ccMarvin vs INT21

Marvin watches every company you back, private or public, and delivers the signals that matter: exec changes, acquisitions, product releases, funding rounds. Straight to...

We are building self-improving AI systems for the software beneath modern AI. Our first product generates and optimizes low-level GPU software, then proves its work with...

About ccMarvin

Marvin watches every company you back, private or public, and delivers the signals that matter: exec changes, acquisitions, product releases, funding rounds. Straight to your inbox. Research, summaries, planning help, and life analysis, delivered to your inbox. 2026-09-07, Teased the Grok 5 training run, "biggest cluster yet", and said the Cybercab line is running ahead of schedule. 2026-09-06, Essay follow-up: interpretability results are moving into production Claude models.

About INT21

We are building self-improving AI systems for the software beneath modern AI. Our first product generates and optimizes low-level GPU software, then proves its work with tests and benchmarks. Today, we are launching INT21: the first company to achieve self-improving AI agent swarms, applied to AI infrastructure. That software has an outsized effect on speed and cost. The first four implementations produced by PTX Kernel Factory are open source today. The product is also entering beta, with early access available at int21.ai.