[Bug]: GPT-5-nano does temperature = 0

[BB-BenBridges]

Opencommit Version

3.2.10

Node Version

20.19.3

NPM Version

10.8.2

What OS are you seeing the problem on?

Mac

What happened?

When generating a commit message using gpt-5-nano i get the following error:

2025-08-08 11:36:12.822 [info] ┌  opencommit
�[?25l│
○  Generating commit message
�[999D�[1A◒  Generating commit message   
�[999D�[1A◐  Generating commit message   
�[999D�[1A◓  Generating commit message   
�[999D�[1A◑  Generating commit message   
│
└  ✖ Error: 400 Unsupported value: 'temperature' does not support 0 with this model. Only the default (1) value is supported.

Expected Behavior

No errors, commit message is generated

Current Behavior

2025-08-08 11:36:12.822 [info] ┌  opencommit
�[?25l│
○  Generating commit message
�[999D�[1A◒  Generating commit message   
�[999D�[1A◐  Generating commit message   
�[999D�[1A◓  Generating commit message   
�[999D�[1A◑  Generating commit message   
│
└  ✖ Error: 400 Unsupported value: 'temperature' does not support 0 with this model. Only the default (1) value is supported.

Possible Solution

No response

Steps to Reproduce

Set the model to gpt-5-nano

Relevant log output

2025-08-08 11:36:12.822 [info] ┌  opencommit
�[?25l│
○  Generating commit message
�[999D�[1A◒  Generating commit message   
�[999D�[1A◐  Generating commit message   
�[999D�[1A◓  Generating commit message   
�[999D�[1A◑  Generating commit message   
│
└  ✖ Error: 400 Unsupported value: 'temperature' does not support 0 with this model. Only the default (1) value is supported.

[di-sukharev]

hi Ben, you need to set temperature to not zero. this requires a PR that add something like OCO_TEMPERATURE and sets it here

opencommit/src/engine/openAi.ts

Line 42 in c904a78

temperature: 0,

would you like to contribute a PR?

[BB-BenBridges]

@di-sukharev hopefully this isn't too hacky for you 😄

#512

I tested it and it seems to work as I now get the error in #510