Grok 4 Fast
GrokvFastDeprecatedReleased September 19, 2025
Deprecated May 15, 2026
37
OpenTools Scorenormalized /100
107
Valuescore / $M
Context2M tokens
Price (In / Out)$0.20/M / $0.50/M
CategoryMultimodal LLM
Max Output30K tokens
About Grok 4 Fast
Grok 4 Fast is a multimodal llm from xAI. Supports up to 2,000,000 token context window. Available from $0.20/M input tokens.
Capabilities
textvisioncode
Input Modalities
textimagefile
Output Modalities
text
Technical Details
- API Identifier
- x-ai/grok-4-fast
- Category
- Multimodal LLM
- Context Window
- 2,000,000 tokens
- Max Output Tokens
- 30,000 tokens
Tags
multimodalbudget-friendlylong-context
Benchmarks
Performance scores for Grok 4 Fast across standard benchmarks.
GPQA DiamondArtificial Analysis
60.6061%
AIME 2025Artificial Analysis
41.3333%
Pricing
Token pricing for Grok 4 Fast API usage.
Input Tokens
$0.20/M
per million tokens
Output Tokens
$0.50/M
per million tokens
Pricing Calculator
Input cost$0.20
Output cost$0.25
Estimated monthly cost$0.45
Cache read: $0.0500/M tokens
Tools by xAI
Other AI tools from the same organization.
AI Models by xAI
Large language models from the same organization.
| Model | Context Window | Price (In / Out per M) |
|---|---|---|
| Grok 4.20 Multi-AgentCurrent | 2.0M | $2.00 / $6.00 |
| Grok 4.20Current | 2.0M | $2.00 / $6.00 |
| Grok 4.1 FastDeprecated | 2.0M | Deprecated |
Related News
Latest coverage and updates.
Musk Says SpaceX-Anthropic Deal Is 180-Day Lease, Not 3-Year Commitment
May 29, 2026
OpenAI Acquires Voice-Cloning Startup Weights.gg in a Pre-IPO Cleanup
May 18, 2026
Anthropic's 80x Growth Sends It Scrambling for SpaceX Compute as Musk Becomes AI Landlord
May 8, 2026
Musk vs OpenAI Trial Begins With $150 Billion and AI Governance at Stake
Apr 27, 2026
OpenAI IPO Filing Set for This Week: What Builders Need to Know
May 21, 2026
Google, Microsoft, and xAI Open AI Models to US Government Security Reviews
May 6, 2026