Gemini 4 Argon opens to subscribers: benchmarks reflect HIGH mode, not default

Google opened Gemini 4 Argon to AI Pro ($19.99/month) and AI Ultra ($99.99/month) subscribers on October 13, 2026, via the Gemini app and AI Mode in Search. On Artificial Analysis's independent Intelligence Index, Argon scored 52.56 in HIGH mode, trailing Claude Opus 5.5 (57.62) and Sonnet 5.5 (56.00), but posted the lowest hallucination rate at 15%.

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Gemini 4 Argon opens to subscribers: benchmarks reflect HIGH mode, not default

Argon access opens to AI Pro at $19.99 and AI Ultra at $99.99 per month
Artificial Analysis Intelligence Index: 52.56 in HIGH mode vs 57.62 for Claude Opus 5.5
15% hallucination rate — lowest among models scoring above 45 on the index
Unified 1,048,576-token context window shared across prompt, reasoning and output

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