Notes on using OpenRouter's free models

After recharging $10 on OpenRouter, you get 1000 free model calls per day, which is more than enough for me to use for validation. But for a long time, many of its models kept returning 429 errors, such as openai/gpt-oss-120b:free. Today I manually tested various methods and finally confirmed…

After recharging $10 on OpenRouter, you get 1000 free model calls per day, which is more than enough for me to use for validation. But for a long time, many of its models kept returning 429 errors, such as openai/gpt-oss-120b:free. Today I manually tested various methods and finally confirmed that some models do not return responses to requests with Chinese system prompts.

Illustration 1 for Notes on using OpenRouter’s free models

Illustration 2 for Notes on using OpenRouter’s free models