xAI Proprietary Released Aug 28, 2025 Updated
Grok-4 Fast Reasoning
ToolsGuide Scores, rankings, test results and price.
Model summary
Summary
Grok-4 Fast Reasoning is xAI's model, released Aug 28, 2025. It's ranked in 2 categories and does best at text: #151 of 416, with a ToolsGuide Score of 304 against a median of 235.
It also ranks #143 of 147 for coding (148).
Its text and coding score uses votes only, because it has published fewer than two of the tests used for those categories.
It costs $0.20 per million input tokens and $0.50 per million output tokens, below the median text model ($0.43).
Specifications
- Creator
- xAI
- Licence
- Proprietary
- Released
- Aug 28, 2025
- Context window
- 2M tokens
- Input price
- $0.20 / 1M
- Output price
- $0.50 / 1M
- Tests reported
- 0
- Settings ranked
- grok-4-fast-reasoning, Grok 4 Fast (Reasoning)
Model comparison
Against the ten best text models.
Text score
ToolsGuide Score out of 1,000 · Higher is better
Coding score
ToolsGuide Score out of 1,000 · Higher is better
Input price
USD per 1M input tokens · Lower is better
Leaderboards
Where Grok-4 Fast Reasoning sits among the top 20 in each category.
Text
#151 of 416 · ToolsGuide Score out of 1,000, where 1,000 is a flawless model
Coding
#143 of 147 · ToolsGuide Score out of 1,000, where 1,000 is a flawless model
By task
Scored from votes on each kind of prompt alone, on the same 1,000-point scale.
Score against price
Text · the 10 priced models ranked closest · up and to the left is better value
Against its nearest rivals
Text prompts by kind · ToolsGuide Score from votes · hover for values
- Grok-4 Fast Reasoning
-
mimo-v2-flash (non-thinking) -
gpt-5-mini-high
Text
grok-4-fast-reasoning · hover a bar for its rank
Coding
Grok 4 Fast (Reasoning) · hover a bar for its rank
Test results
Grok-4 Fast Reasoning has no published test results yet, so its scores come from votes alone.