Not Diamond
What ChatGPT, Claude, Gemini & Grok actually say · July 2026
The verdict
Not Diamond appears in 1 AI-ranked category — best position #2 for llm inference router.
Leading dynamic meta-router utilizing ML classifiers to evaluate prompts in real-time, directing requests to the optimal model based on cost, quality, and latency constraints while supporting custom evaluation datasets.
GPT Strongest dedicated routing-intelligence layer: pre-trained chat and coding routers, custom routers learned from your evaluation data, and per-request quality, cost, or latency optimization; it is the better choice than OpenRouter when routing accuracy should adapt to a specific workload.
Claude The strongest true per-prompt router — trains custom routers on your own evals to send each request to the best model while jointly optimizing quality, cost, and latency, delivering real savings versus always calling a frontier model; ranked here on capability in the literal "best model per request" sense rather than adoption.
Where Not Diamond falls short, per the models
- GPT It selects the model but is not a complete one-key inference gateway, so you must operate or integrate the execution, credentials, billing, and observability layer yourself.
- Claude Niche traction and a black-box router you must trust with eval data; it is not a full gateway (no key management, budgets, or observability), so most teams pair it with one of the options above.
- Gemini It introduces latency overhead from classifier runs and requires sending prompt data to a third-party hosted service, raising compliance concerns for sensitive data.
Top alternatives per the models: OpenRouter · LiteLLM · Portkey · RouteLLM
Rankings are computed from what the models answer, re-polled continuously · raw reasoning shown verbatim · methodology