LangChain

Summary

LangChain publishes open source agent frameworks (LangChain, LangGraph and the dcode terminal coding agent) and sells LangSmith, a hosted platform for tracing, evaluating, deploying and governing those agents. Fleet adds no-code agent building on the same platform.

Best for: Engineering teams building a bespoke, production-grade agent who want the largest integration ecosystem plus real stateful control.
Not for: Teams that want a tiny, zero-abstraction wrapper for a single prompt-and-response.

Captured 2026-09-23 · theagentsindex.com

From: Freethen $39/seat/month
Free tier: YesDeveloper plan: $0 per seat, maximum of 1 seat, up to 5k base traces per month then pay-as-you-go, 5 LCU of Fleet usage and 5 LCU plus 1 LSU of sandbox usage per month, limited to 10 sandboxes, community support, no Deployment and no Engine.

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What it does

Writes code: YesThe vendor ships dcode, a free open-source terminal coding agent that writes and runs code from a prompt; it is a separate package from the paid LangSmith platform.dcode is an open-source terminal coding agent built on the Deep Agents SDK. Bring your own model, customize the agent harness, and control how code…langchain.com/dcode
Debugs and fixes: PartlyLangSmith Engine diagnoses failures from production traces and opens a GitHub pull request with the fix, but a human still merges it, and Engine is absent from the free Developer plan.Engine reads your source code to locate the code path behind a failing trace, ground its proposed fixes in the actual implementation, and open pull…docs.langchain.com/langsmith/engine
Writes tests: PartlyEngine generates ground-truth dataset examples and assertions so a fix can be evaluated offline; those are agent evals, not unit tests, and the vendor's CI guide leaves unit tests to you.Tracks the issue over time, automatically adding new traces that match the same pattern, and generates ground truth dataset examples so you can…docs.langchain.com/langsmith/engine
Whole-codebase work: PartlyEngine reads a whole connected repository to ground fixes and dcode carries context across sessions, but no page claims a repository-wide migration or multi-file refactor as a supported job.Engine can propose code changes to any connected repository, including agents built with Deep Agents, LangChain, and LangGraph.docs.langchain.com/langsmith/engine
Ships it: YesLangSmith Deployment runs agents in production with one-click deploy from Studio and a control-plane API; the free Developer plan shows Deployment as N/A, so shipping starts at Plus.Go from testing graphs locally in Studio to deploying them on Langsmith Cloud in 1 Click, directly from Studio.docs.langchain.com/langsmith/studio
Done-for-you service: PartlyYou run the software yourself on every self-serve plan; only Enterprise buyers get LangChain engineers, architectural guidance and team training alongside the product.Access to deployed engineerslangchain.com/pricing

How much it does unattended

Runs autonomously: YesEngine scans traces and drafts fixes on a schedule with nobody watching, and deployed agents run as background or cron-scheduled jobs rather than only in a chat session.Engine is scheduled to run once every 6 hours.langchain.com/pricing
Multi-agent: YesLangGraph is built for coordinating several agents in one graph, including hierarchical supervisors, and dcode delegates work to task-specific subagents in parallel.Design diverse control flows — single, multi-agent, hierarchical — all using one framework.langchain.com/langgraph
Agent permissions: YesHuman-in-the-loop interrupts gate agent actions in the framework, dcode gates code execution behind approval modes, and Fleet agents can run as themselves or as the calling user.Add human-in-the-loop checks to steer and approve agent actions.langchain.com/langgraph

Which models it runs on

Claude: YesA first-party langchain-anthropic package covers Claude with tool calling, structured output and streaming, and the LLM Gateway routes Anthropic model IDs with one LangSmith key.You can find information about Anthropic's latest models, their costs, context windows, and supported input types in the Claude docs.docs.langchain.com/oss/python/integrati…
GPT: YesA first-party langchain-openai package covers GPT models and Azure OpenAI deployments, and the gateway accepts OpenAI Chat Completions and Responses requests for them.You can find information about OpenAI's latest models, their costs, context windows, and supported input types in the OpenAI Platform docs.docs.langchain.com/oss/python/integrati…
Open models: YesOpen-weight models run through local Ollama, vLLM, Hugging Face and Together integrations, and the gateway can front a self-hosted OpenAI-compatible endpoint you operate yourself.Ollama allows you to run open-source Large Language Models (LLMs), such as gpt-oss, locally.docs.langchain.com/oss/python/integrati…
Model choice: YesYou choose the provider everywhere except Fleet's Fast, Pro and Max tiers, where LangChain selects and maintains the underlying model for you; custom configurations can override even those.All features support custom workspace configurations, so you can use any provider or model—even for features that show a curated list by default.docs.langchain.com/langsmith/model-conf…

Where you use it

In your editor: PartlyLangSmith Studio is the vendor's own agent IDE for visualising and debugging graphs, but no plugin for VS Code, JetBrains or Cursor is documented; dcode is a terminal, not an editor.Studio is a specialized agent IDE that enables visualization, interaction, and debugging of agentic systems that implement the Agent Server API…docs.langchain.com/langsmith/studio
On the command line: YesSeveral terminal surfaces exist: the LangGraph CLI for local dev servers, a Sandbox CLI on every plan, a LangSmith CLI for issues, and the dcode terminal coding agent.You can list issues programmatically using the LangSmith CLI.docs.langchain.com/langsmith/engine
In your pipeline: YesThe vendor documents a GitHub Actions pipeline that runs tests and offline evals on a pull request, then promotes preview deployments to production through the control-plane API.This guide demonstrates how to implement a comprehensive CI/CD pipeline for AI agent applications deployed in LangSmith Deployment.docs.langchain.com/langsmith/cicd-pipel…
In a browser: YesEverything paid runs in a hosted console at smith.langchain.com (traces, evals, Engine issues, Fleet agents and billing), and Fleet agents also reach users in Slack, Teams and Gmail.In the LangSmith console, select Engine in the UI sidebar.docs.langchain.com/langsmith/engine

Whose machine it runs on

Self-hosted: PartlyThe open source frameworks run anywhere, but self-hosting or hybrid-hosting the LangSmith platform on Kubernetes is an Enterprise-plan option; Developer and Plus are cloud-only.Self-hosted and hybrid deployment optionslangchain.com/pricing
Open source: PartlyThe frameworks and the dcode coding agent are MIT-licensed and free, while the LangSmith platform that carries the price, seats and governance is proprietary and hosted.Yes - LangChain is an MIT-licensed open-source library and is free to use.langchain.com/langchain

What it costs to run

How it meters: YesBilling mixes a per-seat licence with pay-as-you-go consumption: traces beyond the included allowance, plus compute units for Engine, Fleet, deployments and sandboxes.LangChain Compute Unit (LCU): A LCU is a normalized unit of work done on the LangSmith Platform and is used for pricing purposes.langchain.com/pricing
Free tier: YesThe Developer plan is a standing $0 tier with one seat and a monthly trace allowance, not a countdown trial, and the open source packages cost nothing at all.Up to 5k base traces / mo, then pay-as-you-golangchain.com/pricing
API access: YesThe LangSmith REST API is open to every plan and Fleet agents can be triggered by API, but the Agent Server's assistants and state endpoints arrive with the Plus plan.30+ API endpoints including state and memorylangchain.com/pricing
MCP server: YesAgents can be exposed as MCP servers on every plan including the free one, and can themselves consume tools from remote MCP servers; LangSmith also publishes its own MCP server.Expose agent as MCP serverlangchain.com/pricing
Bring your own key: PartlyYou can bring your own provider keys through the gateway on every plan, or buy inference as Gateway Credits, but Engine refuses your keys and bills its model use as compute units.Engine uses LangChain-managed inference exclusively. Bring Your Own Key (BYOK) is not supported; you cannot supply your own provider API keys for…docs.langchain.com/langsmith/engine

Buying it for a team

A company can buy it: YesPlus is bought self-serve by an organisation with unlimited seats and shared workspaces; Enterprise adds annual invoicing, custom terms and an infosec review for procurement.Add unlimited seats $39 per seat/monthlangchain.com/pricing
Seat model: YesSeats are counted per person including pending invitations, the free plan is capped at one seat, and Plus has no seat floor or ceiling at $39 each per month.A seat is a distinct user inside your organization. We consider the total number of users (including invited users) to determine the number of seats…langchain.com/pricing
Pooled budget: YesFleet's compute allowance is one balance for the whole organisation that resets monthly, and Engine spend limits are set org-wide or per project rather than per seat.Developer & Plus plans include a free usage allowance, shared across your organization and resets monthlylangchain.com/pricing
Admin controls: YesAdmins cap model spend and request rates through the gateway on every plan and set monthly compute ceilings on Engine; fine-grained role and tag policies need Enterprise.Central governance: Apply spend limits, rate limits, and data policies.docs.langchain.com/langsmith/llm-gateway
Audit log: PartlyA tamper-resistant log of administrative actions with a UI, an API and 400-day retention exists, but the vendor states plainly it is Enterprise-only: Developer and Plus get nothing.No. Audit logs are an Enterprise feature.docs.langchain.com/langsmith/audit-logs
Single sign-on: PartlyGoogle and GitHub social login come with the cheap plans, but SAML single sign-on and SCIM provisioning are Enterprise-only; self-hosted installs can wire up almost any OIDC provider.Enterprise customers can configure SAML SSO and SCIM.docs.langchain.com/langsmith/authentica…

What happens to your code

Opt out of training: YesNo opt-out is needed because the vendor states it never trains models on customer traces, prompts or outputs; Engine's analysis still runs through LangChain-managed inference.No. LangSmith does not use your data to train models. Your traces, prompts, and outputs remain private to your organization.langchain.com/pricing
Data residency: YesCloud customers pick a US or EU region, hybrid keeps the data plane in your own VPC, and a self-hosted install keeps everything inside your infrastructure.Host LangSmith in LangSmith's managed cloud with US or EU data residency.docs.langchain.com/langsmith/enterprise
Getting out: PartlyTraces can be queried through the SDK on any plan, but scheduled bulk export to your own S3 bucket in Parquet is now Enterprise-only for new customers, with older accounts cut off in 2027.For customers who signed up after August 3, 2026, bulk export is only available on the LangSmith Enterprise plan.docs.langchain.com/langsmith/data-export
Certifications: YesThe platform claims SOC 2 Type II, GDPR and HIPAA with annual third-party audits and penetration testing, plus AES-256 at rest and TLS 1.2 or higher in transit.We maintain SOC 2 Type II, GDPR, and HIPAA compliance and undergo annual third-party audits and penetration testing.docs.langchain.com/langsmith/shared-res…

Checked 2026-09-18 · How we check

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CrewAI
Open-source multi-agent framework with a managed platform for deploying and governing agent workflows.
LangGraph
Open-source orchestration framework and runtime for stateful, long-running LLM agents, from LangChain.

Filed under

APIAutonomousClaudeFree tierGPTMulti-agentOpen modelsOpen sourceSelf-hosted

Sources and updates

Sources31

Repository2026-08-30

Licence: MIT
Stars: 145,277
Forks: 24,250
Last push: 2026-08-30

Coverage elsewhere2

Updates5

2026-09-18Capabilities · Free tier · Terms
2026-09-02Capabilities · Free tier · Price · Terms
2026-08-31Capabilities · Free tier · Price · Terms
2026-08-19Tagline
2026-08-17Tag:claude