Continually receiving "Model call failed" error message

[kkbruce]

Describe the bug

I tried to ask Copilot CLI to read and process the local .md files, but kept encountering the following error:

 ✘ Model call failed: {"message":"Invalid 'input[1].content': array too long. Expected an array with maximum length 0, but got an
   array with length 1 instead.","code":"invalid_request_body"} (Request ID: 6D98:99DAE:3FD3EB:50B61C:69250938)

 ✘ Model call failed: {"message":"Invalid 'input[1].content': array too long. Expected an array with maximum length 0, but got an
   array with length 1 instead.","code":"invalid_request_body"} (Request ID: 6D98:99DAE:3FE542:50CB7E:69250939)

 ✘ Model call failed: {"message":"Invalid 'input[1].content': array too long. Expected an array with maximum length 0, but got an
   array with length 1 instead.","code":"invalid_request_body"} (Request ID: 6D98:99DAE:3FF5CF:50E03B:69250941)

 ✘ Model call failed: {"message":"Invalid 'input[1].content': array too long. Expected an array with maximum length 0, but got an
   array with length 1 instead.","code":"invalid_request_body"} (Request ID: 6D98:99DAE:400A12:50F956:69250949)

 ✘ Model call failed: {"message":"Invalid 'input[1].content': array too long. Expected an array with maximum length 0, but got an
   array with length 1 instead.","code":"invalid_request_body"} (Request ID: 6D98:99DAE:4024E5:511AF2:69250952)

 ✘ Model call failed: {"message":"Invalid 'input[1].content': array too long. Expected an array with maximum length 0, but got an
   array with length 1 instead.","code":"invalid_request_body"} (Request ID: 737E:346E92:B21D0D:D8D5FC:69250971)

 ✘ Execution failed: Failed to get response from the AI model; retried 5 times (total retry wait time: 83.94361219402352 seconds)

Affected version

0.0.363

Steps to reproduce the behavior

1. copilot --model gpt-5 --allow-all-tools
2. Paste the prompt: Read the .md files and perform translation processing.
3. kept encountering the following error:

 ✘ Model call failed: {"message":"Invalid 'input[1].content': array too long. Expected an array with maximum length 0, but got an
   array with length 1 instead.","code":"invalid_request_body"} (Request ID: 6D98:99DAE:3FD3EB:50B61C:69250938)

 ✘ Model call failed: {"message":"Invalid 'input[1].content': array too long. Expected an array with maximum length 0, but got an
   array with length 1 instead.","code":"invalid_request_body"} (Request ID: 6D98:99DAE:3FE542:50CB7E:69250939)

 ✘ Model call failed: {"message":"Invalid 'input[1].content': array too long. Expected an array with maximum length 0, but got an
   array with length 1 instead.","code":"invalid_request_body"} (Request ID: 6D98:99DAE:3FF5CF:50E03B:69250941)

 ✘ Model call failed: {"message":"Invalid 'input[1].content': array too long. Expected an array with maximum length 0, but got an
   array with length 1 instead.","code":"invalid_request_body"} (Request ID: 6D98:99DAE:400A12:50F956:69250949)

 ✘ Model call failed: {"message":"Invalid 'input[1].content': array too long. Expected an array with maximum length 0, but got an
   array with length 1 instead.","code":"invalid_request_body"} (Request ID: 6D98:99DAE:4024E5:511AF2:69250952)

 ✘ Model call failed: {"message":"Invalid 'input[1].content': array too long. Expected an array with maximum length 0, but got an
   array with length 1 instead.","code":"invalid_request_body"} (Request ID: 737E:346E92:B21D0D:D8D5FC:69250971)

 ✘ Execution failed: Failed to get response from the AI model; retried 5 times (total retry wait time: 83.94361219402352 seconds)

Expected behavior

Read the .md files and perform translation processing.

Additional context

• session-cf12238d-99df-4a27-b87b-6406ddd7bb97.log
• Windows WSL (Ubuntu 22)
• Intel Core i7 1265U
• Windows Terminal
• bash

[buengx]

Just want to add to this, I got this error, but I just uninstalled copilot, upgraded both npm and node, then reinstalled it...

[AlexanderJohnston]

I get this error a lot and I have not been able to track down why.

Using GPT-5.1 for thinking, GPT-5.1-codex for implementation.

Edit: This appears to happen when switching models mid-session.

[hackermandh]

I had this issue with 0.0.362, upgraded to 0.0.365 and so far it looks better than it did before. Yes, 0.0.366 is already out, but not yet available on https://search.nixos.org/.

Yes, I use Nix BTW ^(on top of Debian).

[mohghaderi]

I am using

GitHub Copilot v0.0.394
Windows 11 (latest updates)
PowerShell 7.5.4
gpt-5-mini (medium) (0x)

still getting the same error:

Execution failed: Error: Failed to get response from the AI model; retried 5 times (total retry wait time: 84.04524552650227 seconds)
(Request-ID CAA8:1BDC3B:1620525:18A6F35:6977947D) Last error: CAPIError: 400 {"message":"","code":"invalid_request_body"}

I didn't switch the model in the middle of session and always used this model.

I think it happens when prompt tries to make lots of changes and sending context bigger than the model can take.

[andyfeller]

@kkbruce : First, my apologies for such a late response to your issue 🙇 From what I can tell, it appears that upgrading to a new model has resolved the model tool call issues you cited.