Google · Language model

Gemini 4 Carbon

Google's second Gemini 4 model, announced October 28, four weeks after Argon was announced. It debuted at #1 on Arena's text leaderboard and on Artificial Analysis's Intelligence Index v5, but at launch only selected cybersecurity defenders in Google's Fairwind Program can use it.

MakerGoogle
ReleasedOctober 28, 2026
API price (per 1M tokens)$2 in / $10 out
Open weightsNo

Google's planned introductory price, rising to $4 / $20 later. Not yet on sale: Google has given no public API date.

Best for

  • Security research and vulnerability work, once you can get access
  • Hard reasoning and long multi-step tasks
  • Teams already on Gemini who can wait for the wider rollout

Strengths

  • #1 on Arena text at launch (1528), ahead of Argon (1520) and Claude Opus 5.5 (1509)
  • 59 on the Artificial Analysis Intelligence Index v5, one point above Opus 5.5
  • Cheaper per index task than Opus 5.5 in Artificial Analysis's testing (about $7.76 vs $10.04)

Watch out for

  • No API, AI Studio or Gemini app access for the public yet, and no date
  • #4 on Arena WebDev, behind Claude Opus 5.5
  • Google's cybersecurity benchmark scores ran without guardrails and haven't been reproduced independently

Ranking history

EditionPower RankingsCodingBest ValueOpen-Weight WatchImage GenerationVideo Generation
Week 45, 2026#2 (95)#5 (90)————

Head-to-head