xAI: Grok 4 Fast, xAI — route, pricing & source

Grok 4 Fast is xAI's latest multimodal model with SOTA cost-efficiency and a 2M token context window. It comes in two flavors: non-reasoning and reasoning. Read more about the model...

OpenRoutermediumLast checked: May 14, 2026
Input
$0.2000 / 1M
/ 1M tokens
Output
$0.5000 / 1M
/ 1M tokens
Cached input
Not available
Not available
Cache write
Not available
Not available

Context and limits

Context window
2M
Max output
30,000
Input modalities
text, image, file
Output modalities
text
Weight access
Closed
Availability
Unknown
Capability flags
VisionToolsJSONReasoningLong context

From source metadata + verification fields — confirm provider docs before production.

Benchmarks

Access and license

Official API
No
Open weights
No
Self-hostable
No
License
Closed · API onlyNo public weights: use through a vendor’s cloud API or product. “Proprietary” means the creator does not distribute the trained model weights for self-hosting.

Example costs

Scenario: 1K input + 300 output tokens / request

10,000 requests
$3.50
100,000 requests
$35.00
1,000,000 requests
$350.00

Cheaper alternatives

Lower-cost models for the same scenario

Mistral: Mistral Nemo
OpenRouter
$2.90
Meta: Llama 3.1 8B Instruct
OpenRouter
$3.50
IBM: Granite 4.0 Micro
OpenRouter
$5.00
Meta: Llama 3 8B Instruct
OpenRouter
$5.20
Sao10K: Llama 3 8B Lunaris
OpenRouter
$5.50

Source

Source
OpenRouter Models API
Confidence
medium
Route
OpenRouter
Last checked
May 14, 2026
Source notes
  • Includes Hugging Face benchmark data only when the dataset is public, ungated, allowlisted, and matched by reviewed aliases.
Open source
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