Gemini 4 Carbon leads the Intelligence Index v5 and sits 3 points behind Claude Code with Opus 5.5 on coding agents, at about 23% lower cost per task. Access is limited to selected users for now.
Terms in this piece · Glossary
AI agent — An AI system that doesn't just answer once but works toward a goal in a loop — taking actions, reading the results, and deciding what to do next.
token — The chunk of text a model reads and writes in — roughly three-quarters of a word — and the unit AI usage is billed in.
hallucination — When a model states something false with full confidence — inventing facts, citations, or APIs that don't exist.
