Which Agent Frameworks & SDKs product is most agent-friendly?

Claude Agent SDK ranks first in ProductArena's Agent Frameworks & SDKs arena, with a PA Score of 38/100 — see the full evidence-graded leaderboard at https://ultrametric.ai/productarena/arena/agent-frameworks.

How is this measured?

Every product is judged against a shared taxonomy of user stories using cited evidence (vendor docs, GitHub, community sources, or a hands-on probe) — never opinion. See https://ultrametric.ai/productarena/methodology for the full scoring writeup.

Arena

Agent Frameworks & SDKs arenaAgent Frameworks & SDKs

Frameworks and SDKs for building LLM agents — tool definitions, multi-agent orchestration, durable state, human-in-the-loop control, and the observability and deployment story around them — judged on how quickly a team ships a reliable agent and how little the framework locks them in.

51 user stories · 459 judged cells · updated 2026-09-16 · Evidence as of 2026-09-16

Buyer checklist →Procurement report →

Leaderboard — every product ranked by evidenceLeaderboard

Rank by

									Access	Verification
1	Claude Agent SDK usage-based vs OpenAI Agents SDK ↗	38/100 C	67/100	60/100	3/100	17/100	34/100	★ 8.1k▲ 6.4k/yrnpm 9M/wk	MCP✓CLI✓API✓	9/34 verified · 2 disputed	0/100 integrity
2	OpenAI Agents SDK usage-based vs Claude Agent SDK ↗	37/100 B	55/100	35/100	10/100	60/100	9/100	★ 29.4k▲ 19.5k/yrnpm 1.3M/wk	MCP✓CLI—API✓	9/28 verified	27/100 integrity
3	Pydantic AI free-tier vs Claude Agent SDK ↗	36/100 C	62/100	44/100	13/100	38/100	6/100	★ 19.9k▲ 8.9k/yr	MCP✓CLI✓API✓	17/35 verified · 3 disputed	0/100 integrity
4	Google ADK vs Claude Agent SDK ↗	35/100 A	46/100	19/100	4/100	63/100	31/100	★ 21.5k▲ 14.8k/yr	MCP✓CLI✓API~	2/34 verified · 1 disputed	0/100 integrity
5	smolagents vs Claude Agent SDK ↗	33/100 A	52/100	33/100	7/100	47/100	14/100	★ 29.3k▲ 16.5k/yr	MCP~CLI✓API✓	6/29 verified	22/100 integrity
6	CrewAI free-tier vs Claude Agent SDK ↗	33/100 B	47/100	49/100	5/100	36/100	23/100	★ 58.5k▲ 20.3k/yrpypi 585.4k/wk	MCP✓CLI✓API~	18/34 verified · 3 disputed	29/100 integrity
7	Mastra free-tier vs Claude Agent SDK ↗	32/100 A	51/100	52/100	3/100	12/100	37/100	★ 28k▲ 13.3k/yrnpm 1.2M/wk	MCP✓CLI~API~	10/36 verified · 2 disputed	10/100 integrity
8	LangGraph🔥 free-tier vs Claude Agent SDK ↗	27/100 A	43/100	21/100	3/100	42/100	13/100	★ 41.6k▲ 13.4k/yrnpm 2.5M/wkpypi 10M/wk	MCP✓CLI✓API~	17/29 verified	40/100 integrity
9	AutoGen vs Claude Agent SDK ↗	26/100 B	31/100	33/100	9/100	46/100	9/100	★ 61k▲ 19.8k/yr	MCP~CLI—API✓	10/28 verified	38/100 integrity

Best by user type — persona-weighted winnersBest by user type

Per persona, the product with the highest persona-weighted coverage over just that persona's stories — not the same ranking as the overall PA Score leaderboard above.

Best for developer

Mastra

64/100

Runner-up: OpenAI Agents SDK (60/100)

13 developer stories scored

Best for engineering-lead

Mastra

61/100

Runner-up: Google ADK (60/100)

6 engineering-lead stories scored

Best for ai-native

Pydantic AI

36/100

Runner-up: Claude Agent SDK (35/100)

32 ai-native stories scored

Story matrix — every product × every judged storyStory matrix

Filter by persona51/51 stories shown · legend

Agenticness — how well agents can access and operate the productAgenticness

Agent access

Story	Persona	LangGraph	OpenAI Agents SDK	Claude Agent SDK	CrewAI	Pydantic AI	Mastra	Google ADK	AutoGen	smolagents
Agenticness — how well agents can access and operate the productPoint an agent at llms.txt or agent-oriented docs	ai-native	fullT 9/10	fullT 8/10	fullT 9/10	fullT 9/10	fullT 8/10	fullT 9/10	disputedD 3/10	none 0/10	partialT 4/10
Agenticness — how well agents can access and operate the productRun the product headlessly / in CI for automation	ai-native	partialC 6/10	fullC 7/10	fullX 8/10	fullT 8/10	fullC 8/10	partialC 6/10	fullC 8/10	partialC 6/10	fullC 7/10
Agenticness — how well agents can access and operate the productPlug MCP servers into this product so it can use their tools	ai-native	fullC 6/10	fullC 9/10	fullC 8/10	fullC 8/10	fullC 8/10	fullC 8/10	fullC 8/10	partialC 6/10	partialC 6/10
Agenticness — how well agents can access and operate the productConnect an agent via an official MCP server	ai-native	none 0/10	n/a	n/a	none 0/10	n/a	fullT 8/10	partialC 6/10	n/a	n/a
Agenticness — how well agents can access and operate the productUse an official CLI	ai-native	fullT 9/10	none 0/10	fullT 7/10	fullT 8/10	fullT 8/10	partialC 6/10	fullC 8/10	none 0/10	fullC 8/10
Agenticness — how well agents can access and operate the productDrive the product through a documented public API	ai-native	partialT 7/10	fullT 8/10	fullX 9/10	partialT 6/10	fullT 8/10	partialT 6/10	partialT 6/10	fullT 7/10	fullT 7/10
Agenticness — how well agents can access and operate the productIssue scoped/least-privilege API credentials for an agent	ai-native	none 0/10	none 0/10	partialC 4/10	none 0/10	none 0/10	none 0/10	none 0/10	none 0/10	none 0/10
Agenticness — how well agents can access and operate the productBuild against official SDKs	ai-native	fullT 8/10	fullX 9/10	fullX 8/10	partialT 6/10	fullX 8/10	fullT 8/10	fullC 9/10	fullT 8/10	fullC 8/10
Agenticness — how well agents can access and operate the productSubscribe to events via webhooks	ai-native	none 0/10	none 0/10	none 0/10	partialC 5/10	none 0/10	none 0/10	none 0/10	none 0/10	n/a

Agentic features

Story	Persona	LangGraph	OpenAI Agents SDK	Claude Agent SDK	CrewAI	Pydantic AI	Mastra	Google ADK	AutoGen	smolagents
Agenticness — how well agents can access and operate the productGet AI-generated insights and suggestions from my data inside the product	ai-native	n/a	n/a	partialC 6/10	partialX 5/10	n/a	n/a	n/a	partialC 4/10	partialX 5/10
Agenticness — how well agents can access and operate the productSet up automations that run autonomously in the background	ai-native	partialX 7/10	none 0/10	partialX 6/10	fullX 7/10	partialX 5/10	fullC 8/10	partialC 6/10	partialX 6/10	none 0/10
Agenticness — how well agents can access and operate the productDelegate tasks to a built-in AI assistant inside the product	ai-native	n/a	partialC 6/10	fullC 8/10	fullC 8/10	partialT 6/10	n/a	none 0/10	partialC 6/10	n/a
Agenticness — how well agents can access and operate the productOperate the product with natural-language commands	ai-native	none 0/10	fullC 7/10	fullC 8/10	none 0/10	fullC 7/10	partialT 4/10	partialC 5/10	partialC 6/10	fullC 7/10

Api quality

Story	Persona	LangGraph	OpenAI Agents SDK	Claude Agent SDK	CrewAI	Pydantic AI	Mastra	Google ADK	AutoGen	smolagents
Agenticness — how well agents can access and operate the productExplore an interactive API reference with runnable examples	ai-native	none 0/10	none 0/10	none 0/10	none 0/10	none 0/10	none 0/10	none 0/10	none 0/10	none 0/10
Agenticness — how well agents can access and operate the productDownload a machine-readable API spec (OpenAPI or equivalent)	ai-native	none 0/10	none 0/10	none 0/10	none 0/10	partialT 5/10	none 0/10	none 0/10	none 0/10	n/a
Agenticness — how well agents can access and operate the productTest against a sandbox environment without touching production data	ai-native	partialC 4/10	fullC 7/10	partialC 3/10	none 0/10	partialX 5/10	partialC 4/10	partialC 5/10	partialX 4/10	partialC 6/10
Agenticness — how well agents can access and operate the productRely on versioned APIs with a documented deprecation policy	ai-native	none 0/10	none 0/10	none 0/10	partialT 3/10	none 0/10	none 0/10	none 0/10	partialC 3/10	none 0/10

Agents tools — stories about agents tools in this arenaAgents tools

Agent authoring

Story	Persona	LangGraph	OpenAI Agents SDK	Claude Agent SDK	CrewAI	Pydantic AI	Mastra	Google ADK	AutoGen	smolagents
Agents tools — stories about agents tools in this arenaDefine an agent with typed custom tools in a few lines of code	developer	partialX 4/10	fullX 9/10	fullC 7/10	partialC 6/10	fullX 9/10	fullC 9/10	partialC 6/10	partialC 6/10	fullX 8/10

Ai buildability

Story	Persona	LangGraph	OpenAI Agents SDK	Claude Agent SDK	CrewAI	Pydantic AI	Mastra	Google ADK	AutoGen	smolagents
Agents tools — stories about agents tools in this arenaHave a coding agent scaffold a new agent project from an official CLI or template in one command	ai-native	partialT 4/10	none 0/10	none 0/10	fullT 8/10	none 0/10	partialC 6/10	fullC 8/10	none 0/10	partialC 4/10
Agents tools — stories about agents tools in this arenaRun the framework's example agents headlessly from a terminal so an agent can verify what it just built	ai-native	partialT 4/10	partialC 5/10	partialX 5/10	partialT 5/10	partialC 5/10	none 0/10	fullC 7/10	partialX 4/10	partialC 6/10
Agents tools — stories about agents tools in this arenaRely on strict typing and schema validation so a coding agent catches its own mistakes at build time	ai-native	partialC 3/10	partialC 6/10	partialC 4/10	none 0/10	disputedD 5/10	fullC 6/10	none 0/10	none 0/10	none 0/10

Automation depth — how much of the product can run unattendedAutomation depth

Story	Persona	LangGraph	OpenAI Agents SDK	Claude Agent SDK	CrewAI	Pydantic AI	Mastra	Google ADK	AutoGen	smolagents
Automation depth — how much of the product can run unattendedPerform bulk operations across many items at once	ai-native	none 0/10	none 0/10	partialX 5/10	partialX 5/10	partialC 4/10	partialC 4/10	partialC 3/10	none 0/10	partialX 4/10
Automation depth — how much of the product can run unattendedDefine rules that trigger actions automatically on events	ai-native	partialC 4/10	partialC 4/10	fullC 7/10	partialX 6/10	none 0/10	partialC 6/10	fullC 7/10	partialC 4/10	n/a
Automation depth — how much of the product can run unattendedSchedule recurring jobs or workflows	ai-native	none 0/10	none 0/10	none 0/10	none 0/10	none 0/10	fullC 7/10	none 0/10	none 0/10	none 0/10
Automation depth — how much of the product can run unattendedVersion, review, and roll back my automations	ai-native	partialC 5/10	none 0/10	none 0/10	partialX 2/10	none 0/10	none 0/10	none 0/10	none 0/10	partialC 4/10

Deployment portability — stories about deployment portability in this arenaDeployment portability

Deployment

Story	Persona	LangGraph	OpenAI Agents SDK	Claude Agent SDK	CrewAI	Pydantic AI	Mastra	Google ADK	AutoGen	smolagents
Deployment portability — stories about deployment portability in this arenaDeploy an agent to a managed runtime and call it as an API endpoint	engineering-lead	partialX 6/10	none 0/10	partialC 6/10	partialC 6/10	none 0/10	partialT 6/10	fullC 8/10	partialC 4/10	none 0/10
Deployment portability — stories about deployment portability in this arenaRun my agents entirely on my own infrastructure with no dependence on the vendor's platform	engineering-lead	fullX 7/10	partialC 6/10	disputedD 4/10	fullX 7/10	fullC 7/10	fullX 8/10	fullC 8/10	fullX 8/10	fullC 8/10

Portability

Story	Persona	LangGraph	OpenAI Agents SDK	Claude Agent SDK	CrewAI	Pydantic AI	Mastra	Google ADK	AutoGen	smolagents
Deployment portability — stories about deployment portability in this arenaSwap the underlying LLM provider or model without rewriting my agent	developer	none 0/10	fullC 8/10	none 0/10	fullC 7/10	disputedD 6/10	fullC 8/10	fullC 8/10	partialX 6/10	fullC 9/10

Evals observability — stories about evals observability in this arenaEvals observability

Evals

Story	Persona	LangGraph	OpenAI Agents SDK	Claude Agent SDK	CrewAI	Pydantic AI	Mastra	Google ADK	AutoGen	smolagents
Evals observability — stories about evals observability in this arenaScore agent quality with built-in evals and run them as part of CI	engineering-lead	none 0/10	none 0/10	none 0/10	partialC 4/10	partialC 6/10	partialC 5/10	fullC 8/10	none 0/10	none 0/10

Testing

Story	Persona	LangGraph	OpenAI Agents SDK	Claude Agent SDK	CrewAI	Pydantic AI	Mastra	Google ADK	AutoGen	smolagents
Evals observability — stories about evals observability in this arenaUnit-test agents with mocked models and tools	developer	none 0/10	none 0/10	none 0/10	none 0/10	fullX 8/10	none 0/10	partialC 5/10	none 0/10	none 0/10

Tracing

Story	Persona	LangGraph	OpenAI Agents SDK	Claude Agent SDK	CrewAI	Pydantic AI	Mastra	Google ADK	AutoGen	smolagents
Evals observability — stories about evals observability in this arenaTrace every LLM call and tool invocation of an agent run in an observability UI	developer	fullX 8/10	fullC 9/10	disputedD 4/10	partialC 7/10	fullX 9/10	fullC 8/10	partialC 5/10	partialC 4/10	fullC 8/10

Guardrails safety — stories about guardrails safety in this arenaGuardrails safety

Guardrails

Story	Persona	LangGraph	OpenAI Agents SDK	Claude Agent SDK	CrewAI	Pydantic AI	Mastra	Google ADK	AutoGen	smolagents
Guardrails safety — stories about guardrails safety in this arenaAttach input/output guardrails that validate, transform, or block unsafe content	developer	none 0/10	fullC 8/10	partialC 6/10	none 0/10	partialC 3/10	fullC 7/10	partialC 5/10	none 0/10	partialC 5/10
Guardrails safety — stories about guardrails safety in this arenaRestrict what an agent may do with fine-grained tool permissions and sandboxed execution	engineering-lead	none 0/10	partialC 7/10	fullC 8/10	partialX 3/10	partialC 6/10	fullC 7/10	partialC 4/10	partialX 5/10	partialX 6/10

Human in the loop — stories about human in the loop in this arenaHuman in the loop

Approval flows

Story	Persona	LangGraph	OpenAI Agents SDK	Claude Agent SDK	CrewAI	Pydantic AI	Mastra	Google ADK	AutoGen	smolagents
Human in the loop — stories about human in the loop in this arenaPause an agent mid-run for human input or approval and resume with the human's decision	developer	fullC 9/10	fullC 8/10	fullC 8/10	partialX 5/10	fullC 8/10	fullC 8/10	fullC 8/10	partialC 6/10	partialC 4/10
Human in the loop — stories about human in the loop in this arenaRequire human approval before specific sensitive tool calls execute	engineering-lead	fullX 8/10	fullC 8/10	fullC 8/10	disputedD 4/10	fullC 8/10	fullC 8/10	fullC 8/10	partialC 5/10	none 0/10

Memory context — stories about memory context in this arenaMemory context

Memory

Story	Persona	LangGraph	OpenAI Agents SDK	Claude Agent SDK	CrewAI	Pydantic AI	Mastra	Google ADK	AutoGen	smolagents
Memory context — stories about memory context in this arenaTrim, summarize, or filter conversation history to keep an agent inside its context window	developer	none 0/10	none 0/10	partialC 4/10	none 0/10	partialC 3/10	none 0/10	fullC 7/10	none 0/10	partialC 4/10
Memory context — stories about memory context in this arenaGive agents long-term memory that persists across sessions and threads	developer	fullX 8/10	partialC 5/10	partialC 6/10	fullC 8/10	partialX 5/10	fullC 8/10	partialC 3/10	partialC 5/10	none 0/10

Openness — open source, data portability, and self-hosting storiesOpenness

Story	Persona	LangGraph	OpenAI Agents SDK	Claude Agent SDK	CrewAI	Pydantic AI	Mastra	Google ADK	AutoGen	smolagents
Openness — open source, data portability, and self-hosting storiesDo everything through the API that I can do in the UI	ai-native	partialT 4/10	n/a	partialX 7/10	partialT 4/10	n/a	partialT 4/10	partialT 5/10	partialC 6/10	n/a
Openness — open source, data portability, and self-hosting storiesExport all of my data in open formats and leave	ai-native	partialC 4/10	n/a	partialC 5/10	none 0/10	partialX 5/10	none 0/10	n/a	partialC 4/10	partialC 4/10
Openness — open source, data portability, and self-hosting storiesRead the product's source under an open license	ai-native	partialC 5/10	partialX 5/10	none 0/10	partialC 6/10	none 0/10	disputedD 4/10	fullC 7/10	partialC 6/10	partialC 5/10
Openness — open source, data portability, and self-hosting storiesSelf-host the core product	ai-native	fullC 8/10	fullC 8/10	none 0/10	fullC 8/10	fullX 7/10	disputedD 5/10	fullC 8/10	fullX 8/10	fullC 8/10

Orchestration multi agent — stories about orchestration multi agent in this arenaOrchestration multi agent

Multi agent

Story	Persona	LangGraph	OpenAI Agents SDK	Claude Agent SDK	CrewAI	Pydantic AI	Mastra	Google ADK	AutoGen	smolagents
Orchestration multi agent — stories about orchestration multi agent in this arenaOrchestrate multiple agents — handoffs, subagents, or crews — inside one workflow	developer	fullX 8/10	fullX 9/10	fullC 8/10	fullX 9/10	fullX 7/10	fullX 7/10	fullC 9/10	fullX 9/10	fullC 8/10

Workflow control

Story	Persona	LangGraph	OpenAI Agents SDK	Claude Agent SDK	CrewAI	Pydantic AI	Mastra	Google ADK	AutoGen	smolagents
Orchestration multi agent — stories about orchestration multi agent in this arenaCompose agents into an explicit graph or workflow with branching, loops, and parallel steps	developer	fullX 9/10	partialX 5/10	partialC 4/10	partialC 6/10	partialC 6/10	partialX 7/10	fullC 9/10	partialC 6/10	partialC 4/10

Privacy posture — data-handling and privacy storiesPrivacy posture

Story	Persona	LangGraph	OpenAI Agents SDK	Claude Agent SDK	CrewAI	Pydantic AI	Mastra	Google ADK	AutoGen	smolagents
Privacy posture — data-handling and privacy storiesChoose where my data is stored (region/residency)	ai-native	none 0/10	none 0/10	none 0/10	none 0/10	n/a	partialC 4/10	none 0/10	n/a	n/a
Privacy posture — data-handling and privacy storiesPrevent my data from being used to train AI models	ai-native	none 0/10	none 0/10	none 0/10	n/a	n/a	n/a	n/a	n/a	n/a
Privacy posture — data-handling and privacy storiesControl data retention and deletion	ai-native	none 0/10	none 0/10	none 0/10	none 0/10	n/a	none 0/10	none 0/10	none 0/10	n/a
Privacy posture — data-handling and privacy storiesOpt out of telemetry and usage tracking	ai-native	none 0/10	none 0/10	none 0/10	none 0/10	partialC 4/10	none 0/10	none 0/10	none 0/10	none 0/10

State durability — stories about state durability in this arenaState durability

Durable state

Story	Persona	LangGraph	OpenAI Agents SDK	Claude Agent SDK	CrewAI	Pydantic AI	Mastra	Google ADK	AutoGen	smolagents
State durability — stories about state durability in this arenaCheckpoint agent state so a run can resume exactly where it left off after a crash or restart	developer	fullC 9/10	partialX 5/10	fullC 7/10	disputedD 4/10	fullC 7/10	fullC 8/10	none 0/10	partialC 3/10	partialC 4/10
State durability — stories about state durability in this arenaRun long-lived agents durably across process restarts and deploys, natively or via durable-execution integrations	engineering-lead	fullC 8/10	partialX 4/10	partialC 7/10	disputedD 3/10	partialX 6/10	fullC 7/10	partialC 3/10	none 0/10	none 0/10

Streaming output — stories about streaming output in this arenaStreaming output

Streaming

Story	Persona	LangGraph	OpenAI Agents SDK	Claude Agent SDK	CrewAI	Pydantic AI	Mastra	Google ADK	AutoGen	smolagents
Streaming output — stories about streaming output in this arenaStream tokens and intermediate agent events (tool calls, steps) to my UI in real time	developer	partialX 7/10	fullC 9/10	fullC 8/10	partialC 4/10	partialX 6/10	fullC 8/10	partialC 4/10	none 0/10	partialC 4/10

Structured output

Story	Persona	LangGraph	OpenAI Agents SDK	Claude Agent SDK	CrewAI	Pydantic AI	Mastra	Google ADK	AutoGen	smolagents
Streaming output — stories about streaming output in this arenaGet schema-validated structured output from an agent, with automatic retries when validation fails	developer	none 0/10	partialC 5/10	partialC 6/10	none 0/10	disputedD 5/10	partialC 5/10	none 0/10	none 0/10	partialC 3/10

Verdict✓ fullclear evidence~ partialwith caveats! disputedevidence conflicts— noneno evidence foundn/aquestion doesn't apply to this kind of product

ProofT probedtested by usX communityusers back itC claimedvendor claim onlyD contradictedevidence disagrees⚿ auth-gatedprobe hit a live sign-in wall — verified reachable, untestable keylessly

quality 0–10 · PA Score /100 · A–D = evidence confidence · full guide

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🤝Agent Frameworks & SDKs arenaAgent Frameworks & SDKs

Leaderboard — every product ranked by evidenceLeaderboard

Best by user type — persona-weighted winnersBest by user type

Story matrix — every product × every judged storyStory matrix

🤖Agenticness — how well agents can access and operate the productAgenticness

🤖Agents tools — stories about agents tools in this arenaAgents tools

⚙️Automation depth — how much of the product can run unattendedAutomation depth

🚀Deployment portability — stories about deployment portability in this arenaDeployment portability

🧪Evals observability — stories about evals observability in this arenaEvals observability

🛡️Guardrails safety — stories about guardrails safety in this arenaGuardrails safety

🤖Human in the loop — stories about human in the loop in this arenaHuman in the loop

🧠Memory context — stories about memory context in this arenaMemory context

🔓Openness — open source, data portability, and self-hosting storiesOpenness

🤖Orchestration multi agent — stories about orchestration multi agent in this arenaOrchestration multi agent

🔒Privacy posture — data-handling and privacy storiesPrivacy posture

🗄️State durability — stories about state durability in this arenaState durability

🔁Streaming output — stories about streaming output in this arenaStreaming output