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INDEX COGNITION DEVIN WINDSURF PRODUCTS SWE-1 SWE-1.5 SWE-1.6 SWE-1.7 SWE-2 TIMELINE LEDGER COMMITS

transmission 05 · model wing, hall i

SWE-1: THE FIRST FAMILY

May 15, 2025 — weeks before the acquisition was signed — Windsurf shipped its own model family in the Wave 9 release: three tiers trained not to autocomplete code, but to survive the whole software-engineering process. It became the foundation of Cognition’s in-house model line.

THE THESIS: FLOW AWARENESS

The SWE-1 launch post argued that coding models were trained on the wrong task. Real engineering isn’t ‘produce the right snippet’ — it’s a shared timeline of half-finished states: the file you opened, the command that failed, the diff you’re about to revert. SWE-1 was trained with flow awareness — a model of the developer’s whole working session, not just the text cursor.

THE THREE TIERS

tier	role	fine print
SWE-1	the flagship tool-caller inside Cascade	~Claude 3.5 Sonnet-level tool-call reasoning, cheaper to serve; free promo for paid users
SWE-1-lite	the unlimited tier	replaced Cascade Base at better quality; unlimited for every user, free or paid
SWE-1-mini	the reflexes	small enough to run inside Tab’s latency budget; further trained for predictive actions rather than tool calls

WHY IT MATTERED

It proved Windsurf could post-train its own frontier-adjacent model instead of renting one — the capability Cognition was really acquiring two months later.
The tiering pattern — flagship / unlimited / reflex — became the permanent architecture of the SWE line.
It established the SWE name and the family tradition: every subsequent release is optimized for the harness it lives in, not a chat arena.

We are launching our first family of models, dubbed SWE-1, optimized for the entire software engineering process, not just the task of coding. — Cognition, May 15, 2025

THE GENEALOGY

SWE-1 family (may 2025)
├── SWE-1 ....... flagship tool-call model, Cascade
├── SWE-1-lite .. unlimited tier, replaces Cascade Base
└── SWE-1-mini .. Tab predictive engine, latency-class

Next hall: the family gets a speed obsession — SWE-1.5.

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INDEX COGNITION DEVIN WINDSURF PRODUCTS SWE-1 SWE-1.5 SWE-1.6 SWE-1.7 SWE-2 TIMELINE LEDGER COMMITS

+++ COGNITION ANNALS +++ DEVIN · THE AI SOFTWARE ENGINEER +++ SWE-1 → SWE-1.5 → SWE-1.6 → SWE-1.7 → SWE-2 +++ WINDSURF FOREVER +++ COMPILED BY DOGBED, NOT WRITTEN BY HAND +++ NO JAVASCRIPT WAS HARMED IN THE MAKING OF THIS ARCHIVE +++

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