the best one and my main coding agent. i use the codex app for feature builds, refactors, debugging, and full sessions end to end.

long-context reasoning model. good for deep research, reading large codebases, and sustained multi-turn conversations.

used via the api as deepseek-v4-pro for agentic coding, long-context repo work, and multi-step implementation tasks.

used to be the main coding setup, but the plan got cancelled after codex took over day-to-day coding work.

inline completions and chat inside vs code. always-on suggestions while writing code, and a quick way to ask questions without leaving the editor.

used via the gemini cli and api. good for a second opinion, research, and integrating google's models directly into projects.