Incorrect pricing for OpenRouter `:free` model variants

[alejandrosnz]

In the API that lists all LLMs on the market, there is an issue with pricing for some OpenRouter models that have a :free variant.

Currently, both the paid model and its :free variant are returned with a cost of 0, which is incorrect.

The expected behavior is:

• The paid model should show its actual pricing
• The :free variant should have cost: 0

Example

"mistralai/mistral-small-3.2-24b-instruct": {
  "id": "mistralai/mistral-small-3.2-24b-instruct",
  "cost": { "input": 0, "output": 0 }
},
"mistralai/mistral-small-3.2-24b-instruct:free": {
  "id": "mistralai/mistral-small-3.2-24b-instruct:free",
  "cost": { "input": 0, "output": 0 }
}

In this case, the paid model should not have a zero cost.

Scope

I’ve observed this issue in:

• mistralai/mistral-small-3.2-24b-instruct
• Google Gemma models with :free variants

But it could be others

Expected behavior

• Paid models expose correct pricing
• Only :free variants have cost.input = 0 and cost.output = 0