp and voice channels. Self-host free or use the managed cloud from $0/month.
Agent platformsFreemiumAutonomousClaudeEnterpriseVerified 4 days agoBest 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
The open-source coding agent. Bring your own key. Runs in your editor, terminal, and as an SDK, with optional ClinePass for flat-rate open-model access.
Coding agentsFreemiumAutonomousClaudeEnterpriseVerified 4 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, visual platform for building production LLM apps and agents, self-host it or run it in the cloud.
Agent platformsFreemiumClaudeEnterpriseFree tierVerified 4 days agoBest 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
Google's open-source, code-first agent SDK with five language runtimes (Python, TypeScript, Go, Java, Kotlin), native A2A and MCP support, and an optional managed runtime on Google Cloud.
Agent frameworksFreemiumClaudeFree tierGPTVerified 4 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
The most widely-used framework for building LLM apps and agents, with LangGraph for stateful multi-agent control: open-source and free to self-host.
Agent frameworksFreemiumFree tierGPTMulti-agentVerified 4 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, MIT-licensed framework for building stateful, multi-agent AI workflows on cyclical graphs.
Agent frameworksPaidClaudeEnterpriseFree tierVerified 4 days agoBest 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
Letta is the open-source framework behind Letta Code, a stateful coding agent whose memory, skills, and identity persist across sessions rather than rebuilding context on every call.
Agent frameworksFreemiumEnterpriseFree tierOpen sourceVerified 4 days agoBest 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 data framework for LLM apps, with LlamaParse as the paid agentic OCR for messy documents and LlamaAgents for document workflows.
Agent frameworksFreemiumClaudeEnterpriseFree tierVerified 4 days agoBest 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
Microsoft's unified, MIT-licensed agent SDK for .NET and Python: the supported successor to AutoGen and Semantic Kernel.
Agent frameworksFreemiumClaudeFree tierGPTVerified 3 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).

Microsoft AutoGen
Microsoft's open-source framework for orchestrating conversations between multiple AI agents. Now in maintenance mode.
Agent frameworksFreeFree tierGPTMulti-agentVerified 4 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 visual builder for AI agents, with 200+ models, 1,000+ integrations, and one-click deployment as APIs, webhooks, or MCP servers.
Agent platformsFreemiumClaudeEnterpriseFree tierVerified 8 days agoNo-code visual builder for AI agents, with 200+ models from Anthropic, OpenAI, Google, Mistral, Meta and open-weight providers.

n8n
Source-available workflow automation with native AI-agent nodes and 500+ integrations. Self-hostable free, or on n8n Cloud from €20/month.
Agent platformsFreemiumClaudeEnterpriseFree tierVerified 4 days agoBest 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
OpenAI's lightweight open-source framework for building agents in Python and TypeScript, with handoffs, guardrails, tracing and a sandboxed workspace mode for long-running work.
Agent frameworksFreeFree tierGPTMulti-agentVerified 4 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
A free, open-source (MIT) AI coding agent for the terminal, desktop and IDE, with 75+ model providers, built-in subscription login, and a tested model marketplace behind it.
Coding agentsFreemiumClaudeFree tierGPTVerified 4 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 platform for cloud coding agents. Free local OSS, free Individual Cloud tier, self-hosted Enterprise with SSO and RBAC.
Coding agentsFreemiumAutonomousClaudeEnterpriseVerified 4 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
The Python AI SDK for type-safe agents, realtime voice, image generation and embeddings, with every model a string swap away.
Agent frameworksFreeClaudeFree tierGPTVerified 4 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
The developer platform for voice AI agents, bring your own model, voice and telephony, and Vapi orchestrates the call.
Voice agentsPaidAutonomousClaudeEnterpriseVerified 4 days agoBest 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
The open-source, GPU-native code editor built from scratch by Atom's creators — runs Claude Code, Codex and other agents via the Agent Client Protocol it created.
Coding agentsFreemiumClaudeEnterpriseFree tierVerified 4 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 wider than this shelf
A collection is one cut through the index. These are the full categories the agents above sit in, unfiltered.
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