Model Tracker
Grok 4 Heavy
Grok 4 Heavy is an AI model made by xAI. xAI released it on 9 July 2025. It is generally available.
- Released
- 9 July 2025 — x.ai, read 16 October 2026
- Status
- Generally available — x.ai, read 16 October 2026
- Takes
- Not confirmed: The maker's pages consulted do not specify the input modalities for Grok 4 Heavy itself; specifications for Grok 4 or other models cannot confirm them.
- Returns
- Not confirmed: The maker's pages consulted do not specify the output modalities for Grok 4 Heavy itself; specifications for Grok 4 or other models cannot confirm them.
- Open weights
- Not confirmed: The maker's pages consulted do not state whether Grok 4 Heavy's weights are open or downloadable.
- Licence
- Not confirmed: The maker's pages consulted do not name a licence for Grok 4 Heavy.
- Context window
- Not confirmed: The maker's pages consulted do not print a context-window value for Grok 4 Heavy. Figures for Grok 4 or other models are not confirmed for Heavy.
- Longest answer
- Not confirmed: The maker's pages consulted do not print a standard maximum-output limit for Grok 4 Heavy.
- Knowledge cutoff
- Not confirmed: The maker's pages consulted do not state a knowledge-cutoff date for Grok 4 Heavy.
- API price, input
- Not confirmed: The maker's current API pricing page does not list a standard input-token price for Grok 4 Heavy.
- API price, output
- Not confirmed: The maker's current API pricing page does not list a standard output-token price for Grok 4 Heavy.
- Where
- Consumer app — x.ai, read 16 October 2026
- Parameters
- Not confirmed: The maker's pages consulted do not publish a parameter count for Grok 4 Heavy.
- Model card
- Not confirmed: The maker's pages consulted do not provide a Grok 4 Heavy model card or system card.
Questions
When was Grok 4 Heavy released?
xAI released Grok 4 Heavy on 9 July 2025.
Is Grok 4 Heavy still available?
Yes: it is generally available, as xAI states it.
More from xAI
- Grok 3
- Grok 3 (Think)
- Grok 3 mini
- Grok 3 mini (Think)
- Grok 4
- Grok 4 Fast
- Grok 4.1
- Grok 4.1 Fast
- Grok 4.20
- Grok 4.20 Multi-Agent Beta
- Grok 4.3
- Grok 4.5
- Grok 4.6
- Grok 4.7
- Grok Build 0.1
- Grok Code Fast 1
- Grok Imagine Image 2.0
- Grok Imagine Video 1.5
- Grok Voice 1.0
- Grok Voice 2.0
- Grok Voice 3.0
- Grok-1
- Grok-1.5V
- Grok-2
Sources
- Grok 4 (read 16 October 2026)
- Grok | xAI (read 16 October 2026)
- Grok Models & Pricing (read 16 October 2026)
- API Pricing (read 16 October 2026)