Comparisons
- The vendor's simulator vs an independent bench: what Sierra Simulations, Google Agent Platform evaluations, Decagon Simulations and Agentforce Testing Center do well, the five things a vendor's own simulator cannot do by construction, and how a bake-off runs with every candidate on the same exam.
- Veris with LangSmith, Braintrust, Arize, Langfuse and promptfoo: what each tool is for, what none of them provides, a side-by-side table, and how they fit together in one loop.
- How to test an AI agent before production: the five checks, the tools for each, and what a controlled sandbox with stateful twins, simulated users and injected faults adds.
The second question on almost every call, how to benchmark several vendors on one exam before buying, is answered on the FAQ page and in detail on the vendor simulators page above.