OpenAI
GPT-4o and GPT-4 Turbo frontier models
The top alternatives to Luel in the Foundation Models space, compared on features, pricing, and what they're best at.
Updated March 27, 2026
Luel is a rights-cleared multimodal data marketplace and collection engine for training AI models. Part of YC W2026, it was founded by William Namgyal (CEO, 2x founding engineer, Berkeley dropout) and Inigo Lenderking (COO, ML researcher, Berkeley CS dropout), with backing from investors at xAI, Meta, DoorDash, and Apple.
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.