Model profile
Grok 4 Fast
Evidence summary
Grok 4 Fast has an estimated overall rank of #184; its 90% source-sensitivity interval is #80–#266. Its behavior-only rank is #177; company governance moves the combined estimate to #184. Published evidence spans 15 evals and 5 of 7 behavior components. Its strongest relative result is PHARE (bias_resistance_diagnostic, #2 of 66); its weakest is CAIS Risk Index (mask, #50 of 52).
Compare this model
Only models sharing at least one published sub-eval are listed.
Official and reference links
- Artificial Analysis ↗grok-4-fast
- OpenRouter ↗x-ai/grok-4-fast
- Official model documentation ↗Family-level model document · xai · first party
- Release source ↗direct research preview identity date
Published eval results
Rank is within that sub-eval. Black marks the observed result; the grey dot marks the value implied by the global rank. Values stay on each source’s native scale.
| Eval / sub-eval | Rank | Value | Distribution | Source |
|---|---|---|---|---|
| AA-Omnisciencehallucination_rate | #102 / 328 | ↓0.6827 | Source ↗official | |
| AgentDrive Safety Compliancescr | #20 / 48 | ↑88.75 | Source ↗official | |
| ANIMAscore | #16 / 22 | ↑0.6164 | Source ↗official | |
| Arena Factuality — Search Arena (factuality-only weighting)factuality_bt_rating | #28 / 30 | ↑1112.0 | Source ↗official | |
| Arena Factuality — Text Arena (factuality-only weighting)factuality_bt_rating | #68 / 112 | ↑1430.0 | Source ↗official | |
| BrokenMathsycophancy | #4 / 9 | ↓40 | Source ↗official | |
| CAIS Risk Indexbioweapons_assistance | #20 / 49 | ↓64.1 | Source ↗official | |
| CAIS Risk Indexhle_overconfidence | #36 / 50 | ↓68.7 | Source ↗official | |
| CAIS Risk Indexmachiavelli | #41 / 46 | ↓96.2 | Source ↗official | |
| CAIS Risk Indexmask | #50 / 52 | ↓70 | Source ↗official | |
| CAIS Risk Indexpolitical_manipulation | #2 / 33 | ↓30.8 | Source ↗official | |
| CAIS Risk Indextextquests_harm | #29 / 49 | ↓19.8 | Source ↗official | |
| Cisco AI Defense Rolling Single-Turn Leaderboardsingle_turn_attack_success_rate | #43 / 104 | ↓30.03 | Source ↗official | |
| MACHIAVELLIdeception_relative_random_pct | #43 / 50 | ↓96.2 | Source ↗official | |
| PHAREbias_resistance_diagnostic | #2 / 66 | ↑0.8026 | Source ↗official | |
| PHAREhallucination_resistance_diagnostic | #62 / 70 | ↑0.634 | Source ↗official | |
| PHAREharm_resistance_diagnostic | #64 / 70 | ↑0.8134 | Source ↗official | |
| PHAREjailbreak_resistance_diagnostic | #49 / 67 | ↑0.412 | Source ↗official | |
| UAVBench safety-critical decision recognitionethical_safety_critical_accuracy | #14 / 27 | ↑0.695 | Source ↗official | |
| Vectara HHEM Factual Consistencyfactual_consistency_rate | #90 / 94 | ↑80.05 | Source ↗official |
Values evaluations
Descriptive values and political-framing results are separate from safety/ethics ranks. Each strip shows the evaluation’s observed model range; its endpoint labels state what lower and higher values mean.