Grok 4.1 Fast (Non-reasoning) logo
xAI
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Proprietary model

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Released November 2025

Grok 4.1 Fast (Non-reasoning) Intelligence, Performance & Price Analysis

API Provider Benchmarks

Model summary

Intelligence

24
Artificial Analysis Intelligence Index
4 out of 4 units for Intelligence.

Speed

92.1
Output tokens per second
2 out of 4 units for Speed.

Input Price

$0.20

USD per 1M tokens

2 out of 4 units for Input Price.

Output Price

$0.50
USD per 1M tokens
2 out of 4 units for Output Price.

Verbosity

4.4M
Output tokens from Intelligence Index
1 out of 4 units for Verbosity.

Grok 4.1 Fast (Non-reasoning) is amongst the leading models in intelligence and reasonably priced when comparing to other non-reasoning models of similar price. It's also slower than average, however highly concise. The model supports text and image input, outputs text, and has a 2m tokens context window.

Grok 4.1 Fast (Non-reasoning) scores 24 on the Artificial Analysis Intelligence Index, placing it well above average among comparable models (averaging 16). When evaluating the Intelligence Index, it generated 4.4M tokens, which is very concise in comparison to the average of 8.4M.

Pricing for Grok 4.1 Fast (Non-reasoning) is $0.20 per 1M input tokens (moderately priced, average: $0.24) and $0.50 per 1M output tokens (moderately priced, average: $0.71). In total, it cost $21.37 to evaluate Grok 4.1 Fast (Non-reasoning) on the Intelligence Index.

At 92 tokens per second, Grok 4.1 Fast (Non-reasoning) is slower than average (97).

ReasoningNo

This page shows the non-reasoning version of this model.

A reasoning variant may also exist.

Input modality

Supports: text, image

Output modality

Supports: text

Context window2m
~3000 A4 pages of size 12 Arial font

Metrics are compared against models of the same class:

  • Non-reasoning models → compared only with other non-reasoning models
  • Reasoning models → compared across both reasoning and non-reasoning
  • Open weights models → compared only with other open weights models of the same size class:
    • Tiny: ≤4B parameters
    • Small: 4B–40B parameters
    • Medium: 40B–150B parameters
    • Large: >150B parameters
  • Proprietary models → compared across proprietary and open weights models of the same price range, using a blended 3:1 input/output price ratio:
    • <$0.15 per 1M tokens
    • $0.15–$1 per 1M tokens
    • >$1 per 1M tokens

Highlights

Intelligence
Artificial Analysis Intelligence Index · Higher is better
Speed
Output tokens per second · Higher is better
Price
USD per 1M tokens (3:1 input-output ratio) · Lower is better

Intelligence

Artificial Analysis Intelligence Index

Artificial Analysis Intelligence Index v4.0 incorporates 10 evaluations: GDPval-AA, 𝜏²-Bench Telecom, Terminal-Bench Hard, SciCode, AA-LCR, AA-Omniscience, IFBench, Humanity's Last Exam, GPQA Diamond, CritPt
Reasoning models are indicated by a lightbulb icon

Artificial Analysis Intelligence Index v4.0 includes: GDPval-AA, 𝜏²-Bench Telecom, Terminal-Bench Hard, SciCode, AA-LCR, AA-Omniscience, IFBench, Humanity's Last Exam, GPQA Diamond, CritPt. See Intelligence Index methodology for further details, including a breakdown of each evaluation and how we run them.

Artificial Analysis Intelligence Index by Open Weights / Proprietary

Artificial Analysis Intelligence Index v4.0 incorporates 10 evaluations: GDPval-AA, 𝜏²-Bench Telecom, Terminal-Bench Hard, SciCode, AA-LCR, AA-Omniscience, IFBench, Humanity's Last Exam, GPQA Diamond, CritPt
Reasoning models are indicated by a lightbulb icon

Artificial Analysis Intelligence Index v4.0 includes: GDPval-AA, 𝜏²-Bench Telecom, Terminal-Bench Hard, SciCode, AA-LCR, AA-Omniscience, IFBench, Humanity's Last Exam, GPQA Diamond, CritPt. See Intelligence Index methodology for further details, including a breakdown of each evaluation and how we run them.

Indicates whether the model weights are available. Models are labelled as 'Commercial Use Restricted' if the weights are available but commercial use is limited (typically requires obtaining a paid license).

Intelligence Evaluations

Intelligence evaluations measured independently by Artificial Analysis · Higher is better
Results claimed by AI Lab (not yet independently verified)
GDPval-AA
Terminal-Bench Hard
𝜏²-Bench Telecom
AA-LCR
AA-Omniscience Accuracy
AA-Omniscience Non-Hallucination Rate
Humanity's Last Exam
GPQA Diamond
SciCode
IFBench
CritPt
APEX-Agents-AA
No data available
MMMU-Pro
Reasoning models are indicated by a lightbulb icon.

While model intelligence generally translates across use cases, specific evaluations may be more relevant for certain use cases.

Artificial Analysis Intelligence Index v4.0 includes: GDPval-AA, 𝜏²-Bench Telecom, Terminal-Bench Hard, SciCode, AA-LCR, AA-Omniscience, IFBench, Humanity's Last Exam, GPQA Diamond, CritPt. See Intelligence Index methodology for further details, including a breakdown of each evaluation and how we run them.

Openness

Artificial Analysis Openness Index: Results

Openness Index assesses model openness on a 0 to 100 normalized scale (higher is more open)
Reasoning models are indicated by a lightbulb icon

Intelligence Index Comparisons

Intelligence vs. Price

Blended at 7:2:1 (Cache Hit : Input : Output) · Price: USD per 1M tokens
Most attractive quadrant
Alibaba
Anthropic
DeepSeek
Google
InclusionAI
Kimi
KwaiKAT
NVIDIA
OpenAI
xAI
Xiaomi
Z AI
Reasoning models are indicated by a lightbulb icon.

While higher intelligence models are typically more expensive, they do not all follow the same price-quality curve.

Artificial Analysis Intelligence Index v4.0 includes: GDPval-AA, 𝜏²-Bench Telecom, Terminal-Bench Hard, SciCode, AA-LCR, AA-Omniscience, IFBench, Humanity's Last Exam, GPQA Diamond, CritPt. See Intelligence Index methodology for further details, including a breakdown of each evaluation and how we run them.

Price per token, represented as USD per million Tokens. Price is a blend of cache hit, input, and output token prices using the selected ratio.

The blended bar shown here uses cache hit price only. Other caching costs differ by provider:

  • Anthropic: charges a separate cache write fee, with different rates for 5-minute and 1-hour TTLs (1-hour TTL is more expensive). Blended price charts use Anthropic cache write price for the input leg.
  • Google (Vertex/Gemini): charges a per-hour cache storage fee in addition to cache hit pricing. Some providers also use tiered pricing for prompts above 200K tokens.
  • OpenAI, DeepSeek, others: typically charge only cache hit pricing with no write or storage fee.

See Prompt Caching for the full breakdown.

Figures represent performance of the model's first-party API (e.g. OpenAI for o1) or the median across providers where a first-party API is not available (e.g. Meta's Llama models).

Intelligence Index Token Use & Cost

Output Tokens Used to Run Artificial Analysis Intelligence Index

Tokens used to run all evaluations in the Artificial Analysis Intelligence Index
Reasoning models are indicated by a lightbulb icon

The number of tokens required to run all evaluations in the Artificial Analysis Intelligence Index (excluding repeats).

Cost to Run Artificial Analysis Intelligence Index

Cost (USD) to run all evaluations in the Artificial Analysis Intelligence Index
Reasoning models are indicated by a lightbulb icon

The cost to run the evaluations in the Artificial Analysis Intelligence Index, calculated using the model's input and output token pricing and the number of tokens used across evaluations (excluding repeats).

Context Window

Context Window

Context window: tokens limit · Higher is better
Reasoning models are indicated by a lightbulb icon

Larger context windows are relevant to RAG (Retrieval Augmented Generation) LLM workflows which typically involve reasoning and information retrieval of large amounts of data.

Maximum number of combined input & output tokens. Output tokens commonly have a significantly lower limit (varied by model).

Pricing

Pricing now includes a “Cache Hit Price” alongside Input and Output pricing, with new blend ratios.

Pricing: Cache Hit, Input, and Output

Price: USD per 1M tokens
Reasoning models are indicated by a lightbulb icon

Price per token for cached prompts (previously processed), typically offering a significant discount compared to regular input price, represented as USD per million tokens. The values shown here are the cache hit price; cache write and cache storage are billed separately and vary by provider — see "Cache pricing by provider" for detail.

Price per token included in the request/message sent to the API, represented as USD per million Tokens.

The blended bar shown here uses cache hit price only. Other caching costs differ by provider:

  • Anthropic: charges a separate cache write fee, with different rates for 5-minute and 1-hour TTLs (1-hour TTL is more expensive). Blended price charts use Anthropic cache write price for the input leg.
  • Google (Vertex/Gemini): charges a per-hour cache storage fee in addition to cache hit pricing. Some providers also use tiered pricing for prompts above 200K tokens.
  • OpenAI, DeepSeek, others: typically charge only cache hit pricing with no write or storage fee.

See Prompt Caching for the full breakdown.

Price per token generated by the model (received from the API), represented as USD per million Tokens.

Figures represent performance of the model's first-party API (e.g. OpenAI for o1) or the median across providers where a first-party API is not available (e.g. Meta's Llama models).

Speed

Measured by Output Speed (tokens per second)

Output Speed

Output tokens per second · Higher is better
Reasoning models are indicated by a lightbulb icon

Tokens per second received while the model is generating tokens (ie. after first chunk has been received from the API for models which support streaming).

Figures represent performance of the model's first-party API (e.g. OpenAI for o1) or the median across providers where a first-party API is not available (e.g. Meta's Llama models).

Output Speed vs. Price

Output speed: output tokens per second · Price: USD per 1M tokens
Most attractive quadrant
Alibaba
Anthropic
DeepSeek
Google
InclusionAI
Kimi
KwaiKAT
NVIDIA
OpenAI
xAI
Xiaomi
Z AI
Reasoning models are indicated by a lightbulb icon.

Tokens per second received while the model is generating tokens (ie. after first chunk has been received from the API for models which support streaming).

Price per token, represented as USD per million Tokens. Price is a blend of cache hit, input, and output token prices using the selected ratio.

Latency

Measured by Time (seconds) to First Token

Latency: Time To First Answer Token

Seconds to first answer token received · Accounts for reasoning model 'thinking' time
Reasoning models are indicated by a lightbulb icon

Time to first answer token received, in seconds, after API request sent. For reasoning models, this includes the 'thinking' time of the model before providing an answer. For models which do not support streaming, this represents time to receive the completion.

End-to-End Response Time

Seconds to output 500 tokens, calculated based on time to first token, 'thinking' time for reasoning models, and output speed

End-to-End Response Time

Seconds to output 500 tokens, including reasoning model 'thinking' time · Lower is better
Reasoning models are indicated by a lightbulb icon

Seconds to receive a 500 token response. Key components:

  • Input time: Time to receive the first response token
  • Thinking time (only for reasoning models): Time reasoning models spend outputting tokens to reason prior to providing an answer. Amount of tokens based on the average reasoning tokens across a diverse set of 60 prompts (methodology details).
  • Answer time: Time to generate 500 output tokens, based on output speed

Figures represent performance of the model's first-party API (e.g. OpenAI for o1) or the median across providers where a first-party API is not available (e.g. Meta's Llama models).

Model Size (Open Weights Models Only)

Model Size: Total and Active Parameters

Comparison between total model parameters and parameters active during inference
Active Parameters
Passive Parameters
Reasoning models are indicated by a lightbulb icon.

The total number of trainable weights and biases in the model, expressed in billions. These parameters are learned during training and determine the model's ability to process and generate responses.

The number of parameters actually executed during each inference forward pass, expressed in billions. For Mixture of Experts (MoE) models, a routing mechanism selects a subset of experts per token, resulting in fewer active than total parameters. Dense models use all parameters, so active equals total.

Frequently Asked Questions

Common questions about Grok 4.1 Fast (Non-reasoning)

Grok 4.1 Fast (Non-reasoning) was released on November 19, 2025.

Grok 4.1 Fast (Non-reasoning) was created by xAI.

Grok 4.1 Fast (Non-reasoning) scores 24 on the Artificial Analysis Intelligence Index, placing it well above average among other non-reasoning models in a similar price tier (median: 16).

Grok 4.1 Fast (Non-reasoning) generates output at 92.1 tokens per second (based on xAI's API), which is below average compared to other non-reasoning models in a similar price tier (median: 96.5 t/s).

Grok 4.1 Fast (Non-reasoning) has a time to first token (TTFT) of 0.65s (based on xAI's API), which is very competitive compared to other non-reasoning models in a similar price tier (median: 1.56s).

Grok 4.1 Fast (Non-reasoning) costs $0.20 per 1M input tokens (better than average, median: $0.24) and $0.50 per 1M output tokens (better than average, median: $0.71), based on xAI's API.

Grok 4.1 Fast (Non-reasoning) costs $0.20 per 1M input tokens and $0.50 per 1M output tokens (based on xAI's API). For a blended rate (3:1 input to output ratio), this is $0.28 per 1M tokens. Pricing may vary by provider. Compare provider pricing

When evaluated on the Intelligence Index, Grok 4.1 Fast (Non-reasoning) generated 4.4M output tokens, which is very competitive compared to other non-reasoning models in a similar price tier (median: 8.4M).

No, Grok 4.1 Fast (Non-reasoning) is not a reasoning model. It provides direct responses without extended chain-of-thought reasoning.

Grok 4.1 Fast (Non-reasoning) supports text and image input.

Grok 4.1 Fast (Non-reasoning) supports text output.

Yes, Grok 4.1 Fast (Non-reasoning) supports image input and can analyze, describe, and answer questions about images.

Yes, Grok 4.1 Fast (Non-reasoning) is multimodal. It can process text and image input and generate text output.

Grok 4.1 Fast (Non-reasoning) has a context window of 2.0M tokens. This determines how much text and conversation history the model can process in a single request.

No, Grok 4.1 Fast (Non-reasoning) is proprietary. The model weights are not publicly available.

Grok 4.1 Fast (Non-reasoning) is a proprietary model and xAI has not disclosed the model size or parameter count.

Grok 4.1 Fast (Non-reasoning) achieves a score of 24 on the Artificial Analysis Intelligence Index. This composite benchmark evaluates models across reasoning, knowledge, mathematics, and coding.

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