xAI
Grok 4.1 Fast Reasoning Latest
Grok 4.1 Fast Reasoning Latest is a reasoning model by xAI with vision, function calling, web search, structured output — designed for complex, multi-step problem solving where accuracy matters more than speed. It supports a 2M token context window with up to 2M tokens of output. Priced at $0.2 per million input tokens and $0.5 per million output tokens, it is one of the most cost-efficient options in its class. Access Grok 4.1 Fast Reasoning Latest through Inworld Router with OpenAI SDK compatibility, built-in failover, and intelligent routing across providers.
→Function CallingWeb SearchReasoningResponse SchemaVision
Step 1 — Create Router
curl --location 'https://api.inworld.ai/router/v1/routers' \
--header 'Authorization: Basic <your-api-key>' \
--header 'Content-Type: application/json' \
--data '{
"name": "compare-frontier-models",
"defaultRoute": {
"route_id": "default",
"variants": [
{
"variant": {
"variant_id": "xai/grok-4-1-fast-reasoning-latest-a",
"model_id": "xai/grok-4-1-fast-reasoning-latest"
},
"weight": 33
},
{
"variant": {
"variant_id": "xai/grok-3-b",
"model_id": "xai/grok-3"
},
"weight": 33
},
{
"variant": {
"variant_id": "xai/grok-3-beta-c",
"model_id": "xai/grok-3-beta"
},
"weight": 34
}
]
}
}'Step 2 — Chat Completion
curl --location 'https://api.inworld.ai/v1/chat/completions' \
--header 'Authorization: Basic <your-api-key>' \
--header 'Content-Type: application/json' \
--data '{
"model": "inworld/compare-frontier-models",
"messages": [{"role": "user", "content": "Hello!"}]
}'Grok 4.1 Fast Reasoning Latest pricing and providers
Access Grok 4.1 Fast Reasoning Latest through xAI via Inworld Router or Realtime API.
| Capabilities | Input modalities | Output modalities | |||||
|---|---|---|---|---|---|---|---|
| xAI | 2M | 2M | $0.20 | $0.50 | +2 |
Other xAI models available through Inworld
Compare Grok 4.1 Fast Reasoning Latest with other xAI models available through Inworld Router or Realtime API.
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