Grok-4.20 Beta Reasoning (Reasoning)

by xAI

Grok-4.20 Beta Reasoning (Reasoning) is a reasoning model from xAI, released on March 9, 2026. It has a 2M-token context window and can generate up to 30K output tokens. API pricing is $2 per 1M input tokens and $6 per 1M output tokens. It ranks #110 of 220 models by Intelligence Score with a score of 23.5.

Grok 4.20 Beta Reasoning is xAI's reasoning-optimized variant of the Grok 4.20 model family. Released as a beta on March 9, 2026, it uses thinking tokens for enhanced chain-of-thought reasoning, featuring a 2 million token context window for complex problem-solving tasks.

Key specs

ProviderxAI
Release date2026-03-09
Licenseproprietary
Context window2M tokens
Max output30K tokens
Input price$2 / 1M tokens
Output price$6 / 1M tokens
Intelligence Score23.5

Quick answers

What is the context window of Grok-4.20 Beta Reasoning (Reasoning)?

Grok-4.20 Beta Reasoning (Reasoning) has a context window of 2M tokens, with a maximum output of 30K tokens per response.

How much does Grok-4.20 Beta Reasoning (Reasoning) cost?

Grok-4.20 Beta Reasoning (Reasoning) costs $2 per 1M input tokens and $6 per 1M output tokens through the API.

Is Grok-4.20 Beta Reasoning (Reasoning) open source?

No. Grok-4.20 Beta Reasoning (Reasoning) is a proprietary model from xAI (proprietary license).

When was Grok-4.20 Beta Reasoning (Reasoning) released?

xAI released Grok-4.20 Beta Reasoning (Reasoning) on March 9, 2026.

How does Grok-4.20 Beta Reasoning (Reasoning) compare to Claude Opus 5.5 (Reasoning)?

Grok-4.20 Beta Reasoning (Reasoning) scores 23.5 on the Intelligence Score versus 60.5 for Claude Opus 5.5 (Reasoning), the current #1. Input pricing is $2 vs $4 per 1M tokens.

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