Grok 4.20 Beta is xAI's current flagship AI model, released March 2026. It uses a MoE architecture estimated at 1.7-3 trillion parameters and runs four specialized AI agents in parallel on complex queries.

When will Grok 5 be released?

Grok 5 is currently in training on xAI's Colossus 2 supercluster. The cluster is expanding to 1.5GW by April 2026. Polymarket gives it a mid-2026 release window, with most bets pointing to Q2-Q3 2026.

Grok 5 is estimated at approximately 6 trillion parameters in a Mixture-of-Experts architecture, making it one of the largest AI models ever trained. It's training on xAI's Colossus 2 cluster.

Quick Answer

Grok 4.20 vs Grok 5: What We Know (April 2026)

Published: April 2, 2026

Grok 4.20 vs Grok 5: What We Know (April 2026)

xAI’s Grok 4.20 is the current flagship while Grok 5 trains on what may be the world’s largest AI supercluster. Here’s how they compare and when to expect Grok 5.

Last verified: April 2026

Current: Grok 4.20 Beta

Detail	Info
Released	March 10, 2026
Parameters	~1.7-3T (MoE estimate)
Architecture	Mixture of Experts
Key feature	4 parallel specialist agents
Access	X Premium+, xAI API
API variant	Grok 4.1 Fast also available

What Makes Grok 4.20 Different

Grok 4.20 is “the most architecturally different model in the market” according to analysts. Instead of a single inference pass, it runs four specialized AI agents in parallel on complex queries:

Research agent — Gathers real-time web data from X/Twitter
Reasoning agent — Handles logical analysis
Creative agent — Generates novel content
Verification agent — Fact-checks the other agents’ outputs

This multi-agent approach means Grok 4.20 responses can be more thorough on complex questions, though they may take longer.

Real-Time X Integration

Grok’s unique advantage: direct access to X/Twitter’s firehose of posts. For trending news, real-time events, and public opinion analysis, no other model has this built-in.

Coming: Grok 5

Detail	Expected
Parameters	~6 trillion (MoE)
Training cluster	Colossus 2 (1.5GW by April 2026)
Expected release	Q2-Q3 2026
Polymarket odds	By June 30, 2026

What We Know

Training on Colossus 2, xAI’s Memphis supercluster upgraded to 1.5GW
Estimated 6 trillion parameters — 2-3x larger than Grok 4.20
Primary training run is reportedly complete; fine-tuning underway
Musk has teased capabilities in investor presentations

Expected Improvements

Based on xAI’s trajectory and Musk’s comments:

Significantly improved reasoning (targeting GPT-5.4 Thinking-level performance)
Better code generation
Improved safety while maintaining “less censored” positioning
Deeper integration with X, Tesla, and xAI’s broader ecosystem

Grok 4.20 vs Competition

Benchmark	Grok 4.20	GPT-5.4	Claude Opus 4.6	Gemini 3.1 Pro
Real-time data	✅ Best (X firehose)	Good	Limited	Good
Coding	Good	Strong	Best	Strong
Reasoning	Strong	Best	Strong	Strong
Multimodal	Good	Good	Limited	Best
Price (API)	Mid	High	High	Low

Should You Wait for Grok 5?

If you need Grok now: Grok 4.20 is a strong model, especially for real-time analysis
If comparing models: GPT-5.4 or Claude Opus 4.6 are better for coding; Gemini 3.1 Pro for multimodal
If you’re an xAI fan: Grok 5 is likely 2-4 months away, worth waiting for big projects

Last verified: April 2026