OpenAI
GPT-4o and GPT-4 Turbo frontier models
The top alternatives to Cascade in the Foundation Models space, compared on features, pricing, and what they're best at.
Updated March 27, 2026
Cascade builds custom evaluation infrastructure that makes AI agents reliable by learning from their real production behavior. Part of YC W2026, it was founded by Adam AlSayyad (CEO) and Haluk Cem Demirhan (CTO), both researchers from the Berkeley AI Research (BAIR) Lab — the same lab behind Databricks and Perplexity.
One platform for routing, observability, tracing, and evals across every LLM provider.
Anthropic
Claude 4 and Claude 3.5 Sonnet models
Respan lets you trace LLM and agent calls across any model or framework, A/B test prompts on production traffic, and route requests across 500+ models through one gateway.