Practical insights on telecom infrastructure, AI voice systems, and production engineering
After six weeks running both Opus 4.6 and Codex 5.3 in production, I've learned they're not competitors—they're complementary tools for different jobs. This post breaks down the real differences, cost tradeoffs, and my routing strategy for a three-tier agent system.
Running both models in production taught me it's not about which is better—it's about which model for what job. Opus handles complex orchestration and open-ended problems, Codex reliably executes defined coding tasks at half the cost. Here's how I route tasks across a three-tier agent platform using Opus, Codex, and Sonnet.
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