I find that even with opus 4.6, copilot feels like it’s handicapped. I’m not sur...

chaostheory · 2026-03-18T11:38:50

I have the same experience with Antigravity and Gemini CLI, both using Gemini 3 Pro. CLI works on the problem with more effort and time. Meanwhile, antigravity writes shitty python scripts for a few seconds and calls it a day. The agent harness matters a lot

Atotalnoob · 2026-03-18T13:59:18

Copilot feels like being a caveman, Claude code feels like modern times comparatively.

gtirloni · 2026-03-18T15:07:14

I think this shows that the model alone isn't the complete story and that these "harnesses" (as people seem to be calling them) shape a lot of the experienced behavior of these tools.

theshrike79 · 2026-03-19T21:15:21

My analogy is that the model is the engine and the harness is the driver and chassis.

You can have the biggest monster of an engine ever, but if you put it in a tricycle and a grandma is driving, you won't get good results.

codebolt · 2026-03-18T19:53:43

Opus 4.6 has a 200k context limit in Copilot. Could be the issue.

ValentineC · 2026-03-31T08:16:32

IIRC the context limit in Copilot is actually 128k, not 200k.

200k is the normal context limit elsewhere.

nfg · 2026-03-18T06:28:32

As a matter of interest are you using the copilot cli?

whalesalad · 2026-03-18T13:37:18

yeah. copilot cli using opus 4.6 vs claude code using opus 4.6

nfg · 2026-03-18T20:50:36

If you could share I’d be really interested in hearing a concrete example of the two behaving differently. I work in Microsoft (not on copilot - though I’m an heavy user, and use Claude code in a personal capacity) and would be quite happy to repro and report back to the copilot cli team who are responsive.