Grok 4.1

Grok 4.1

Proprietary xAI · — · Proprietary

Incremental Grok 4 update released November 17 2025 after a two-week silent rollout where xAI ran live blind evaluations and reported users picked 4.1 responses 64.78 percent of the time. Headline gains were emotional intelligence and reduced hallucinations. Shipped alongside Grok 4.1 Fast with a 2M-token context window.

Architecture

Schema-generated from data/models.yaml. Every label is auditable against the model's sources.

Specs

Architecture: unknown
Total params: not disclosed
Active params: not disclosed
Context window: not verified
Attention: unknown
Position encoding: unknown
Post-training: rlhf
OSI-approved: no
Data released: no
Training code: not released

Benchmarks

Each score carries the date it was published; we never infer or interpolate missing scores.

Available quantizations

None. The weights are not distributed, so there are no public quantizations.

Notable innovations

· 2M context window on Grok 4.1 Fast
· Live silent-rollout evaluation methodology
· Reduced hallucination via uncertainty signaling

Lineage

Conversational and reliability update; companion Grok 4.1 Fast adds 2M context.

Derived from

Grok 4 2025-07-09

Derivatives