Grok 4.20
Grok 4.20 is a text generation model from X.ai featuring a 2,000,000 token context window for long-document tasks.
X.aiLarge context text generation from X.ai
Grok 4.20 is a large language model developed by X.ai, released in March 2026 under the full model identifier grok-4.20-beta-non-reasoning. It is a chat-oriented text generation model available as a first-party provider on MindStudio, designed to handle conversational and document-based tasks. Its most notable technical characteristic is a 2,000,000 token context window, which allows it to process and respond to very long inputs within a single session.
The non-reasoning designation in the model's full name indicates that Grok 4.20 operates without an explicit chain-of-thought or extended reasoning mode, making it suited for tasks where direct text generation is preferred over step-by-step deliberation. This makes it a practical choice for summarization, drafting, question answering, and other workflows that involve large volumes of text. Developers working with lengthy documents, codebases, or multi-turn conversations will find the large context capacity particularly relevant.
What Grok 4.20 supports
Long Context Processing
Handles inputs and outputs up to 2,000,000 tokens within a single session, enabling analysis of very large documents or extended conversations.
Text Generation
Generates coherent natural language responses for tasks such as drafting, summarization, and question answering in a chat format.
Direct Response Mode
Operates without an extended chain-of-thought reasoning step, producing responses directly rather than through explicit multi-step deliberation.
Multi-turn Conversation
Supports chat-style interactions across multiple turns, retaining context across the full 2,000,000 token window.
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Get Started FreeBenchmark scores
Scores represent accuracy — the percentage of questions answered correctly on each test.
| Benchmark | What it tests | Score |
|---|---|---|
| GPQA Diamond | PhD-level science questions (biology, physics, chemistry) | 88.5% |
| HLE | Questions that challenge frontier models across many domains | 30.0% |
| SciCode | Scientific research coding and numerical methods | 44.7% |
Common questions about Grok 4.20
What is the context window size for Grok 4.20?
Grok 4.20 has a context window of 2,000,000 tokens, which also matches its maximum response size.
What does 'non-reasoning' mean in the model's name?
The full model identifier is grok-4.20-beta-non-reasoning, indicating the model does not use an explicit chain-of-thought or extended reasoning mode. It generates responses directly without step-by-step deliberation.
Who publishes Grok 4.20?
Grok 4.20 is published by X.ai and is available on MindStudio as a first-party provider.
What is the pricing for Grok 4.20?
Pricing information for Grok 4.20 has not been published in the available metadata. Check MindStudio or X.ai directly for current pricing details.
When was Grok 4.20 released?
Grok 4.20 was released in March 2026 and was added to MindStudio on March 11, 2026.
Does Grok 4.20 support image or video inputs?
Based on the available metadata, image and video analysis support is not confirmed for Grok 4.20. The model's listed input types do not include multimodal inputs.
What people think about Grok 4.20
Community discussion around Grok 4.20 on Reddit has been generally anticipatory and positive, with threads tracking its development from pre-training completion through its eventual API release. Users in the r/singularity community noted milestones such as Elon Musk confirming pre-training completion and the subsequent beta API launch in March 2026.
Some threads drew comparisons to other models releasing around the same period, reflecting broader interest in the competitive landscape rather than specific concerns about Grok 4.20 itself. The API release thread had modest engagement, suggesting early-adopter interest primarily among developers rather than widespread general discussion.
xAI to launch Grok 4.20 by Christmas
xAI Releases Grok 4.20 Beta Models via API
GLM-5 Coming in February! It's confirmed.
Elon Musk says that Grok 4.20 has completed its pre-training
Documentation & links
Parameters & options
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