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GPT-5.4 mini vs Grok 4.3 Beta

GPT-5.4 mini · OpenAI, released 2026-03-17
Grok 4.3 Beta · xAI, released 2026-04-17

“Epoch AI, 'AI Benchmarking Hub'. Published online at epoch.ai. Retrieved from 'https://epoch.ai/benchmarks' [online resource].” · epoch.ai/benchmarks · Licensed CC BY 4.0 · data last verified 2026-07-26 · Methodology · Data Sources

Head-to-head

Measured on 5 of 9 tracked benchmarks for both models — Grok 4.3 Beta leads on 5.

BenchmarkGPT-5.4 mini Grok 4.3 BetaLeads
Epoch Capabilities Index (ECI)148.9149.0Grok 4.3 Beta
SWE-bench VerifiedNot measuredNot measuredNot measured on both
GPQA Diamond0.836 (high)0.888 (high)Grok 4.3 Beta
MATH Level 5Not measuredNot measuredNot measured on both
OTIS Mock AIME 2024-20250.872 (high)0.933 (high)Grok 4.3 Beta
FrontierMath0.283 (high)Not measuredNot measured on both
FrontierMath Tier 40.021 (high)Not measuredNot measured on both
SimpleQA Verified0.286 (high)0.380 (high)Grok 4.3 Beta
Chess Puzzles0.180 (high)0.250 (high)Grok 4.3 Beta
Benchmark results measure specific tasks and should not be treated as a universal measure of model quality. A model with no row here for a benchmark has not been measured on it — that is left blank, never estimated.

Full profiles

GPT-5.4 mini → · Grok 4.3 Beta → · the full AI Model Rankings table