Performance Benchmarks for grok-4.3

Analyze how grok-4.3 stacks up against other frontier models in terms of cost-to-performance and raw intelligence (LMArena Elo).

2026 Performance Summary

🚀 Intelligence (Elo): 1451
💰 API Cost (Input): $0.00000125 / 1M tokens
⚡ API Cost (Output): $0.0000025 / 1M tokens
⏱️ Real-world Throughput: 76 tokens/s

Analysis: While grok-4.3 is a capable model, it is currently outperformed in efficiency by gemini-3.1-pro-preview. gemini-3.1-pro-preview sits higher on the Pareto line, offering approximately 37 points more intelligence (Elo) for a comparable or lower API cost.

Highly Recommended Alternatives

Frontier Model	LMArena Elo	API Cost (1M)	Throughput
gemini-3.1-pro-preview	1488	$0.000002	79
gpt-5.5	1477	$0.00000125	31
gemini-3-flash	1473	$5e-7	76
deepseek-v4-pro-thinking	1461	$4.35e-7	27
gemma-4-31b	1451	$1.2e-7	13

*These models represent the Pareto Frontier (optimal cost-to-performance).*