Hi! I recently created an account on openrouter.ai and I'm trying to use the model anthropic/claude-sonnet-4, but I get the error:
"The model anthropic/claude-sonnet-4 does not work with your current plan or API key"
Also, I can't access the /account/usage page – it says:
The model "account/usage" is not available.
Could you please check if my account is fully activated and enable access to this model? Thank you!