Available now
xAI
grok-4.20-0309-reasoning
Grok 4.20 is a reasoning model from xAI with industry-leading speed and agentic tool calling capabilities. It combines the lowest hallucination rate on the market with strict prompt adherance, delivering...
TextReasoningToolsFilesVision1MCacheWebSearch
Input$2.10/ 1M
Output$4.20/ 1M
Endpointsopenai, anthropic
Capabilities
ReasoningToolsVisionFilesCacheStructuredWeb search
Modalities
Input
textimagefile
Output
text
Quick stats
Context window1M
Max output2M
Modechat
TokenizerGrok
Knowledge cutoff2025
Performance
Loading performance data...
Supported parameters
| Parameter | Always | Default |
|---|---|---|
| frequency_penalty | - | (do not send) |
| include_reasoning | - | |
| logprobs | - | |
| max_tokens | - | |
| presence_penalty | - | (do not send) |
| reasoning | - | |
| repetition_penalty | - | (do not send) |
| response_format | - | |
| seed | - | |
| structured_outputs | - | |
| temperature | (do not send) | |
| tool_choice | - | |
| tools | - | |
| top_k | - | (do not send) |
| top_logprobs | - | |
| top_p | (do not send) |
§ 01
Pricing
| Input price | $2.10 · 1M tokens |
| Output price | $4.20 · 1M tokens |
| Compatible endpoints | openai, anthropic |
| Vendor | xAI |
§ 02
Call grok-4.20-0309-reasoning from your code
Point any OpenAI-compatible SDK at UnoRouter and request the model by name. Replace YOUR_API_KEY with a real key from your dashboard.
bash
curl https://api.unorouter.com/v1/chat/completions \
-H "Authorization: Bearer YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "grok-4.20-0309-reasoning",
"messages": [{"role": "user", "content": "Hello!"}]
}'§ 03
Frequently asked questions
How much does grok-4.20-0309-reasoning cost per 1M tokens?
Input is priced at $2.10 per 1M tokens, output at $4.20 per 1M tokens. Billing is per token, no rounding to batch sizes.
How do I access grok-4.20-0309-reasoning via API?
Send requests to the UnoRouter /v1/chat/completions endpoint with model=grok-4.20-0309-reasoning. Any OpenAI-compatible client library works. Authentication uses a standard Bearer token.
§ 04
Similar models
Try grok-4.20-0309-reasoning now
Create an API key and start making requests in under a minute.