Google reportedly set to launch Gemini 4 'Argon' while testing 'Carbon' internally

According to internal documents and screenshots obtained by Business Insider, Google is preparing to roll out its new model Gemini 4 "Argon" to the public. At the same time, several employees are internally testing a more powerful version codenamed "Carbon", possibly a new checkpoint of Argon, which has already gone live on internal coding platforms (such as Jets). This remains a media-reported leak about internal testing; Google has not officially confirmed it, but if true, it signals that the iteration pace of Gemini 4 is clearly accelerating.

Confirmed

• Business Insider saw the relevant internal documents and screenshots and published its report based on them (m1, m5, etc.).
• The report says Google is about to release Gemini 4 "Argon" to the public.
• A new version codenamed "Carbon" is being tested internally, possibly a new checkpoint of Argon, and has been made available to employees on internal coding platforms.
• Some employees reported that Carbon's coding ability feels "like Opus 5.5", i.e., on par with Anthropic's Opus 5.5; the leak mentioned in m4 says multiple Google employees made similar comments.

Not Yet Confirmed

• The exact release date of "Argon" has not been announced.
• The relationship between "Carbon" and "Argon" (whether it is a checkpoint of the same model) is only speculation.
• "Coding on par with Opus 5.5" comes from subjective descriptions by internal employees, with no public benchmarks to back it up.

Why It Matters

• The leak shows that Google is already pushing forward with the next checkpoint internally even before Gemini 4's official release, suggesting the frontier-model race has entered a rapid-iteration phase.
• The direct comparison to Anthropic's Opus 5.5 reflects that coding capability has become a core battleground among top-tier models, making subsequent official releases and real-world benchmarks well worth watching.

2026-10-10 ~ 2026-10-10 · 7 related posts

Full story(4 episodes)→

• Episode 1: Google Unveils Gemini 4 Argón with Focus on Deep Reasoning(2026-10-07, 2 posts)
• Episode 2: Gemini 4 Argon's Delayed Rollout Fuels Speculation of Weekend Release(2026-10-07, 4 posts)
• Episode 3: Gemini 4 Argon Surfaces Across Google Platforms Ahead of Launch(2026-10-09, 3 posts)
• Episode 4: Google reportedly set to launch Gemini 4 'Argon' while testing 'Carbon' internally(2026-10-10, 7 posts)

• [source] Google reportedly testing Gemini 4 "Carbon" internally; staff say coding "feels like Opus 5.5" — gaganghotra_ · 2026-10-10
• Rumor: Google's New 'Carbon' Model Reportedly Matches Opus-Level Coding — Independent-Wind4462 · 2026-10-10
• Google reportedly testing Gemini 4 checkpoint 'Carbon' that matches Opus 5.5 in coding — BLUECOW009 · 2026-10-10
• [source] Google to roll out Gemini 4 "Argon" soon; internal "Carbon" model reportedly rivals Opus — ChrisGPT · 2026-10-10
• Leak: Google already testing 'Carbon' checkpoint approaching Opus 5.5 before Gemini 4 ships — rickasaurus · 2026-10-10

2 near-duplicate retellings: apples_jimmy · ShikharMurty