Grok 4.20 Reasoning is the reasoning-enabled production model of xAI's March 2026 Grok 4.20 generation, generating explicit chain-of-thought before responding to improve accuracy on complex logic, math, and multi-step problems. It spans a 2 million token context window, making it strong for long-horizon agentic workflows and research. The model integrates real-time X data when context is needed, supports native tool calling for external API invocation, and handles image input alongside text. Visible reasoning steps support transparency and debugging across multi-turn conversations. Released in March 2026, Grok 4.20 Reasoning targets accuracy-critical applications such as analysis, complex code generation, and structured reasoning where you need both explanations and the long context that extended tasks demand.
Grok 4.20 Reasoning runs on 3 different routes through the Opper gateway. Compare residency, ZDR, and training posture at a glance — full data-handling detail per route below.
| Provider | Region | Zero data retention | Training | Input | Output |
|---|---|---|---|---|---|
| Google Cloud | Multi | Enterprise | No | $2.00 | $6.00 |
| xAI | US | Enterprise | No | $2.00 | $6.00 |
| xAI | EU | Enterprise | No | $2.00 | $6.00 |
Training posture across routes: No training on prompts by default.
Each route hosting Grok 4.20 Reasoning has its own privacy posture, residency, and GDPR terms. Postures are maintained by Opper with a last-verification timestamp.
Zero data retention is available via Opper Enterprise contract. No training on customer data. US; SCCs; DPA available.
Zero data retention is available via Opper Enterprise contract. No training on customer data. US; SCCs; DPA available.
Zero data retention is available via Opper Enterprise contract. No training on customer data. EU; DPA available.
Call Grok 4.20 Reasoning through the Opper gateway with one API key. Let your coding agent set it up, or call it directly — Opper is drop-in compatible with the OpenAI, Anthropic, and Google AI SDKs.
Copy this and paste it into your coding agent — Claude Code, Cursor, Codex, and more — and it'll wire up Opper for you.
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-4.20-reasoning",messages: [{ role: "user", content: "Hello" }],});console.log(completion.choices[0].message.content);
Side-by-side on privacy, EU hosting, pricing, and benchmarks.
