Processing 735 central bank speeches through an AI model cost $4.

That's four years of Federal Reserve and ECB speeches, run through OpenAI's gpt-5.1 to extract sentiment across five dimensions — policy stance, uncertainty, forward guidance, topic focus, market predictions.

The tool: OpenAI's Batch API. It gives a 50% discount versus the real-time API and bypasses standard rate limits. Any analyst can build these kinds of indicators now.