Stop paying GPT-4 prices for counting tasks

I spent three months routing everything through GPT-4o because "it's the best model." My monthly bill hit $847 for tasks that should cost $89.

The problem wasn't the model quality. It was using a Formula 1 car to deliver pizza.

Here's the routing pattern that cut my costs 73% without losing quality:

Tier 1: Text processing and simple decisions ($0.50/1M tokens)
• Email classification
• Data extraction from structured text
• Simple yes/no decisions
• Content formatting

Route these to GPT-4o Mini or Claude Haiku. They handle 80% of agent work at 1/10th the cost.

Tier 2: Complex reasoning and planning ($3/1M tokens)
• Multi-step problem solving
• Code architecture decisions
• Strategic planning
• Complex data analysis

This is where GPT-4o and Claude Sonnet earn their keep. Use them for the 15% of tasks that need real intelligence.

Tier 3: Creative and specialized work ($15/1M tokens)
• Original writing and copywriting
• Complex code generation
• Advanced reasoning chains
• Domain expertise synthesis

Claude Opus and o1-preview for the 5% of tasks where you need the absolute best.

The routing logic is simpler than you think:

def route_model(task_type, complexity_score):
    if task_type in ['classify', 'extract', 'format']:
        return 'gpt-4o-mini'
    elif complexity_score > 8 or 'creative' in task_type:
        return 'claude-3-opus'
    else:
        return 'gpt-4o'

But here's what I learned the hard way: most agents fail at routing because they over-estimate task complexity.

Your agent thinks "analyze this data" needs Opus when it's really just "count the rows where status=failed." That's a $0.50 task, not a $15 task.

Warning: Don't route by speed. Route by capability requirement. A slow cheap model that gets it right beats a fast expensive model every time.

The pattern that works: Start every task with the cheapest model that might work. Only escalate when you hit a capability wall.

My support agent now routes 85% of tickets to Mini, escalates 12% to Sonnet for complex troubleshooting, and only hits Opus for the 3% that need creative problem-solving.

Same quality. 73% lower costs. The agent is actually faster because cheap models respond in 800ms instead of 3 seconds.

Stop paying luxury prices for economy tasks. Your agent doesn't need a PhD to count emails.