xAI model product
Grok 4 Heavy
Grok 4 Heavy is the multi-agent version of Grok 4, released alongside the standard model in summer 2025.
Updated Aug 12, 2026. Default version: Grok-4 Heavy
LLMBoard score68.2Grok-4 Heavy
Coverage80%6 benchmark families
Context windowN/ATokens
Official input priceN/AOfficial price unavailable
Grok 4 Heavy Specifications
Technical details for the model's default version.
- Version
- Grok-4 Heavy
- Released
- Unknown
- Knowledge cutoff
- Dec 31, 2024
- Parameters
- N/A
- Context window
- N/A
- Max output
- N/A
- Inputs
- image, text
- Outputs
- text
- Open weights
- No
- License
- Proprietary
Grok 4 Heavy Capability Profile
This profile uses the model's current scored version. Arena ratings and prices are shown separately.
Grok 4 Heavy Benchmark Results
Benchmark scores for Grok-4 Heavy.
| HMMT25 | 1.0 | 1 | 25 | 100.0% | C | |
| USAMO25 | 0.6 | 2 | 3 | 50.0% | C | |
| AIME 2025 | 1.0 | 4 | 114 | 97.3% | C | |
| LiveCodeBench | 0.8 | 11 | 73 | 86.1% | C | |
| Humanity's Last Exam | 0.5 | 19 | 93 | 80.4% | C | |
| GPQA | 0.9 | 28 | 234 | 88.4% | C |
Grok 4 Heavy Arena Results
Preference and agent-evaluation results for the default version.
No Arena results
The default version does not have a matching Arena result yet.
Grok 4 Heavy Pricing
Official vendor API pricing appears first, followed by individual provider offers.
- Official API
- N/A
- Official provider
- N/A
- Lowest third-party
- N/A
- Tracked offerings
- 0
No provider prices
The default version has no current input or output token prices.
Official prices use only the vendor's configured official Provider and positive standard USD PAYG rates. Third-party offers remain explicitly labeled.
Grok 4 Heavy Versions
Available versions of this model. The score column identifies the version used in the overall ranking.
| Grok-4 Heavy | N/A | 68.2 | N/A | N/A | N/A | No | Proprietary |
What is Grok 4 Heavy?
Key information about Grok 4 Heavy and its available data.
Grok 4 Heavy is the multi-agent version of Grok 4, released alongside the standard model in summer 2025. This system spawns multiple Grok 4 agents in parallel that work independently on problems and then collaborate by comparing their solutions, similar to a study group.
The agents share insights and tricks they discover, with the system intelligently combining their work rather than simply using majority voting. Grok 4 Heavy uses approximately 10x more test-time compute than regular Grok 4, enabling it to solve significantly more complex problems.
On the Humanities Last Exam, it achieves over 50% accuracy on text-only problems, and it scored a perfect result on the AIME 2025 mathematics competition. The system represents a major advancement in multi-agent AI collaboration and reasoning capabilities.
Data as of 2026-08-11.
Grok 4 Heavy vs nearby models
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FAQ
Common questions about Grok 4 Heavy.
When was Grok 4 Heavy released?
A release date is not available for the default version.
How much does Grok 4 Heavy cost?
No official standard PAYG price is currently available for Grok 4 Heavy.
Who created Grok 4 Heavy?
Grok 4 Heavy was created by xAI.
What is the context window for Grok 4 Heavy?
A context window is not available for the default version.
Is Grok 4 Heavy open weight?
No. The default version is not marked as having publicly available weights.
How many API providers offer Grok 4 Heavy?
No provider offering is currently linked to the default version.
What models should I compare Grok 4 Heavy with?
Nearby ranked alternatives include Seed 2.0 Pro, Claude Opus 4.5, Gemini 3.5 Flash Cyber.