I thought I’d try Composer 1.5, after an amazing week with Opus 4.6. I loved Composer 1 - the fast/accuracy balance was superb. The pattern with 1.5 is: Me - “do a thing” Composer 1.5 - “here’s how to do the thing” Such a shame; the harness seems to be off, making it ‘lazy’ (like when we initially had GPT5-Codex).

Merging into our first impressions thread.

Composer 1.5 is disappointing

Topic		Replies	Views
I really miss Composer 1 Discussions composer	0	101	March 17, 2026
Composer 1 dumber? Discussions	9	451	February 6, 2026
Share your experience with Composer 1.5! Release Discussions composer	92	8008	March 10, 2026
Composer 1.5 significantly worse Feedback composer	2	137	March 20, 2026
I am in love with Composer 1.5 Discussions composer	5	622	February 23, 2026