QUICK VERDICT — AUGUST 2026
● Price gap: $200/month — SuperGrok Plus $100 vs Heavy $300
● Model difference: Heavy adds Grok 4 Heavy (multi-agent). Plus has Grok 4.5 only.
● Usage: Heavy — maximum pool. Plus — significantly higher than standard (not maximum).
● Grok 4 Heavy access: Heavy only — 100% AIME 2025, 88.9% GPQA Diamond.
● Grok Voice TF 2.0: Both.
● Grok Build: Both.
● Grok Imagine: Both.
● Priority access: Both — Heavy has higher priority during peak.
The $200/month premium for SuperGrok Heavy over SuperGrok Plus buys one thing: Grok 4 Heavy. Per AI Business Weekly's verified August 2026 breakdown, Grok 4 Heavy is xAI's multi-agent reasoning architecture where multiple AI specialists tackle different parts of a task simultaneously — it scored 100% on AIME 2025 and 88.9% on GPQA Diamond. For most workflows, Grok 4.5 (available in both tiers) is the operative model. The question is whether your specific workload — quantitative research, intensive multi-step reasoning, heavy agentic pipelines — benefits from Grok 4 Heavy's architecture enough to justify $2,400/year more than Plus.
SuperGrok Plus ($100) for: Users who need more than standard SuperGrok capacity but do not need Grok 4 Heavy. Covers all xAI consumer features — Grok 4.5, Voice TF 2.0, Build, Imagine — at higher limits than the $30 plan. Right choice if you consistently hit $30 plan limits and do not run intensive multi-agent reasoning tasks.
SuperGrok Heavy ($300) for: Users who specifically need Grok 4 Heavy for multi-agent work, quant research, or intensive reasoning tasks where the benchmark scores (100% AIME, 88.9% GPQA Diamond) translate to real workflow value. The $300 promotional rate drops to $99/month for the first 3 months — worth evaluating Heavy at that rate before committing to the full price.
Sources: FelloAI pricing guide · AI Business Weekly · Related: SuperGrok Plus full review → · SuperGrok Heavy vs Claude Max →