OpenAI published a customer case study on October 2, 2026, describing how Chatham Financial, a capital markets advisory firm, uses OpenAI's Codex and GPT-5.6 models across its advisory workflows, including a trade validation application the firm says reduced review time from approximately 30 minutes to under four. The case study lists Chatham as a small and medium-sized business in the finance industry in North America, with ChatGPT, Codex, and the OpenAI API as the products in use. The firm…
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