The AI agent stack

14 layers · 4 models per layer · updated 2026-07-15

Everything you pick when you take an agent from demo to production — framework, tools, auth, memory, execution, and the eval/observability loop. Each layer below is its own weekly re-polled 4-model ranking; this page assembles the current #1 picks in one place.

The stack, in one line

As of 2026-07-15, ChatGPT, Claude, Gemini and Grok collectively pick LangGraph (agent framework), Composio (tool integration), Arcade (agent auth & identity), Mem0 (memory), Firecrawl (web search & scraping), Browserbase (browser automation), Browser Use (computer use), E2B (code sandbox), Vapi (voice), Coinbase Agentic Wallets (payments), Braintrust (evals), LangSmith (simulation & testing), Langfuse (observability), NVIDIA NeMo Guardrails (security & guardrails) as the layers of a production AI agent on modelsagree.com.

Build

🤖 Agent framework

Orchestration: state, control flow, and multi-agent wiring

LangGraph langchain.com ↗All 4 models rank LangGraph the top pick

Then OpenAI Agents SDK, Pydantic AI.Full ranking →

🔌 Tool integration

Managed auth + ready-made tool APIs the agent can call

Composio composio.dev ↗3 of 4 models rank Composio the top pick

Then Arcade, Nango.Grok picks Arcade.Full ranking →

🔑 Agent auth & identity

Who the agent acts as — delegated user identity and scoped credentials

Arcade arcade.dev ↗2 of 4 models rank Arcade the top pick

Then Auth0, Composio.ChatGPT picks Descope; Claude picks Auth0.Full ranking →

🧠 Memory

What the agent remembers across sessions

Mem0 mem0.ai ↗All 4 models rank Mem0 the top pick

Then Zep, Letta.Full ranking →

Capabilities

🌐 Web search & scraping

Fresh web knowledge, returned in agent-consumable form

Firecrawl firecrawl.dev ↗2 of 4 models rank Firecrawl the top pick

Then Tavily, Exa.ChatGPT picks Tavily; Claude picks Tavily.Full ranking →

🌐 Browser automation

Headless browsers the agent can drive

Browserbase browserbase.com ↗3 of 4 models rank Browserbase the top pick

Then Browser Use, Playwright.Grok picks Playwright.Full ranking →

🖱 Computer use

Full GUI control — clicking real interfaces, not just APIs

Browser Use browser-use.com ↗1 of 4 models rank Browser Use the top pick

Then Browserbase, Anthropic Computer Use API.ChatGPT picks Browserbase; Claude picks Browserbase; Grok picks Anthropic Computer Use API.Full ranking →

📦 Code sandbox

Safe, isolated execution for agent-written code

E2B e2b.dev ↗All 4 models rank E2B the top pick

Then Modal, Daytona.Full ranking →

📞 Voice

Real-time speech in and out

Vapi vapi.ai ↗1 of 4 models rank Vapi the top pick

Then Retell AI, LiveKit Agents.ChatGPT picks LiveKit Agents; Gemini picks LiveKit; Grok picks Retell AI.Full ranking →

💳 Payments

Letting the agent spend money, safely

Coinbase Agentic Wallets coinbase.com ↗2 of 4 models rank Coinbase Agentic Wallets the top pick

Then Stripe Agentic Commerce, Crossmint.ChatGPT picks Stripe Agentic Commerce; Claude picks Stripe Agentic Commerce.Full ranking →

Operate & trust

📊 Evals

Scoring agent output quality, pre- and post-ship

Braintrust braintrust.dev ↗1 of 4 models rank Braintrust the top pick

Then LangSmith, DeepEval.ChatGPT picks LangSmith; Claude picks LangSmith; Gemini picks AgentOps.Full ranking →

🧪 Simulation & testing

Stress-testing agent behavior before production

LangSmith langchain.com ↗3 of 4 models rank LangSmith the top pick

Then Braintrust, Langfuse.Grok picks Langfuse.Full ranking →

📡 Observability

Tracing what the agent actually did, and why

Langfuse langfuse.com ↗1 of 4 models rank Langfuse the top pick

Then LangSmith, Braintrust.Claude picks LangSmith; Gemini picks LangSmith; Grok picks Braintrust.Full ranking →

🔐 Security & guardrails

Defenses against injection, leakage, and rogue actions

NVIDIA NeMo Guardrails nvidia.com ↗1 of 4 models rank NVIDIA NeMo Guardrails the top pick

Then Lakera Guard, Prisma AIRS.ChatGPT picks Check Point AI Security; Claude picks Lakera Guard; Gemini picks Lakera Guard.Full ranking →

Your stack ranked?

Using something else at one of these layers? Check how the four models grade any brand →

This stack moves

Every layer is re-polled weekly. Get one short email when a #1 flips.

Cite this stack

ModelsAgree, “The AI agent stack” — the #1 pick from ChatGPT, Claude, Gemini & Grok at each of 14 layers, polled 2026-07-15. https://modelsagree.com/stack/ai-agent (CC BY 4.0)

Tracked by ModelsAgree · each layer is a full 4-model leaderboard · re-polled weekly