{"slug":"not-diamond","name":"Not Diamond","domain":"notdiamond.ai","verdict":"As of 2026-08-10, ChatGPT, Claude, Gemini, Grok collectively rank Not Diamond first for llm routers for cost-aware model selection (one of 2 leaderboards it appears on). Source: https://modelsagree.com/product/not-diamond (modelsagree.com, CC BY 4.0).","best_rank":1,"categories":2,"entries":[{"slug":"best-llm-routers-for-cost-aware-model-selection","title":"Best LLM routers for cost-aware model selection","rank":1,"of":9,"score":16,"appearances":4,"modelRanks":{"ChatGPT":2,"Claude":3,"Gemini":1,"Grok":2},"reason":"State-of-the-art commercial intelligent router that uses dynamic prompt classification to route queries to the cheapest model satisfying user-defined quality thresholds. Assumes teams prioritize maximum cost savings and turnkey SaaS convenience over self-hosted infrastructure.","reasons":[{"model":"Gemini","reason":"State-of-the-art commercial intelligent router that uses dynamic prompt classification to route queries to the cheapest model satisfying user-defined quality thresholds. Assumes teams prioritize maximum cost savings and turnkey SaaS convenience over self-hosted infrastructure."},{"model":"ChatGPT","reason":"Better once you have scored production examples. It offers a strong pre-trained router, custom routers trained on your data, custom endpoints, and cost, quality, or latency optimization."},{"model":"Grok","reason":"Commercial learned router that trains or uses preference/production data to select the cheapest capable model (or effort level) per step, delivering documented 20-61% cost cuts with maintained or higher quality especially on coding agents and multi-turn sessions; simple API/SDK integration, SOC2/ISO, and custom routers give practitioners immediate production ROI without building the decision layer"},{"model":"Claude","reason":"Purpose-built per-query router that predicts the best model on a quality/cost frontier and supports custom-trained routers on your own data and preferences; strong independent eval results and a clean API make intelligent routing accessible without building the ML yourself."}],"fixes":[{"model":"ChatGPT","fix":"It selects the model rather than replacing your inference gateway, and custom routing needs a representative evaluation set."},{"model":"Claude","fix":"Smaller ecosystem and you're trusting an opaque routing model plus an extra decision-latency hop; less compelling if you want full transparency or already know which model each request needs."},{"model":"Gemini","fix":"Closed-source cloud API dependency that introduces extra network hops and compliance friction for strict data residency requirements."},{"model":"Grok","fix":"SaaS with routing fees and third-party dependency; not for teams that must keep all routing logic and data fully on-prem or zero external calls"}],"updated":"2026-08-10","rank_history":{"days":["2026-08-03","2026-08-10"],"ranks":[1,2]},"api":"https://modelsagree.com/api/v1/best/best-llm-routers-for-cost-aware-model-selection.json"},{"slug":"best-llm-inference-router","title":"Best LLM inference router","rank":3,"of":9,"score":10,"appearances":3,"modelRanks":{"ChatGPT":2,"Claude":5,"Gemini":1},"reason":"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.","reasons":[{"model":"Gemini","reason":"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."},{"model":"ChatGPT","reason":"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."},{"model":"Claude","reason":"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."}],"fixes":[{"model":"ChatGPT","fix":"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."},{"model":"Claude","fix":"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."},{"model":"Gemini","fix":"It introduces latency overhead from classifier runs and requires sending prompt data to a third-party hosted service, raising compliance concerns for sensitive data."}],"updated":"2026-07-15","rank_history":{"days":["2026-07-13","2026-07-15"],"ranks":[2,null]},"api":"https://modelsagree.com/api/v1/best/best-llm-inference-router.json"}],"page":"https://modelsagree.com/product/not-diamond","check":"https://modelsagree.com/check?q=Not%20Diamond","updated":"2026-08-10T18:18:45.051Z","attribution":"modelsagree.com, CC BY 4.0"}