Balyasny Asset Management has 97% of its firm using an internal AI platform built around OpenAI's Codex, with GPT-5.5 as the core engine. Charlie Flanagan, speaking for the firm, credits GPT-5.5 specifically for expanding both the intelligence ceiling and the volume of work the system can handle.
The platform touches three domains: investment research, coding, and back office automation. This is not a pilot program or a single-team experiment. It is firm-wide adoption at a hedge fund where research quality and operational speed are directly tied to returns.
The firm is treating 2026 as the year Codex-enabled workflows become standard operating procedure. The full video is worth watching for how a capital-markets firm with real stakes describes what GPT-5.5 actually changed, not just that it did.
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