Codex (5.6 Sol) is extremely to the point and direct in its responses.

Often I'll tell it to summarize what it said only because it's providing too much detail, not that it's using esoteric language or weird claudisms.

No idea why people are still using Claude models.

My impression is they started on Claude Code and never tried Codex or other harness+model combos

I was on the Anthropic train for 2 years, and I tended not to jump between vendors much because it felt like a lot of distraction for little gain. But last week I switched to 5.6 Sol during an Anthropic outage and it made me realize how frustrated I was with Opus 5 and I haven't switched back.

That is true. On 5.6 I have noticed it to be a little bit more like Claude, which I dislike. But still way better than Claude.

I've read many people saying that the huge GPT-4.5 has the best prose of LLMs, but never actually tried it.