Gemini 3.1 Pro Preview
google/gemini-3.1-pro-previewGemini 3.1 Pro Preview is the Pro-tier reasoning model of Google's Gemini 3 series, released in February 2026 to refine Gemini 3 Pro with better thinking, improved token efficiency and more grounded, factually consistent answers. Google optimizes it for software engineering and for agentic workflows that need precise tool use and reliable multi-step execution across real-world domains. It accepts text, image, video, audio and PDF input, remains a preview model, and is Google's recommended replacement for the retired Gemini 3 Pro Preview.
- Input price
- $1.70
$2.00USD / 1M tokens - Output price
- $10.20
$12.00USD / 1M tokens - Cache read
- $0.17
$0.20USD / 1M tokens - Context window
- 1M
- Max output
- 65.5K
Specifications
- Input
- Text, image, audio
- Output
- Text
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OpenAI-compatible endpoint with unified authentication and usage tracking.
# The quoted heredoc keeps Unicode and shell metacharacters unchanged.
result=$(curl --fail-with-body --silent \
-X POST "https://api.sandbase.ai/v1/chat/completions" \
-H "Authorization: Bearer $SANDBASE_API_KEY" \
-H "Content-Type: application/json" \
--data-binary @- <<'SANDBASE_JSON'
{
"model": "google/gemini-3.1-pro-preview",
"messages": [
{
"role": "user",
"content": "Hello"
}
],
"max_tokens": 2048
}
SANDBASE_JSON
)
printf '%s\n' "$result"Questions
FAQ
How do I call Google Gemini 3.1 Pro Preview through SandBase?
Create a SandBase API key, then send requests with the model ID "google/gemini-3.1-pro-preview" 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 Google Gemini 3.1 Pro Preview cost?
$1.70 per 1M input tokens and $10.20 per 1M output tokens with the current 15% discount (list price $2 / $12), billed per request from your SandBase balance.
What is the context window of Google Gemini 3.1 Pro Preview?
1M tokens of context, with up to 65.5K output tokens per response.
Which features does Google Gemini 3.1 Pro Preview support?
Google Gemini 3.1 Pro Preview supports vision (image input), reasoning, function calling, structured output. See Specifications above for the full list.
Do I need a separate Google account?
No. One SandBase API key and balance gives you access to Google Gemini 3.1 Pro Preview and the other models in the catalog; you do not need to sign up with Google separately.