Compare platforms
| ChatGPT | Claude | |
|---|---|---|
| Company | OpenAI | Anthropic |
| Best for | All-round assistant with strong persistent personalization (Custom Instructions + Memory + Projects). | Long documents, careful reasoning and writing; Projects carry persistent instructions. |
| Models | GPT model family (multiple tiers) | Claude model family (multiple tiers) |
| Free plan | Yes, capable free tier | Yes |
| Paid plans | Paid subscriptions add stronger models and higher limits | Paid subscriptions add stronger models and higher limits |
| API | Yes (OpenAI API, separate from the consumer app) | Yes (Anthropic API) |
| Custom instructions | Yes, Custom Instructions (persistent), plus per-Project instructions | Yes. Project instructions, personal preferences, and custom Styles |
| Memory | Yes, optional cross-chat memory | Yes, memory features on recent versions |
| File upload | Yes | Yes |
| Web search | Yes | Yes |
| Context window | Model-dependent; large on current tiers | Very large, a signature strength |
| Apps | Web · iOS · Android · Windows · macOS | Web · iOS · Android · desktop · Claude Code (terminal) |
| Profile fit | excellent · guide | excellent · guide |
Reviewed 2026-08-10 / 2026-08-10 · verify details on the official sites. They change often.
Whichever you pick, your Agent of Me profile travels with you, that is the point.