Josh Rosen says the job is to build System 1.5: connect fast models to frontier reasoning via software

iamrobotbear · x · 2026-09-22

Josh Rosen lays out an architecture thesis: build "System 1.5" by wiring System 1 (fast small models) to System 2 (frontier reasoning models) with solid software architecture and deterministic connective tissue. The take was amplified by sydneyrunkle.

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