Disagree
Anthropic actively discourages external integrations with Claude Code and wants users locked into their CLI experience.
The author states Anthropic wants users in their CLI using their features and prevents programmatic API access without charging more money.
Source: Claude Code vs Codex vs Cursor (an honest comparison)Agree
The Codex app server is open source, enabling developers to build on top of it, which is how the author's T3 Code app was built.
The author says his agentic coding app 'would not exist if it wasn't for the Codex app server, which is part of the open source Codex CLI.'
Source: Claude Code vs Codex vs Cursor (an honest comparison)Disagree
Cursor has historically not done a great job building integrations and SDKs, with their CLI and Agent Client Protocol being far behind.
The author describes attempting to integrate Cursor into T3 Code and finding the cursor CLI 'super behind' with hardcoded, outdated models.
Source: Claude Code vs Codex vs Cursor (an honest comparison)