Tasks and inputs
Grok 4 1 Fast Reasoning is listed for Image-text-to-text, Text generation. It accepts text, image and produces text. Use the publisher’s input format and preprocessing for your chosen deployment.
SyncDev model directory · Profile updated Oct 13, 2026
A frontier multimodal model optimized specifically for high-performance agentic tool calling.
The specification score summarizes recorded features and limits. It is not a benchmark result.
Recorded modality support shows what this model can accept and produce. An undocumented modality is shown as unknown rather than assumed to be unsupported.
Accepts
Produces
Grok 4 1 Fast Reasoning is listed in Requesty’s public model catalogue under the exact routing identifier xai/grok-4-1-fast-reasoning. A frontier multimodal model optimized specifically for high-performance agentic tool calling.
When the catalogue snapshot was collected, the catalogue records a context window of 2,000,000 tokens and no verified maximum output limit. It records no reasoning-support flag, vision input support, tool-calling support, and no image-generation flag. These fields describe the routing catalogue entry and should be rechecked against the current provider documentation before production use.
The source catalogue reports input and output prices when available. Pricing can depend on the route, region, token tier, cache use, account, and date, so this record does not infer a commercial commitment from a single snapshot. Confirm current pricing, data handling, regional controls, rate limits, and availability with the current upstream documentation.
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Grok 4 1 Fast Reasoning is listed for Image-text-to-text, Text generation. It accepts text, image and produces text. Use the publisher’s input format and preprocessing for your chosen deployment.
Documented limits: 2M context and 30K maximum output. The listed route charges $0.20 input and $0.50 output per million tokens. Measure a completed task using the prompts, documents and tools your application will use. Include reasoning and retries in the result.
Use the model identifier and account requirements for the selected API route. Confirm its request limits and output format with one complete task before connecting a larger workflow.
These records share a directory category. Check the source card, output type and deployment requirements before treating a model as a replacement.
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