Lord Kelvin said it best : “When you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind.” Congrats to @BrendanFoody and @mercor_ai on delivering this for AI models
AI has its PhD and now it’s on the job market.
Introducing the AI Productivity Index (APEX), a benchmark that measures how well we’ve automated the most valuable industries in the world.
Most benchmarks study abstract capabilities. APEX evaluates model performance on real deliverables across law, finance, consulting, and medicine.
The models most capable of doing work today, according to APEX:
🥇 GPT 5
🥈 Grok 4
🥉 Gemini 2.5 Flash
Other findings:
- GPT 5 demonstrates the strongest performance across all 4 domains
- Some cheaper models outperform more expensive models from the same provider (e.g. Gemini 2.5 Flash vs. Gemini 2.5 Pro)
- The best open source model, Qwen (7th), performs only 2% behind Grok 4 overall
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