Although I unsubscribed from Claude, I still use Claude Code. As a coding agent, Claude Code is the strongest on the face of the earth, bar none. Codex is very strong at coding, but its strength comes purely from the GPT model. As for Gemini CLI, don’t even mention it—it’s just imitating.
So right now there are really two front lines of competition: models and coding agents. That may not seem obvious yet, because everyone is still focused on models. Once agents expand from coding into other fields, the advantages of Claude Code, including the SDK, will become fully apparent.