OpenAI, Claude, Gemini Compatible Summarization API in Node.js (One Contract)

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Implement a summarization API in Node.js to extract costs from invoices using OpenAI, Claude, or Gemini models

intermediate Published 27 Sept 2026

Action Steps

Choose a default model by comparing short and long invoices
Implement a narrow chat contract between invoice preparation and field validation
Record the returned cost against the tenant that initiated the call
Use the API to extract costs from invoices
Compare the performance of different models (OpenAI, Claude, Gemini)

Who Needs to Know This

Developers and platform teams can benefit from this API to automate invoice processing and cost extraction

Key Insight

💡 Use a narrow chat contract to extract costs from invoices while keeping provider selection outside the marketplace's extraction logic

Key Takeaways

Implement a summarization API in Node.js to extract costs from invoices using OpenAI, Claude, or Gemini models

Full Article

Short answer: put a narrow OpenAI-style chat contract between invoice preparation and field validation, then record the returned cost against the tenant that initiated the call. Choose the default model only after comparing representative short and long invoices. This keeps provider selection outside the marketplace's extraction logic while preserving the one number the platform team needs: cost per tenant. The decision is about boundary placement, not a universally best model. The app

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