Grok 4 Fast (Reasoning)
SpaceXAIGrokProprietary
Description
Pushing the Frontier of Cost-Efficient Intelligence. Grok-4 Fast Reasoning is a high-speed variant of Grok-4 optimized for faster inference while maintaining strong reasoning capabilities through thinking tokens.
Release Date
2025-09-19
Parameters
—
Context Length
—
Modalities
image, text
Capability Radar
38
general
83
coding
89
reasoning
65
science
87
agents
80
multimodal
Rankings
| Domain | #Rank | Score | Source |
|---|---|---|---|
| Code Ranking | 193 | 68.0 | AA |
| General Ranking | 200 | 54.0 | AA |
| Science | 202 | 59.0 | AA |
Benchmark Scores (LLM Stats)
(LLM Stats (zeroeval))No benchmark data available
AA Evaluation Indices
(Artificial Analysis)Math Index(Artificial Analysis)89.7
Aime 25(MAA (Mathematical Association of America))89.7
Mmlu Pro(TIGER-Lab (Univ. of Waterloo, Toronto, CMU, 2024))85.0
Gpqa(NYU + Cohere + Anthropic (2023))84.7
Livecodebench(UC Berkeley + MIT + Cornell (2024))83.2
Lcr(Artificial Analysis)73.7
Tau2(Sierra + U Toronto + Vector Institute (2025))65.8
Ifbench(Google Research (2023))50.5
Hle(Center for AI Safety + Scale AI (2025))19.1
Terminalbench Hard(Stanford × Laude Institute (2026))18.9
Intelligence Index(Artificial Analysis)17.9
LLM Stats Category Scores
(LLM Stats (zeroeval))No category score data available
Pricing
Input Price$0.2 / 1M tokens
Output Price$0.5 / 1M tokens
Blended Price (3:1)$0.275 / 1M tokens
Speed
Tokens/sec0.0
Time to First Token0.00s
Time to Answer0.00s
Provider Price Ranking
Provider Price Ranking
5 providers
Cheapest: xAIMost Expensive: 302.AI
ProviderInputOutput
1xAICheapest
$0
$0
2Jiekou.AI
$0.18
$0.45
3Helicone
$0.2
$0.5
4SpaceXAIPRIMARY
$0.2
$0.5
5302.AI
$0.2
$0.5
Compare pricing across different API providers for this model.