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Google reportedly tests Gemini 4 checkpoint Carbon, coding said to feel like Opus 5.5

A leak claims Google employees are testing a newer Gemini 4 checkpoint called Carbon, with testers saying its coding feels like Opus 5.5, which if true could mean Gemini handles both multimodal and coding work.

Layton Gott
@Layton_GottArchived 20 days agoOriginally posted 2026.10.11
Google reportedly tests Gemini 4 checkpoint Carbon, coding said to feel like Opus 5.5
Layton Gott @Layton_GottOriginally posted 2026.10.11
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Google might already have an Opus 5.5-level coding model... and it isn't Gemini 4 Argon. Google employees are testing a newer Gemini 4 checkpoint called Carbon. one tester said it “feels like Opus 5.5” for coding. another: “Carbon is really good!” Opus 5.5 is still my favorite coding model ever... but Gemini has never really had Claude's or ChatGPT's reputation for coding. Gemini has always been heavily trained as an everyday model. > multimodal. > huge context. > research. > Google's entire ecosystem. > science now imagine THAT model also being Opus-level at coding. you wouldn't have to pick: Claude for serious coding. Gemini for basically everything else. you could just use Gemini for both. and we haven't even properly gotten Argon yet. Carbon is already newer. if those early coding reports are real... Google might finally have the model that does everything. Will Google seriously make a comeback?

x.com/layton_gott/status/2108955415262208343Archived 2026.10.12 09:57