Pydantic AI Harness is ready for Claude Fable 5.1
Published
Signal category
Products & Services
Quote
“Pydantic AI Harness is ready for Claude Fable 5.1!”
— Pydantic team
Company
Pydantic
The Pydantic Stack: Build with AI at scale, without fail with Pydantic Logfire, Pydantic AI, Pydantic Evals & AI Gateway
- Industry
- Software Development
- Location
- California, US
- Company size
- 40 employees
End-to-end AI engineering stack We started as a Python validation library. We're now the AI engineering company behind the stack that teams use to build with GenAI in production. Pydantic AI. Pydantic Logfire. Pydantic Evals. AI Gateway. Each tool is useful on its own. Together, they cover the full lifecycle of building with AI: from structured outputs and agent logic, to observability, evaluation, and cost tracking. Trusted by developers building at scale. Developer experience first, always. Pydantic, because AI is still just engineering.
Founded 2022