What Weights Evals AI does
W&B Weave is an observability and evaluation platform for production AI agents, from Weights & Biases. It provides agent-native tracing with sessions, turns, steps, tools, and sub-agents. Evaluations include a framework with comparisons and visualizations to catch regressions, plus a leaderboard view for comparing evaluations across an organization. The Playground tests prompts and models against production traces. Monitors classify agent interactions and send alerts. Guardrails include pre-built safety scorers for toxicity, bias, PII detection, and hallucinations, along with quality scorers for coherence, fluency, and context relevance. Coding agents such as Claude Code can connect through the W&B MCP server, and alerts can send Slack notifications. The page does not state pricing.
How Weights Evals AI compares with its closest alternatives
All 5 closest alternatives have a free plan, as Weights Evals AI does. Only Gumloop lists a starting price, $97 a month. All 5 offer an API, as Weights Evals AI does. Weights Evals AI offers a web app. Of the 4 alternatives with platforms on record, all 4 offer a web app. Weights Evals AI was founded in 2023; the alternatives were founded between 2022 and 2024, 3 of them earlier. Weights Evals AI is based in San Francisco, United States; 4 of its 5 alternatives are in the United States too, and the others in France.