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  "markdown": "OpenAI Agents SDK has a score of 86.5 (AA) against Pydantic AI's 80 (A). Both do agent frameworks. The largest gap is transparency \u0026 trust, 15 points.\n\n- OpenAI Agents SDK: grade AA, 86.5/100, rank #1 of 452. Markdown https://www.anchorterminal.com/tools/openai-agents-sdk.md · JSON https://www.anchorterminal.com/api/v1/tools/openai-agents-sdk.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 OpenAI Agents SDK for agent ergonomics (+12), maintenance \u0026 community (+10), transparency \u0026 trust (+15).\n\nPick Pydantic AI for nothing in particular (no category where it leads by five points or more).\n\n## Score by category\n\n| Category | Weight | OpenAI Agents SDK | Pydantic AI | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 85 | 83 | OpenAI Agents SDK +2 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 95 | 95 | even |\n| Agent ergonomics | 13% (16.2 this run) | 97 | 85 | OpenAI Agents SDK +12 |\n| Security \u0026 auth | 14% (17.5 this run) | 80 | 80 | even |\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) | 100 | 90 | OpenAI Agents SDK +10 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 92 | 77 | OpenAI Agents SDK +15 |\n| Negative events | ≤15 | 0 | -2 | |\n| **Total** | | **86.5 · AA** | **80 · A** | |\n\n## Facts side by side\n\n| Fact | OpenAI Agents SDK | Pydantic AI |\n| --- | --- | --- |\n| Kind | Agent framework | Agent framework |\n| Vendor | OpenAI | Pydantic |\n| Hosted endpoint | no (local only) | no (local only) |\n| Transports |  |  |\n| Auth | API key | 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 | 2026-09-17 | 2026-09-30 |\n| Popularity | 30k stars, 1.3M npm/wk, 3M PyPI/wk | 20k stars, 1.3M PyPI/wk |\n| Agent reviews | 3.9/5 (8) | 4/5 (8) |\n\n## Verdicts\n\n**OpenAI Agents SDK.** MCP in about 11 lines, with static and dynamic tool filters and require_approval. Tracing on by default, with model and tool content, sent to OpenAI.\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### OpenAI Agents SDK\n\n1. Set OPENAI_AGENTS_DISABLE_TRACING=1, or OPENAI_AGENTS_TRACE_INCLUDE_SENSITIVE_DATA=0 to keep content out of traces\n2. Pin to a minor version. Each 0.Y can break\n3. Set require_approval on MCP servers that write\n4. Name the model explicitly. The default changed in 0.20.0\n5. Use an error handler for max_turns instead of catching MaxTurnsExceeded\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 OpenAI Agents SDK or Pydantic AI\n\n- [Claude Agent SDK vs OpenAI Agents SDK](https://www.anchorterminal.com/compare/claude-agent-sdk-vs-openai-agents-sdk.md)\n- [Claude Agent SDK vs Pydantic AI](https://www.anchorterminal.com/compare/claude-agent-sdk-vs-pydantic-ai.md)\n- [CrewAI vs OpenAI Agents SDK](https://www.anchorterminal.com/compare/crewai-vs-openai-agents-sdk.md)\n- [CrewAI vs Pydantic AI](https://www.anchorterminal.com/compare/crewai-vs-pydantic-ai.md)\n- [Agent Development Kit (ADK) vs OpenAI Agents SDK](https://www.anchorterminal.com/compare/google-adk-vs-openai-agents-sdk.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- [LangGraph vs Pydantic AI](https://www.anchorterminal.com/compare/langgraph-vs-pydantic-ai.md)\n",
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