Grok 3 Mini

by xAI

Grok 3 Mini is a smaller thinking model that verbalizes its reasoning before responding, making its internal thought process inspectable. It exposes reasoning tokens so you can follow how it arrived at an answer, which helps with debugging and trust in agentic workflows. It is suited to logic-based tasks, math, and structured problem solving where deep domain knowledge is not required. The model supports adjustable reasoning effort with low and high settings, structured outputs, and tool calling, making it a fit for applications that balance cost and reasoning quality on lighter workloads. With a 131k token context window and a May 2025 release, Grok 3 Mini offers a fast, compact alternative to larger reasoning models while keeping the transparent thinking that characterizes xAI's reasoning approach.

Key info

Input
Output
Features
Context window
131K
Max output
16K
Input price
$0.30 /1M
Output price
$0.50 /1M
  • US residency available
  • Zero data retention via Enterprise
  • No training by default
  • GDPR DPA available

Available routes

Grok 3 Mini runs on 1 route through the Opper gateway. Compare residency, ZDR, and training posture at a glance β€” full data-handling detail per route below.

ProviderRegionZero data retentionTrainingInputOutput
xAIUSEnterpriseNo$0.30$0.50

Training posture across routes: No training on prompts by default.

Data handling per route

Each route hosting Grok 3 Mini has its own privacy posture, residency, and GDPR terms. Postures are maintained by Opper with a last-verification timestamp.

xAI β€” United StatesπŸ‡ΊπŸ‡Έ

Zero data retention is available via Opper Enterprise contract. No training on customer data. US; SCCs; DPA available.

Zero data retention
Available via Opper Enterprise contract.
Training
No training on customer data.
Logging
Abuse monitoring (30-day retention)
Third-party access
None disclosed
GDPR DPA
DPA available
Transfer mechanism
SCCs

Benchmarks

Independent benchmark scores β€” composite indices for reasoning, coding, and math, plus individual eval scores where available.

Global rank#164 of 531 LLMs
TierEfficient
Output speed69 tok/s
First token0.55s
Intelligence Index22.5
Coding Index25.2
Math Index84.7
Reasoning & knowledge
MMLU-Pro
83%
GPQA Diamond
79%
Humanity's Last Exam
11%
Long-context reasoning
50%
Coding
LiveCodeBench
70%
SciCode
41%
Agentic & tool use
Terminal-Bench Hard
17%
τ²-Bench Telecom
90%
Math & instruction following
AIME 2025
85%
IFBench
46%

Get started

Call Grok 3 Mini through the Opper gateway with one API key. Let your coding agent set it up, or call it directly β€” Opper is drop-in compatible with the OpenAI, Anthropic, and Google AI SDKs.

Set it up with your agent

Copy this and paste it into your coding agent β€” Claude Code, Cursor, Codex, and more β€” and it'll wire up Opper for you.

Or call it directly

import OpenAI from "openai";
const client = new OpenAI({
apiKey: process.env.OPPER_API_KEY,
baseURL: "https://api.opper.ai/v3/compat",
});
const completion = await client.chat.completions.create({
model: "xai/grok-3-mini",
messages: [{ role: "user", content: "Hello" }],
});
console.log(completion.choices[0].message.content);

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Side-by-side on privacy, EU hosting, pricing, and benchmarks.

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Grok 3 Mini by xAI β€” pricing, benchmarks | Opper AI