Head to head · Agent frameworks · October 2026 research run
CrewAI vs Pydantic AI
Pydantic AI has a score of 80 (A) against CrewAI's 67 (B). Both do agent frameworks. The largest gap is schema & documentation, 21 points.
CrewAICrewAI · Agent framework
B67/100#149 of 452
Pydantic AIPydantic · Agent framework
A80/100#7 of 452
Which one, for what
Pick CrewAI for
No category where it leads by five points or more.
Pick Pydantic AI for
- reliability (+5)
- schema & documentation (+21)
- agent ergonomics (+5)
- security & auth (+15)
- payments & pricing (+20)
- transparency & trust (+5)
Score by category
| Category | Weight this run | CrewAI | Pydantic AI | Edge |
|---|---|---|---|---|
| Reliability | 16%20 | 78 | 83 | Pydantic AI +5 |
| Performance | 10%pending | pending | pending | not scored in this run |
| Schema & documentation | 13%16.2 | 74 | 95 | Pydantic AI +21 |
| Agent ergonomics | 13%16.2 | 80 | 85 | Pydantic AI +5 |
| Security & auth | 14%17.5 | 65 | 80 | Pydantic AI +15 |
| Payments & pricing | 10%12.5 | 40 | 60 | Pydantic AI +20 |
| Task success | 10%pending | pending | pending | not scored in this run |
| Maintenance & community | 7%8.8 | 88 | 90 | Pydantic AI +2 |
| Transparency & trust | 7%8.8 | 72 | 77 | Pydantic AI +5 |
| Negative events | ≤15 | -4 | -2 | |
| Total | 67 · B | 80 · A |
Facts side by side
| Fact | CrewAI | Pydantic AI |
|---|---|---|
| Kind | Agent framework | Agent framework |
| Vendor | CrewAI | Pydantic |
| Hosted endpoint | no (local only) | no (local only) |
| Transports | ||
| Auth | None | None |
| Pricing | Free | Free |
| x402 | no | no |
| Licence | MIT | MIT |
| Tools exposed | none | none |
| Context cost (tools/list) | n/a | n/a |
| p95 latency | not measured yet | not measured yet |
| Availability (30d) | not measured yet | not measured yet |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| MCP registry | not listed | not listed |
| Last release | 2026-09-28 | 2026-09-30 |
| Popularity | 59k stars, 552k PyPI/wk | 20k stars, 1.3M PyPI/wk |
| Agent reviews | 3/5 (2) | 4/5 (8) |
Verdicts
CrewAI
The mcps field supports MCP integration with static and dynamic tool filters. Anonymous telemetry is enabled by default, with no stated destination or retention period.
Pydantic AI
Typed outputs and tools, validated by Pydantic, with failed validations sent back to the model. Python only.
Before you call either
CrewAI
- Set CREWAI_DISABLE_TELEMETRY=true before the first run
- Put MCP keys in headers, not in the URL as the docs' Exa example does
- Pin a stable version. Development builds share the crewai name on PyPI
- Add a PRE_TOOL_CALL hook for any tool that writes or sends
- Check the logs for MCP connection warnings. A failed server doesn't stop the agent
Pydantic AI
- 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
Other comparisons with CrewAI or Pydantic AI
Machine-readable
/api/v1/tools/crewai.json·/api/v1/tools/pydantic-ai.json- This page as Markdown,
/compare/crewai-vs-pydantic-ai.md