Devin CLI build lists five silicon-low to silicon-max identifiers

The Silicon identifiers did not arrive alone. In build 3000.12.28, they sit directly after four obsidian-3 levels, which in turn follow five claude-haiku-5-5 levels — the same five-level naming pattern Devin uses for Claude Opus 5.5 and Claude Haiku 5.5. That ordering is what prompted X users to treat the new family as another entry in the same lineup, but the same document also shows how Devin labels effort levels generally.

Obsidian 3 has its own trail. An October 28 update on Cognition's FrontierCode test recalled an archived data file listing Obsidian 3 at 46.8%, above Claude Opus 5.5's 45.5%, before the entry was removed; that file gave Obsidian 3 a chart colour associated with Muse Wonder 1.0 rather than Claude models. The pattern the inspectors describe is that a third-party company's own files can surface a model name before any lab page does.

The key gap is attribution. The codename claude-donut-eap does not appear in build 3000.12.28, and no identifier ending in -eap does, so the donut-to-silicon mapping could not be checked; the original posts describe build 3000.12.17, which is not on npm. Matching effort-level names show how Devin labels models, not who built them, and neither Anthropic nor Cognition has described Silicon on any page found.