THE VERDICT
● Kimi Vivace ($199) for heavy agent and coding work at the lowest cost per unit of capacity.
● SuperGrok Heavy ($300) only if live X access is genuinely part of your work. That is the one thing money cannot buy elsewhere.
● Neither, most likely. These tiers solve one problem: you keep running out. If you have not been blocked this month, you are buying nothing.
Head to head
|
Kimi Vivace |
SuperGrok Heavy |
| Price |
$199/mo, $159 annually |
$300/mo |
| Tier below it |
Allegro at $99 |
SuperGrok at $30 |
| Real-time data |
No |
Live X access |
| Agent tooling |
Agent Swarm, Kimi Code |
Grok agents, Grok Build |
| Independent score |
Vendor benchmarks only |
Grok 4.6 at AA Index 61 |
| Free tier below |
Adagio, K2.6 unlimited chat |
~10 messages per 2 hours |
| Ecosystem reach |
Narrower |
Cursor, X, OpenRouter, Vercel, Cloudflare |
THE CHEAPER ANSWER NOBODY SELLS YOU
Two complementary subscriptions at 20 to 40 dollars each frequently beat one power tier, because the ceiling you hit is usually specific to one model rather than to capacity in general. Kimi Allegretto at $39 plus SuperGrok at $30 is $69 — less than a quarter of Heavy, and it removes two different constraints instead of raising one.
Where each one earns its price
Vivace is the better value per unit of capacity. The ladder beneath it is gentler — Adagio free, Moderato $19, Allegretto $39, Allegro $99 — so by the time you reach $199 you have had four chances to discover the right tier. Annual billing takes it to $159.
SuperGrok Heavy has one argument and it is a real one: live access to X. For anyone working on breaking news, market sentiment or public reaction, no amount of general capability substitutes for a current feed. Grok 4.6 also scores 61 on the Artificial Analysis Intelligence Index, level with GPT-5.6 Sol, so you are not trading capability for recency. What you are paying is a 10x jump from the $30 tier for headroom rather than capability.
Who should pick which
| If you are... |
Pick |
| Running agent swarms all day |
Kimi Vivace, best capacity per dollar |
| Working on breaking news or sentiment |
SuperGrok Heavy. Nothing else has the feed |
| Not sure you need either |
Allegretto $39 plus SuperGrok $30. Same coverage, $69 |
| Working in Cursor |
Grok side. Kimi has no Cursor integration |
| Building on API rather than chatting |
Neither. Both bill API separately from membership |
FAQ
Is SuperGrok Heavy worth $300?
Only for live X access or if you are consistently hitting SuperGrok limits at $30. It is a capacity purchase, not a capability one.
Does Vivace include API tokens?
No. Kimi bills membership and API separately, and neither grants the other.
Which has better independent evidence?
Grok. Grok 4.6 carries an Artificial Analysis Intelligence Index score of 61. Kimi's figures are vendor-published and awaiting replication.
What about Grok 4.7?
No model ID at docs.x.ai, no published price, no benchmark card. Musk indicated early to mid September while xAI runs supplemental training on SpaceX engineering data. Do not buy a tier for a model that has not shipped.