# Google unveils Gemini 4 Carbon, topping benchmarks with lowest hallucination rate

Digest AI · Generative AI & Models · published 2026-11-03T13:00:00Z

Canonical: https://digestai.news/story/google-unveils-gemini-4-carbon-topping-benchmarks-with-lowest-hallucin

## Summary

Google released **Gemini 4 Carbon**, its latest AI model, which topped the **Artificial Analysis Intelligence Index V5** benchmark, scoring **59**—one point ahead of **Claude Opus 5.5** and two points above **OpenAI’s GPT-6 Astra**. It also led in **four of nine evaluations** and offered lower cost-per-task pricing than competitors like **Claude Opus 5.5** and **Sonnet 5.5**, though still more expensive than **GPT-5 Astra** or **DeepSeek V4.1 Flash 1017** (ranked **32** on the index). The model’s standout feature is its performance on the **AA-Omniscience v1.1** test, which measures hallucinations and factual recall, scoring **54**—the highest among frontier models in 2026, though still far from perfect on a **-100 to +100** scale.

Google is rolling out **Gemini 4 Carbon** cautiously, prioritizing cybersecurity applications through its **Fairwind program** for cyber defenders before broader availability. Google’s controlled release mirrors **Anthropic’s approach** with **Mythos** in 2025, emphasizing safety and government collaboration for pre-release testing. While **Gemini 4 Carbon** excels in general intelligence and reliability, it trails **Claude Code** in programming tasks and **Grok 4.7**, **Muse Wonder**, and **Kimi K3.1 Pro** in knowledge-based work.

## Key points

- Gemini 4 Carbon scores **59** on Intelligence Index V5, surpassing Claude Opus 5.5 by **1 point** and GPT-6 Astra by **2 points**
- Model claims **54** on AA-Omniscience v1.1, the highest hallucination score among 2026 frontier models on a **-100 to +100** scale

## Why it matters

Gemini 4 Carbon’s balance of cost, performance, and reliability could shift enterprise adoption, especially for security-focused use cases where hallucinations and overreach are critical risks. Its cautious rollout signals growing industry awareness of safety trade-offs in AI deployment.

## Sources

1. [Google reveals new Gemini 4 Carbon AI model, narrowly beating Claude Opus 5.5 — frontier AI model is also the least likely to hallucinate, benchmarks claim](https://tomshardware.com/tech-industry/artificial-intelligence/google-reveals-new-gemini-4-carbon-ai-model-narrowly-beating-claude-opus-5-5-frontier-ai-model-is-also-the-least-likely-to-hallucinate-benchmarks-claim) (Tom's Hardware, 2026-11-03)

Part of the developing story: [Google DeepMind Advances World Models and Gemini Benchmarks](https://digestai.news/thread/google-releases-genie-3-world-model-with-720p-24fps-limits) (4 stories)

## Cite

Digest AI, "Google unveils Gemini 4 Carbon, topping benchmarks with lowest hallucination rate", 3 November 2026, https://digestai.news/story/google-unveils-gemini-4-carbon-topping-benchmarks-with-lowest-hallucin

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