Frontier Models

open vs closed ai founders techcrunch disrupt 2026 a stable door with its top half open

Open or Closed AI? How Founders Are Choosing What to Build On at TechCrunch Disrupt 2026

Four TechCrunch Disrupt 2026 sessions, from Together AI, CapitalG and Pathway to Oumi, Nvidia and Ricursive Intelligence, tackle how founders choose between frontier APIs and open-weight models. We explain what open and closed really mean, what Menlo Ventures’ data and current list prices show, and give a five-question framework for deciding what to rent, customise or own.

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Visa Ships a Security AI That Patches Your Code Before Any Human Reviews It

Visa has open-sourced the Visa Vulnerability Agentic Harness, the tooling it used to hunt for bugs across its own payment network, and its documentation contains a line worth pausing on: “A plain scan edits your code.” In its default configuration the harness runs discovery, remediation and validation end to end, writing candidate fixes straight into source files before any person has looked at the finding or the patch. Nothing reaches production without a human, but nobody approves the patch before it is written. This breakdown covers the four-phase, eleven-stage pipeline, exactly where the “no human review” claim holds and where it collapses, what Visa itself says about oversight, and the independent evidence that only 26% of AI-generated security patches fix the flaw without changing what the software does.

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