CO
Aya Expanse 32B
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xAI model product
Grok 4.1 Fast Reasoning
1 Fast Reasoning is an xAI language model variant optimized for faster inference while maintaining reasoning capabilities through thinking tokens.
Updated Sep 8, 2026. Default version: Grok-4.1 Fast Reasoning
LLMBoard ScoreN/ANot scored
CoverageN/ANot scored
Context window2MTokens
Official input priceN/AOfficial price unavailable
Grok 4.1 Fast Reasoning Benchmark Results
Benchmark scores for the scored version.
No benchmark results
No benchmark result is linked to the scored version.
Grok 4.1 Fast Reasoning Arena Results
Preference and agent-evaluation results for the default version.
Sort by
Arena | Category | Rank | Rating / score | Votes | Observations | Result date |
|---|
| Arenavision | Categoryentity recognition | Rank20 | Rating / score1,233.17 | Votes108 | ObservationsN/A | Result date |
| Arenavision style control | Categoryentity recognition | Rank22 | Rating / score1,199.40 | Votes108 | ObservationsN/A | Result date |
| Arenatext factuality | Categorykorean | Rank35 | Rating / score1,372.55 | Votes418 | ObservationsN/A | Result date |
| Arenatext factuality | Categorygerman | Rank37 | Rating / score1,385.95 | Votes451 | ObservationsN/A | Result date |
| Arenavision style control | Categorycreative writing vision | Rank40 | Rating / score1,227.78 | Votes822 | ObservationsN/A | Result date |
| Arenavision | Categoryhumor | Rank41 | Rating / score1,233.61 | Votes454 | ObservationsN/A | Result date |
| Arenavision style control | Categoryhumor | Rank42 | Rating / score1,223.58 | Votes454 | ObservationsN/A | Result date |
| Arenatext factuality | Categorypolish | Rank43 | Rating / score1,391.56 | Votes884 | ObservationsN/A | Result date |
| Arenavision | Categorycreative writing vision | Rank43 | Rating / score1,233.65 | Votes822 | ObservationsN/A | Result date |
| Arenavision | Categorychinese | Rank53 | Rating / score1,237.94 | Votes859 | ObservationsN/A | Result date |
| Arenavision style control | Categorychinese | Rank55 | Rating / score1,228.87 | Votes859 | ObservationsN/A | Result date |
| Arenatext factuality | Categoryfrench | Rank58 | Rating / score1,433.03 | Votes883 | ObservationsN/A | Result date |
| Arenatext factuality | Categoryspanish | Rank58 | Rating / score1,402.99 | Votes988 | ObservationsN/A | Result date |
| Arenatext style control | Categorycreative writing | Rank58 | Rating / score1,414.71 | Votes8,600 | ObservationsN/A | Result date |
| Arenavision style control | Categoryenglish | Rank58 | Rating / score1,211.21 | Votes4,959 | ObservationsN/A | Result date |
| Arenavision | Categoryenglish | Rank60 | Rating / score1,217.99 | Votes4,959 | ObservationsN/A | Result date |
| Arenavision | Categorydiagram | Rank62 | Rating / score1,207.29 | Votes3,223 | ObservationsN/A | Result date |
| Arenavision | Categoryoverall | Rank63 | Rating / score1,199.33 | Votes12,505 | ObservationsN/A | Result date |
| Arenavision style control | Categorydiagram | Rank64 | Rating / score1,214.33 | Votes3,223 | ObservationsN/A | Result date |
| Arenatext style control | Categoryspanish | Rank66 | Rating / score1,428.52 | Votes1,610 | ObservationsN/A | Result date |
| Arenavision style control | Categoryoverall | Rank66 | Rating / score1,194.62 | Votes12,505 | ObservationsN/A | Result date |
| Arenatext style control | Categorykorean | Rank67 | Rating / score1,378.33 | Votes864 | ObservationsN/A | Result date |
| Arenatext style control | Categorypolish | Rank67 | Rating / score1,423.40 | Votes1,421 | ObservationsN/A | Result date |
| Arenavision | Categoryocr | Rank67 | Rating / score1,192.27 | Votes8,680 | ObservationsN/A | Result date |
| Arenavision style control | Categoryocr | Rank68 | Rating / score1,191.72 | Votes8,680 | ObservationsN/A | Result date |
| Arenatext factuality | Categorycreative writing | Rank69 | Rating / score1,405.70 | Votes5,154 | ObservationsN/A | Result date |
| Arenavision | Categoryhomework | Rank69 | Rating / score1,172.25 | Votes1,975 | ObservationsN/A | Result date |
| Arenatext style control | Categoryindustry entertainment and sports and media | Rank70 | Rating / score1,402.84 | Votes10,727 | ObservationsN/A | Result date |
| Arenatext style control | Categorygerman | Rank71 | Rating / score1,418.50 | Votes920 | ObservationsN/A | Result date |
| Arenavision style control | Categoryhomework | Rank71 | Rating / score1,170.45 | Votes1,975 | ObservationsN/A | Result date |
Grok 4.1 Fast Reasoning Pricing
Official vendor API pricing appears first, followed by individual provider offers.
- Official API
- N/A
- Official provider
- N/A
- Lowest third-party
- From $0.18 input, $0.45 output per 1M via Jiekou.AI
- Tracked offerings
- 8
Sort by
Provider | Provider model ID | Region | Input / 1M | Output / 1M | Context | Updated |
|---|
| ProviderJiekou.AI | Provider model IDgrok-4-1-fast-reasoning | Regionglobal | Input / 1M$0.18 | Output / 1M$0.45 | Context2M | Updated |
| ProviderHelicone | Provider model IDgrok-4-1-fast-reasoning | Regionglobal | Input / 1M$0.20 | Output / 1M$0.50 | Context2M | Updated |
| Provider302.AI | Provider model IDgrok-4-1-fast-reasoning | Regionglobal | Input / 1M$0.20 | Output / 1M$0.50 | Context2M | Updated |
| ProviderAzure | Provider model IDgrok-4-1-fast-reasoning | Regionglobal | Input / 1M$0.20 | Output / 1M$0.50 | Context128K | Updated |
| ProviderFrogBot | Provider model IDgrok-4-1-fast-reasoning | Regionglobal | Input / 1M$0.20 | Output / 1M$0.50 | Context2M | Updated |
| ProviderVercel AI Gateway | Provider model IDspacexai/grok-4.1-fast-reasoning | Regionglobal | Input / 1M$0.20 | Output / 1M$0.50 | Context1M | Updated |
| ProviderDevPass (LLM Gateway) | Provider model IDgrok-4-1-fast-reasoning | Regionglobal | Input / 1M$0.20 | Output / 1M$0.50 | Context2M | Updated |
Official prices use only the vendor's configured official Provider and positive standard USD PAYG rates. Third-party offers remain explicitly labeled.
Grok 4.1 Fast Reasoning Runtime Performance
Provider-specific output speed and catalog latency for Grok-4.1 Fast Reasoning. Runtime does not affect the capability score.
Sort by
Provider | Output Speed | Catalog Latency | Max Input | Max Output | Updated |
|---|
| ProviderxAI | Output Speed7.71 tok/s | Catalog Latency1.33 s | Max Input2M | Max Output30K | Updated |
Output Speed is generated output tokens received per second. Catalog latency is reported separately from observed provider TTFT.
Grok 4.1 Fast Reasoning Specifications
Technical details for the model's default version.
- Version
- Grok-4.1 Fast Reasoning
- Released
- Nov 17, 2025
- Knowledge cutoff
- Unknown
- Parameters
- N/A
- Context window
- 2M
- Max output
- 30K
- Inputs
- image, text
- Outputs
- text
- Open weights
- No
- License
- Proprietary
Grok 4.1 Fast Reasoning Versions
Available versions of this model. The score column identifies the version used in the overall ranking.
Sort by
Version | Released | LLMBoard | Parameters | Context | Max output | Open weights | License |
|---|
| VersionGrok-4.1 Fast Reasoning | Released | LLMBoardN/A | ParametersN/A | Context2M | Max output30K | Open weightsNo | LicenseProprietary |
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What is Grok 4.1 Fast Reasoning?
Key information about Grok 4.1 Fast Reasoning and its available data.
1 Fast Reasoning is a high-speed xAI model for tool-calling agents that uses thinking tokens to support reasoning through the xAI API.
Data as of 2026-09-08.
FAQ
Common questions about Grok 4.1 Fast Reasoning.
When was Grok 4.1 Fast Reasoning released?
Grok 4.1 Fast Reasoning's default version was released on Nov 17, 2025.
How much does Grok 4.1 Fast Reasoning cost?
No official standard PAYG price is currently available for Grok 4.1 Fast Reasoning. The lowest tracked third-party offer starts at $0.18 input and $0.45 output via Jiekou.AI.
Who created Grok 4.1 Fast Reasoning?
Grok 4.1 Fast Reasoning was created by xAI.
What is the context window for Grok 4.1 Fast Reasoning?
The default version has a 2M token context window.
Is Grok 4.1 Fast Reasoning open weight?
No. The default version is not marked as having publicly available weights.