Choose your AI model

Use GPT-6.1 Sol or Claude Opus 5.5 on medium effort as your daily driver.

Which AI model should you use?

Claude Opus 5.5 is the best model right now. It fixes most of Opus 5’s problems, has a great personality, and writes well. But the harness, the app and tools around the model, matters just as much, and ChatGPT is still ahead there.

Here’s my take on which model to use depending on your harness:

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