Elon Musk reposted
Kun Chen
@kunchenguid
grok 4.5 made me give grok build a serious run today
here's my honest first impression (non affiliated neutral view point):
1. grok build is a very good harness
firstmate stretches harness capabilities to their limits, and i've been testing it with claude code, codex, opencode, pi and grok build
so far, grok build and claude code are the only two harnesses that can automatically wake up when the background polling process finishes
codex hard fails on this kind of background polling task, with no escape hatch. opencode and pi can both do it with custom plugins, but not out of the box
grok build also feels really clean, smooth, and transparent. you can see what background tasks are running, what hooks got triggered at what step, context window, token usage etc all out of the box and somehow the UI does not feel cluttered at all
2. grok 4.5 is a very good model
i've been using opus 4.8 as my primary firstmate, and today i did a full switch to grok 4.5. so far i don't think anything degraded, while token throughput is a lot faster, although time-to-first-byte for each response seems long - i wonder if prompt caching is done properly or no
3. the quota that comes with X premium is quite generous, and there's no session level limit
so overall i'm quite pleased by this and plan to switch a lot of my tasks to grok. the landscape just got a lot more interesting...
02:11 AM · July 9, 2026 · 124K views
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