Grok 4.3
x-ai/grok-4.3Grok 4.3 is an xAI reasoning model that xAI describes as fast and reliable, with strong tool calling and instruction following. It accepts text and image input with text output, offers a 1M-token context window, and supports configurable reasoning effort that can be switched off or raised, defaulting to low. It suits agentic workflows, long-document analysis and high-volume instruction-following tasks, while Grok 4.5 through 4.7 later took over as xAI's flagship for coding.
- Input price
- $1.25USD / 1M tokens
- Output price
- $2.50USD / 1M tokens
- Cache read
- $0.20USD / 1M tokens
- Context window
- 1M
- Max output
- 1M
Specifications
- Input
- Text, image
- Output
- Text
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OpenAI-compatible endpoint with unified authentication and usage tracking.
# The quoted heredoc keeps Unicode and shell metacharacters unchanged.
result=$(curl --fail-with-body --silent \
-X POST "https://api.sandbase.ai/v1/chat/completions" \
-H "Authorization: Bearer $SANDBASE_API_KEY" \
-H "Content-Type: application/json" \
--data-binary @- <<'SANDBASE_JSON'
{
"model": "x-ai/grok-4.3",
"messages": [
{
"role": "user",
"content": "Hello"
}
],
"max_tokens": 2048
}
SANDBASE_JSON
)
printf '%s\n' "$result"Questions
FAQ
How do I call xAI Grok 4.3 through SandBase?
Create a SandBase API key, then send requests with the model ID "x-ai/grok-4.3" to Chat Completions API (/v1/chat/completions) at https://api.sandbase.ai. The request examples on this page show the exact payload.
How much does xAI Grok 4.3 cost?
$1.25 per 1M input tokens and $2.50 per 1M output tokens, billed per request from your SandBase balance. Discounts, when available, are shown in the pricing on this page.
What is the context window of xAI Grok 4.3?
1M tokens of context, with up to 1M output tokens per response.
Which features does xAI Grok 4.3 support?
xAI Grok 4.3 supports vision (image input), reasoning, function calling, structured output. See Specifications above for the full list.
Do I need a separate xAI account?
No. One SandBase API key and balance gives you access to xAI Grok 4.3 and the other models in the catalog; you do not need to sign up with xAI separately.