Radar

Every published move

We treat home-mixer/params/param.rs as a production config file. When X changes a default, the playbook changes.

Poll xai-org/x-algorithm now

Fetches param.rs and diffs it against the baked snapshot.

2026-08-13transparency

Production weights and visibility filtering go public

xai-org/x-algorithm expands 10–15×. home-mixer/params/param.rs now publishes the live-default action weights. Visibility filtering, Scarecrow/Botmaker, Agatha, SimClusters, and Phoenix training code ship. Under the Hood report launches for eligible accounts.

Treat the published weights as the source of truth. Recalibrate every playbook that still cites the 2023 Heavy Ranker numbers (those are stale).

https://github.com/xai-org/x-algorithm + TechCrunch 2026-08-13

2026-07-24weights

Bidirectional follow reply boost 20 → 15

After the World Cup weekend, X cut BidirectionalFollowReplyWeightBoost from 20.0 to 15.0 so more OON conversation (people you don't mutually follow) could surface.

Mutuals still matter — effective reply weight is 5+15=20, not 25. Originals only; replies and reposts never got this boost.

docs/BIDIRECTIONAL_BOOST_CHANGE.md

2026-07-13weights

Mutual-follow reply boost rolls out at 20

Broad launch of BidirectionalFollowReplyWeightBoost=20 on original posts from accounts you mutually follow. Dwell boost was tested and not shipped (still 0).

Prioritize original posts over reply-guy volume if you want the boost. Build a real mutual graph in your niche.

docs/BIDIRECTIONAL_BOOST_CHANGE.md

2026-07-10experiment

Bidirectional boost A/B test starts

Small percentages of viewers assigned boost values of 5, 10, 15, or 20. Most users still at 0.

Ignore anecdata from this week — feeds were split on purpose.

docs/BIDIRECTIONAL_BOOST_CHANGE.md

2026-05-15pipeline

Grox, ads blender, Phoenix pipeline

Largest 2026 commit before August: Grox classifiers, ads module, phoenix/run_pipeline.py, more hydrators and sources.

Content is classified, not just engaged with. Spam-shaped posts get filtered before ranking.

xai-org/x-algorithm May 15 2026 commit

2026-01-20pipeline

Grok-powered Phoenix ranker open-sourced

xAI replaces the old Scala Heavy Ranker dump with a Rust/Python Phoenix transformer and commits to public updates.

Stop optimizing for 2023 hand-tuned features (TweepCred thresholds, static 13.5 reply weights). The heads are predicted, then weighted.

github.com/xai-org/x-algorithm

Full snapshot · 25 published knobs

Param	Value	Why it matters
Share via copy link ShareViaCopyLinkWeight	20	Someone copies the post URL. Highest positive weight in the published ranker — 40× a like.
Reply ReplyWeight	5	A public reply. 10× a like. The conversation engine of For You.
Quote QuoteWeight	5	A quote post. Same weight as a reply. People adding their take.
Share via DM ShareViaDmWeight	5	Forwarded in DMs. Same weight as a reply. Privately sendable posts win.
Follow author FollowAuthorWeight	4	Viewer follows you from the post. 8× a like.
Share ShareWeight	2	Generic share action. 4× a like.
Repost RetweetWeight	1	A repost. Only 2× a like — weaker than a quote or a reply.
Like FavoriteWeight	0.5	The baseline. Cheap, common, and now one of the weakest positive signals.
Post click ClickWeight	0.4	Opening the post. Slightly below a like.
Open link OpenLinkWeight	0.2	Clicking an outbound link. Small upside, and it usually kills dwell. Put links in a reply.
Photo expand PhotoExpandWeight	0.05	Expanding an image. Tiny. Media helps more via dwell than via this head.
Video open VideoOpenWeight	0.05	Opening a video. Tiny versus conversation heads.
Video quality view VqvWeight	0.05	A quality video view. Present, but not the game.
Quoted-post click QuotedClickWeight	0.05	Clicking through a quote. Minor.
Profile click ProfileClickWeight	0	Published at 0. 'Follow for more' does not score via profile clicks.
Dwell (binary) DwellWeight	0	The binary dwell head is currently weighted 0. Continuous dwell time still exists.
Continuous dwell time ContDwellTimeWeight	0.004	How long they actually look. Small per-second weight; still the anti-scroll signal.
Mutual-follow reply boost BidirectionalFollowReplyWeightBoost	15	Added to ReplyWeight for original posts (not replies/reposts) from accounts you mutually follow. Effective reply weight becomes 20. Rolled back from 20 → 15 on 2026-07-24.
Out-of-network discount OonWeightFactor	0.75	OON posts are multiplied by 0.75. In-network replies and reposts get the same discount.
Author diversity decay AuthorDiversityDecay	0.5	Each extra post from the same author in a slate is multiplied by 0.5^k, floored at 0.25. Don't dump.
Not dwelled NotDwelledWeight	-0.02	Scroll-past. Small per event, but it is the common death of a post.
Block author BlockAuthorWeight	-31.2	A block. Severe, but mute is worse in the published weights.
Not interested NotInterestedWeight	-43.2	'Show less' / not interested. ~86 likes of damage.
Mute author MuteAuthorWeight	-58.8	A mute. Worse than a block in this ranker (~118 likes of damage).
Report ReportWeight	-234	A report. Catastrophic. ~468 likes of damage. Do not farm this.