Based on 4 capability dimensions
ChatGPT Best For
Repository coding and rapid iteration
Avoid if: You need non-technical, no-setup workflows
GitHub Copilot Best For
Repository coding and rapid iteration
Avoid if: You need non-technical, no-setup workflows
5 versions
GPT-5.5 is described as OpenAI's smartest model yet, offering faster performance and increased capabilities. It is built for complex tasks including coding, research, and data analysis across tools.
Reasoning model that thinks before answering. Excels at complex math, science and coding problems.
Omni model. Faster and cheaper than GPT-4. Real-time audio and vision. Emotional voice responses.
Massive capability jump. Multimodal inputs introduced. Passed bar exam in top 10 percentile.
Initial ChatGPT launch. Shocked the world with conversational AI. Reached 1 million users in 5 days.
3 versions
Autonomous agent mode. Plan, build and test features from a GitHub issue with minimal input.
Conversational coding assistant added. Ask questions about your code directly in the editor.
First AI pair programmer. Trained on public GitHub repos using OpenAI Codex. Technical preview launched.