xAI
Grok 3 Fast Beta
Grok 3 Fast Beta is a large language model by xAI with support for function calling and web search. It supports a 131K token context window with up to 131K tokens of output. Priced at $3 per million input tokens and $15 per million output tokens. Access Grok 3 Fast Beta through Inworld Router with OpenAI SDK compatibility, built-in failover, and intelligent routing across providers.
→Function CallingWeb Search
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-3-fast-beta-a",
"model_id": "xai/grok-3-fast-beta"
},
"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 3 Fast Beta pricing and providers
Access Grok 3 Fast Beta 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 | 131.1K | 131.1K | $3.00 | $15.00 |
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