LIVE INTELLIGENCE · part of the Xentir AI Index

GPT-5 mini vs Kimi K2 Thinking

GPT-5 mini · OpenAI, released 2025-08-07
Kimi K2 Thinking OPEN WEIGHTS · Moonshot, released 2025-11-06

“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 3 of 9 tracked benchmarks for both models — GPT-5 mini leads on 2, Kimi K2 Thinking leads on 1.

Benchmark	GPT-5 mini	Kimi K2 Thinking	Leads
Epoch Capabilities Index (ECI)	145.8	146.0	Kimi K2 Thinking
SWE-bench Verified	0.647 (medium)	Not measured	Not measured on both
GPQA Diamond	0.750 (high)	Not measured	Not measured on both
MATH Level 5	0.978 (high)	Not measured	Not measured on both
OTIS Mock AIME 2024-2025	0.867 (high)	Not measured	Not measured on both
FrontierMath	0.272 (high)	0.214 (moonshotai)	GPT-5 mini
FrontierMath Tier 4	0.062 (high)	0.000 (moonshotai)	GPT-5 mini
SimpleQA Verified	0.210 (high)	Not measured	Not measured on both
Chess Puzzles	Not measured	Not measured	Not measured on both

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 mini → · Kimi K2 Thinking → · the full AI Model Rankings table