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, prompt caching, 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 $1.25 per million input tokens and $2.5 per million output tokens. Access Grok 4.1 Fast Reasoning Latest through Inworld Router with OpenAI SDK compatibility, built-in failover, and intelligent routing across providers.
→Function CallingWeb SearchReasoningPrompt CachingResponse SchemaVisionreasoningCapability
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-mini-fast-b",
"model_id": "xai/grok-3-mini-fast"
},
"weight": 33
},
{
"variant": {
"variant_id": "xai/grok-3-mini-fast-beta-c",
"model_id": "xai/grok-3-mini-fast-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. By using the AI provider(s) below you acknowledge you reviewed and agree to their terms listed in the Legal section under the AI provider's name.
| Capabilities | Input modalities | Output modalities | |||||
|---|---|---|---|---|---|---|---|
| xAI | 2M | 2M | $1.25 | $2.50 | +4 |
Other xAI models available through Inworld
Compare Grok 4.1 Fast Reasoning Latest with other xAI models available through Inworld Router or Realtime API.
| Capabilities | Input modalities | Output modalities | Inference provider | |||||
|---|---|---|---|---|---|---|---|---|
| Grok 3 Mini Fast | 131.1K | 131.1K | $1.25 | $2.50 | +2 | |||
| Grok 3 Mini Fast Beta | 131.1K | 131.1K | $1.25 | $2.50 | +2 | |||
| Grok 3 Mini Fast Latest | 131.1K | 131.1K | $1.25 | $2.50 | +2 | |||
| Grok 4 | 256K | 256K | $1.25 | $2.50 | ||||
| Grok 4 Fast | — | — | $1.25 | $2.50 | — | |||
| Grok 4 Fast Non Reasoning Latest | — | — | $1.25 | $2.50 | — | |||
| Grok 4.1 Fast | 2M | 2M | $1.25 | $2.50 | +4 | |||
| Grok 4.1 Fast Non Reasoning Latest | 2M | 2M | $1.25 | $2.50 | +2 | |||
| Grok 4.20 | — | — | $1.25 | $2.50 | — | |||
| Grok 4.20 Beta Latest | — | — | $1.25 | $2.50 | — | |||
| Grok 4.20 Beta Latest Non Reasoning | — | — | $1.25 | $2.50 | — | |||
| Grok 4.20 Beta Latest Reasoning | — | — | $1.25 | $2.50 | — | |||
| Grok 4.20 Beta Non Reasoning | — | — | $1.25 | $2.50 | — | |||
| Grok 4.20 Experimental Beta Latest | — | — | $1.25 | $2.50 | — | |||
| Grok 4.20 Experimental Beta Non Reasoning Latest | — | — | $1.25 | $2.50 | — | |||
| Grok 4.20 Non Reasoning | — | — | $1.25 | $2.50 | — | |||
| Grok 4.20 Non Reasoning Latest | — | — | $1.25 | $2.50 | — | |||
| Grok 4.20 Reasoning Gv2 | — | — | $1.25 | $2.50 | — | |||
| Grok Code Fast 1 0825 | 256K | 256K | $1.00 | $2.00 | +1 |
Start building with Grok 4.1 Fast Reasoning Latest
Access Grok 4.1 Fast Reasoning Latest and every other model through Inworld Router or Realtime API. Create your free account and start routing in minutes.