Google reportedly testing Gemini 4 "Carbon" internally; staff say coding "feels like Opus 5.5"
gaganghotra_ · x · 2026-10-10
- According to internal documents and screenshots seen by Business Insider, Google is testing a new Gemini 4 version called Carbon with employees — likely a new checkpoint of the publicly announced Argon — available on the internal coding platform Jetski.
- One employee said Carbon "feels like Opus 5.5" for coding, referencing Anthropic's top agentic coding model, while noting more testing is needed; earlier Argon versions were seen as behind on some coding tasks.
- The report shows Google iterating fast after Gemini 4's late-September launch, racing to catch Anthropic and OpenAI in AI coding agents.
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