July 2026 might be the most confusing month in AI model history. Anthropic shipped Opus 5. OpenAI dropped the GPT-5.6 family with three tiers (Sol, Terra, Luna). Google pushed Gemini 3.1 Pro Preview. And every one of them claims to be "the best."
If you're building with AI—especially using coding agents like Claude Code, Codex, or Cursor—you're probably asking the same question I was six months ago: which model should I actually use?
The answer that saved me $7K/month: it depends on the task.
The Problem: One Model Doesn't Fit All
Here's what my API bills looked like before I got smart about model selection:
