Add openai style cost calculation

[dtrugman]

Context

The project had only one "method" of cost calculation, the Anthropic method, where the reported "input tokens" do NOT include the number of "cache read tokens".

This change introduces a new method that calculates the price correctly when the use is reported in an OpenAI compatible format, i.e. where the "input tokens" INCLUDE the "cache read token" count.

And uses the new method to correctly calculate the price for the Requesty provider.

Implementation

Renamed calculateApiCost to calculateApiCostAnthropic and created a new calculateApiCostOpenAI method.
Both reuse the same underlying method.

Screenshots

Before:
Reported interaction/task cost for Requesty is incorrect

After:
Reported interaction/task cost for Requesty is correct

How to Test

There are unit-tests that cover both cost calculation methods.
The Anthropic method is covered by the existing tests.
And a new OpenAI method that is covering the new method.

Set up the Requesty provider.
Use any OpenAI model, e.g. openai/gpt-4o-mini.
Make sure the cost is correct.

I tested manually Requesty, Deepseek, OpenAI and Anthropic. All work as expected (Requesty fixed, no regressions for other providers).

Get in Touch

@ditti.o on discord

---

Important

Adds OpenAI-style cost calculation and updates relevant components and tests.

• Behavior:
  • Introduces calculateApiCostOpenAI in cost.ts for OpenAI-style cost calculation, where input tokens include cached tokens.
  • Updates RequestyHandler in requesty.ts to use calculateApiCostOpenAI.
  • Updates Cline in Cline.ts to use calculateApiCostAnthropic.
• Refactoring:
  • Renames calculateApiCost to calculateApiCostAnthropic.
  • Adds calculateApiCostInternal to handle shared logic.
• Testing:
  • Adds tests for calculateApiCostOpenAI in cost.test.ts.
  • Updates tests for calculateApiCostAnthropic in cost.test.ts.

^{This description was created by for 7d038607066de19aff9912c4c9f7411f1fef1ece. It will automatically update as commits are pushed.}

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[dtrugman]

Fixing tests...

[dtrugman]

Hi @mrubens,
This PR adds support for OpenAI-style price calculation, which will be useful for OpenAI & Deepseek providers as well (The current calculation is wrong).
I had to touch more files than I would ideally want, but tried to make them as clear and contained as possible.

If you are not interested in promoting this change, I can simply copy the right, openai-style calculation into the requesty.ts file and only touch that one. Would that help us merge that quicker?

[mrubens]

Thanks for the fix!