Gemini 4 Carbon reportedly reaches Opus 5.5-level coding performance

Google is testing Gemini 4 Carbon on its internal Jetski coding platform, where one employee said its programming performance compares with Anthropic’s Opus 5.5. That would mark a step up from Argon, whose coding drew mixed employee feedback, as covered in reports that Gemini 4 Argon faced staff skepticism over coding. Carbon remains an internal build, and the comparison needs more testing.
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