xAI
Grok 3 Mini Fast
Grok 3 Mini Fast is a reasoning model by xAI with function calling, web search, prompt caching — designed for complex, multi-step problem solving where accuracy matters more than speed. It supports a 131K token context window with up to 131K tokens of output. Priced at $1.25 per million input tokens and $2.5 per million output tokens. Access Grok 3 Mini Fast through Inworld Router with OpenAI SDK compatibility, built-in failover, and intelligent routing across providers.
→Function CallingWeb SearchReasoningPrompt CachingreasoningCapability
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-mini-fast-a",
"model_id": "xai/grok-3-mini-fast"
},
"weight": 33
},
{
"variant": {
"variant_id": "xai/grok-3-mini-fast-beta-b",
"model_id": "xai/grok-3-mini-fast-beta"
},
"weight": 33
},
{
"variant": {
"variant_id": "xai/grok-3-mini-fast-latest-c",
"model_id": "xai/grok-3-mini-fast-latest"
},
"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 Mini Fast pricing and providers
Access Grok 3 Mini Fast 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 | $1.25 | $2.50 | +2 |
Other xAI models available through Inworld
Compare Grok 3 Mini Fast with other xAI models available through Inworld Router or Realtime API.
| Capabilities | Input modalities | Output modalities | Inference provider | |||||
|---|---|---|---|---|---|---|---|---|
| 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 4.1 Fast Reasoning Latest | 2M | 2M | $1.25 | $2.50 | +4 | |||
| 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 3 Mini Fast
Access Grok 3 Mini Fast and every other model through Inworld Router or Realtime API. Create your free account and start routing in minutes.