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 |
|---|---|---|---|---|---|
| Multi | Not by default | No | $2.00 | $6.00 | |
| US | Not by default | No | $2.00 | $6.00 | |
| EU | Not by default | No | $2.00 | $6.00 |
Grok 4.20 Reasoning runs on 2 independently monitored routes through the Opper gateway. A direct integration leaves you on one of them, the gateway serves whichever is healthy.
Measured over the last 30 days from each provider's official status feed via StatusGator. Refreshed hourly. See uptime for every provider Opper monitors.
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 not on by default — abuse monitoring. No training on customer data. GLOBAL; SCCs; DPA available.
Zero data retention is not on by default — abuse monitoring, 30-day retention. No training on customer data. US; SCCs; DPA available.
Zero data retention is not on by default — abuse monitoring, 30-day retention. 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 a coding agent like Claude Code, Cursor or Codex 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.
