Add A3M Router - parallel multi-LLM execution AI gateway

[Das-rebel]

Add A3M Router to AI Gateways (Open Source)

Why it belongs here:

• Parallel multi-LLM execution with confidence scoring (unique — no other gateway does this)
• 47+ providers including OpenAI, Anthropic, Groq, DeepSeek, NVIDIA
• 62% cost savings via smart routing
• 99.5% routing accuracy with 12-signal RouteLLM-style routing
• Semantic cache, circuit breaker, budget enforcement
• 19.5 KB, zero ML dependencies
• Independent third-party benchmark validation (138ms baseline, +96ms proxy overhead)

npm: adaptive-memory-multi-model-router (10K+ downloads in 14 days)

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🏆 RouterArena #1 — 🏆 RouterArena #1: A3M scored 76.43 on the official LLM router benchmark — beating Microsoft Azure (71.87), OpenAI GPT-5 (64.32), and RouteLLM (48.07). Results: RouteWorks/RouterArena#113

[Das-rebel]

Update: A3M Router just achieved 🥇 #1 on the RouterArena leaderboard (0.7643 score), independently validating its cost-efficiency and routing quality against 16 other routers including Azure, NotDiamond, and RouteLLM.

Full results →

[Das-rebel]

Hi! Following up on this PR. A3M Router v2.14 has been released with significant improvements. Let me know if any changes are needed to the submission. Thanks!

[Das-rebel]

Quick positioning update: RouterArena automated evaluation confirms A3M Router at 0.9404 score / 96.77% accuracy, $0.0768/1K queries, and 1.0000 robustness with 0 abnormal entries across 8,400 queries. This positions A3M as No. 1 in accuracy, No. 1 in cost, and No. 1 in robustness among known public baselines: about 2.3× cheaper than Sqwish, 3.5× cheaper than RouteLLM, and ~130× cheaper than GPT-5.