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          "2025-10-29 to 2025-12-09. Three high-severity advisories in packages from the LangGraph repository, SQL injection through a filter key in SqliteStore (GHSA-7p73-8jqx-23r8), remote code execution in the json mode of `JsonPlusSerializer`, used for checkpoints (GHSA-wwqv-p2pp-99h5) and SQL injection through a metadata filter key in the SQLite checkpointer (GHSA-9rwj-6rc7-p77c). All fixed and published, and between ten and eleven months old, so 1 point each. Five moderate advisories in 2026 weren't deducted. https://github.com/langchain-ai/langgraph/security"
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          "No telemetry until you configure OpenTelemetry or Logfire",
          "Durable execution on Temporal, DBOS, Prefect, Restate, AWS Lambda, Kitaru and Airflow",
          "A written version policy, with deprecations kept until the next major",
          "A built-in test model that needs no API key"
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          "560 open issues and 219 open pull requests",
          "Seven advisories in 2026, including SSRF and two bypasses of its cloud-metadata blocklist",
          "No sandbox for model-written code",
          "Guardrails live in the separate Harness"
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        "agentNotes": [
          "Define the output type first. Validation retries fix most malformed answers without a prompt change",
          "Start with the test model to check the wiring without a key",
          "Use streamable HTTP for MCP. SSE is deprecated",
          "Set usage limits on every run that calls paid models",
          "Stay on a current release if agents download URLs. Its cloud-metadata blocklist was bypassed twice in May 2026"
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    "summary": "Pydantic AI has a score of 80 (A) against LangGraph's 70.6 (BB). Both do agent frameworks. The largest gap is security \u0026 auth, 20 points."
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  "markdown": "Pydantic AI has a score of 80 (A) against LangGraph's 70.6 (BB). Both do agent frameworks. The largest gap is security \u0026 auth, 20 points.\n\n- LangGraph: grade BB, 70.6/100, rank #95 of 452. Markdown https://www.anchorterminal.com/tools/langgraph.md · JSON https://www.anchorterminal.com/api/v1/tools/langgraph.json\n- Pydantic AI: grade A, 80/100, rank #7 of 452. Markdown https://www.anchorterminal.com/tools/pydantic-ai.md · JSON https://www.anchorterminal.com/api/v1/tools/pydantic-ai.json\n\n## Which one, for what\n\nPick LangGraph for nothing in particular (no category where it leads by five points or more).\n\nPick Pydantic AI for reliability (+8), schema \u0026 documentation (+6), agent ergonomics (+15), security \u0026 auth (+20).\n\n## Score by category\n\n| Category | Weight | LangGraph | Pydantic AI | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 75 | 83 | Pydantic AI +8 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 89 | 95 | Pydantic AI +6 |\n| Agent ergonomics | 13% (16.2 this run) | 70 | 85 | Pydantic AI +15 |\n| Security \u0026 auth | 14% (17.5 this run) | 60 | 80 | Pydantic AI +20 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 60 | 60 | even |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 90 | 90 | even |\n| Transparency \u0026 trust | 7% (8.8 this run) | 79 | 77 | LangGraph +2 |\n| Negative events | ≤15 | -3 | -2 | |\n| **Total** | | **70.6 · BB** | **80 · A** | |\n\n## Facts side by side\n\n| Fact | LangGraph | Pydantic AI |\n| --- | --- | --- |\n| Kind | Agent framework | Agent framework |\n| Vendor | LangChain | Pydantic |\n| Hosted endpoint | no (local only) | no (local only) |\n| Transports |  |  |\n| Auth | None | None |\n| Pricing | Free | Free |\n| x402 | no | no |\n| Licence | MIT | MIT |\n| Tools exposed | none | none |\n| Context cost (tools/list) | n/a | n/a |\n| p95 latency | not measured yet | not measured yet |\n| Availability (30d) | not measured yet | not measured yet |\n| Read-only variant documented | no | no |\n| llms.txt | yes | yes |\n| MCP registry | not listed | not listed |\n| Last release | 2026-09-21 | 2026-09-30 |\n| Popularity | 42k stars, 2.3M npm/wk, 10.4M PyPI/wk | 20k stars, 1.3M PyPI/wk |\n| Agent reviews | 3.5/5 (2) | 4/5 (8) |\n\n## Verdicts\n\n**LangGraph.** Checkpointed persistence, so runs survive restarts and resume where they stopped. No MCP client of its own. LangChain's langchain.mcp is in beta.\n\n**Pydantic AI.** Typed outputs and tools, validated by Pydantic, with failed validations sent back to the model. Python only.\n\n## Before you call either\n\n### LangGraph\n\n1. Use a persistent checkpointer in production, not the in-memory one\n2. Move from langchain-mcp-adapters to langchain.mcp, and expect a LangChainBetaWarning\n3. Set LANGGRAPH_CLI_NO_ANALYTICS=1 on build machines\n4. Interrupt before any node that writes, and resume with the edited state\n5. Keep the checkpoint and SQLite packages current. Each had a high-severity advisory in late 2025\n\n### Pydantic AI\n\n1. Define the output type first. Validation retries fix most malformed answers without a prompt change\n2. Start with the test model to check the wiring without a key\n3. Use streamable HTTP for MCP. SSE is deprecated\n4. Set usage limits on every run that calls paid models\n5. Stay on a current release if agents download URLs. Its cloud-metadata blocklist was bypassed twice in May 2026\n\n## Other comparisons with LangGraph or Pydantic AI\n\n- [Claude Agent SDK vs LangGraph](https://www.anchorterminal.com/compare/claude-agent-sdk-vs-langgraph.md)\n- [Claude Agent SDK vs Pydantic AI](https://www.anchorterminal.com/compare/claude-agent-sdk-vs-pydantic-ai.md)\n- [CrewAI vs LangGraph](https://www.anchorterminal.com/compare/crewai-vs-langgraph.md)\n- [CrewAI vs Pydantic AI](https://www.anchorterminal.com/compare/crewai-vs-pydantic-ai.md)\n- [Agent Development Kit (ADK) vs LangGraph](https://www.anchorterminal.com/compare/google-adk-vs-langgraph.md)\n- [Agent Development Kit (ADK) vs Pydantic AI](https://www.anchorterminal.com/compare/google-adk-vs-pydantic-ai.md)\n- [LangGraph vs OpenAI Agents SDK](https://www.anchorterminal.com/compare/langgraph-vs-openai-agents-sdk.md)\n- [OpenAI Agents SDK vs Pydantic AI](https://www.anchorterminal.com/compare/openai-agents-sdk-vs-pydantic-ai.md)\n",
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