Cursor IDE
Same issue as Opus 4.7 via AWS Bedrock. Opus v4.8 is broken with this API Error:
The model returned the following errors: temperature is deprecated for this model.
Try to use Opus v4.8 via AWS Bedrock
MacOS
Version: 3.5.38
No - Cursor works, but with this issue
kevinn
May 28, 2026, 7:17pm
8
Hi @mjnowen Thanks for reporting, and I apologize for the inconvenience. This is a confirmed regression unfortunately. We fixed it with 4.7 but it has re-appeared with 4.8 We have a bug report raised for this and I’ll let you know when it is sorted out.
aislop
May 29, 2026, 12:49pm
9
Cursor IDE
just like in 4.7: Opus 4.7 not functioning on Bedrock because of Temperature deprecation / 400 - #12 .
switching to 4.7 works.
use aws bedrock credentials
enable us.anthropic.claude-opus-4-8
try to send a request
MacOS
Version: 3.5.38
us.anthropic.claude-opus-4-8
No - Cursor works, but with this issue
Having same issue with opus-4-8
kevinn
May 29, 2026, 6:41pm
11
Hi @here We just merged a fix for this, you should see 4.8 requests going thru Bedrock successfully soon. Please give it a shot and let us know if all is well. This is a server-side change, so no client update is required (although we always encourage you to keep Cursor up to date!)
kevinn
May 29, 2026, 8:02pm
13
Awesome! @Oguz_Akkas Thanks for confirming!
Yes, it works, but I also upgraded to Cursor v3.6.21 and now I have a new bug. Oh dear…
kevinn
May 29, 2026, 8:28pm
15
Ok thank you for highlighting! We’ve got a bug report open for this I’ll follow up on the other thread and let you know when any updates.