Google Internally Tests Gemini 4 'Carbon' Checkpoint; Staff Say Coding Feels Like Opus 5.5

apples_jimmy · x · 2026-10-10

Business Insider reports Google employees are internally testing 'Carbon,' a new Gemini 4 checkpoint on its Jetski coding platform, while 'Argon' rolls out publicly. One employee says Carbon 'feels like Opus 5.5' for coding; early Argon versions were well received but seen as behind on some coding tasks, as Google races Anthropic and OpenAI in coding agents.

Related event: Google reportedly set to launch Gemini 4 'Argon' while testing 'Carbon' internally(7 posts)→

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