GLM-5.2 vs Llama 4 (405B)
Head-to-head technical comparison of intelligence, capabilities, and API pricing.
GLM-5.2
Z.ai
AI Mastery Index91.5
LMSYS Arena1465
Technical (MMLU-Pro)91.2%
Cost per 1M Tokens$1.4
Llama 4 (405B)
Meta
AI Mastery Index90.5
LMSYS Arena1440
Technical (MMLU-Pro)90.5%
Cost per 1M Tokens$0
Which should you use?
GLM-5.2 leads on the composite index by 1 points (91.5 vs 90.5).
Pick GLM-5.2 when
- Higher composite index — 91.5 against 90.5, a gap of 1 points.
- Ahead on Arena Elo by 25 points (1465 vs 1440), which is outside the board's published confidence intervals.
- Stronger on MMLU-Pro: 91.2% against 90.5%.
Pick Llama 4 (405B) when
On these measures Llama 4 (405B) does not lead GLM-5.2 anywhere, so pick it only for reasons outside this table — an existing integration, a region, or a contract.
Where these numbers come from
Figures as of 2026-09-14. Arena Elo and pricing are read from the public board and each vendor's own pricing page; see the full leaderboard for all 34 models and which columns are measured rather than estimated, or the benchmark matrix for scores benchmark by benchmark.