OpenAI flagship multimodal model with 128K context. Strong code (92/100) and instruction following (94/100). Handles vision, audio, and text in unified architecture.
Epoch Capabilities Index score
Normalized ECI score (0-100)
Maximum input token capacity
Organization that created the model
Model development country
Access method (API, download, etc.)
Model weights publicly available
Open source availability
Epoch AI benchmark identifier
Code generation, understanding, and debugging
Mathematical reasoning and problem solving
Multi-step logical reasoning
Overall reasoning and task completion ability
| Dimension | Score |
|---|---|
| Intelligence | 80.0 |
| Reasoning | 77.0 |
| Math | 74.0 |
| Code | 80.0 |
| Instruction Following | 82.0 |
| Overall | 80 |
The ChatGPT mobile app was downloaded 1.9 billion times between October 2024 and September 2025, making it the most downloaded app of the year as usage shifts from web to mobile.
ChatGPT grew from under 400M weekly active users in January 2025 to nearly 800M by August, adding roughly 50M new users per month. Growth has since slowed but remains substantial.
Epoch AI's estimate of GPT-4o energy cost was corroborated by Sam Altman and matches Google's Gemini data. Average query uses less energy than running a lightbulb for 5 minutes.
ChatGPT maintains massive consumer adoption with 800-900M weekly active users. Only 9% of consumers pay for multiple AI subscriptions, indicating 'winner take most' market dynamics rather than fragmentation.