How I Cut My AI API Bill by 40% Without Changing a Single Line of Application Code

Short summary

Developer consolidated multiple LLM providers (GPT, Claude) through a single gateway API, reducing costs by 40% without changing application code—just a base_url swap. The real savings came from centralizing usage visibility, revealing that cheaper models like DeepSeek could replace GPT for classification tasks at 35x lower cost. The approach trades slightly higher latency (50-150ms) for cost visibility and flexibility; best suited for multi-provider setups.

• •Unified multiple LLM providers through an API gateway with a single base_url change
• •Achieved 40% cost reduction: 15% flat discount plus 35x savings from model switching visibility
• •Tradeoff: 50-150ms added latency for centralized billing and flexible model selection

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