X Algorithm Open Source 2026
Elon Musk open-sources X\
What Happened?
On January 10, 2026, Elon Musk announced that X (formerly Twitter) would open-source its entire recommendation algorithm. A week later, the complete codebase was published on GitHub under the Apache 2.0 license. This includes all code used to determine what organic posts and advertisements appear in your
"We will make the new X algorithm, including all code used to determine what organic and advertising posts are recommended to users, open source in 7 days. This will be repeated every 4 weeks, with comprehensive developer notes."
— Elon Musk, January 10, 2026
Timeline
January 10, 2026
Elon Musk announces algorithm will go open source in 7 days
January 17, 2026
Full algorithm code released on GitHub (xai-org/x-algorithm)
Every 4 Weeks
Promised updates with comprehensive developer notes
Technology Stack
Languages
Details
- Apache 2.0 License
- Based on xAI\
- 20,000 GPUs at Colossus Data Center
- Monthly Updates Promised
How the Algorithm Works
Query Hydration
Fetches user engagement history and metadata to understand preferences
Candidate Sourcing
Retrieves posts from Thunder (in-network) and Phoenix Retrieval (out-of-network)
Candidate Enrichment
Adds core post data, author information, and media details
Pre-Scoring Filtering
Removes duplicates, aged content, blocked authors, and muted keywords
Scoring
Phoenix transformer predicts engagement probabilities with weighted scoring
Selection
Sorts by score and selects top K candidates for your feed
Post-Selection Validation
Final visibility checks and deduplication before display
Key Features
Zero Hand-Engineered Features
The system relies entirely on Grok-based transformer to learn relevance from user engagement sequences
Candidate Isolation
During ranking, posts cannot attend to each other, ensuring consistent, cacheable scores
15+ Action Predictions
Predicts probabilities for likes, replies, reposts, clicks, blocks, mutes, reports, and more
Real-Time Processing
Thunder enables sub-millisecond in-network lookups via in-memory storage
Modular Architecture
Composable pipeline framework allowing easy addition of new components
20,000 GPUs
Powered by xAI's Colossus data center in Memphis for massive scale inference
Why This Matters for Crypto Traders
Crypto Twitter Influence
X (formerly Twitter) is the primary social platform for crypto news, alpha, and community engagement. Understanding how the algorithm works helps you:
- Get crypto news and alpha faster in your feed
- Understand why certain posts go viral
- Optimize your own crypto content for visibility
- Filter out noise and focus on quality signals
Transparency Wins
Open-sourcing algorithms aligns with crypto\
- Auditable social media algorithms
- Community-driven improvements
- Reduced manipulation concerns
- Trust through verification
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Frequently Asked Questions
Where can I view the X algorithm source code?
The complete source code is available on GitHub at github.com/xai-org/x-algorithm under the Apache 2.0 license.
What is Phoenix in the X algorithm?
Phoenix is the Grok-based transformer model that predicts engagement probabilities for each post. It uses a two-tower retrieval model with user and candidate embeddings.
What is Thunder in the X algorithm?
Thunder is an in-memory post store that enables sub-millisecond lookups for in-network content. It consumes Kafka events and maintains per-user post collections.
How often will X update the open-source code?
Elon Musk promised updates every 4 weeks with comprehensive developer notes explaining what changed.
Does the algorithm use hand-engineered features?
No. The system relies entirely on the Grok-based transformer to learn relevance from user engagement sequences with zero hand-engineered features.