---
title: "LLM API Cost Calculator (GPT-4o, Claude, Gemini)"
method: POST
path: "/api/v1/tools/llm-api-cost-calculator"
tags: ["ai"]
---

# LLM API Cost Calculator (GPT-4o, Claude, Gemini)

`POST /api/v1/tools/llm-api-cost-calculator`

## Request

- Base URL: `https://calcfleet.com`
- URL: `https://calcfleet.com/api/v1/tools/llm-api-cost-calculator`
- Auth: none declared

Estimate monthly API costs for GPT-4o, Claude, and Gemini from tokens per request and volume. See input vs output cost split. Prices as of 2025 — verify.

## Request body

- object
  - `model` 'gpt-4o' | 'gpt-4o-mini' | 'claude-opus' | 'claude-sonnet' | 'claude-haiku' | 'gemini-1.5-pro' | 'gemini-1.5-flash', required
  - `inputTokensPerReq` number, required
  - `outputTokensPerReq` number, required
  - `requestsPerMonth` number, required

## Response `200`

Successful calculation result.

- object
  - `result` object, required: Structured calculation output (fields vary per calculator).

## Other responses

- `400`: Invalid input — the issues array contains Zod validation errors.
- `403`: Forbidden — an Authorization: Bearer cf_… key was supplied but is invalid.
- `404`: Unknown tool slug.

---

[API](https://skmtc.dev/calcfleet/apis/calcfleet-financial-calculators-api.md) · [All operations](https://skmtc.dev/calcfleet/apis/calcfleet-financial-calculators-api/llms.txt) · [OpenAPI document](https://skmtc.dev/calcfleet/apis/calcfleet-financial-calculators-api/revisions/cd9abd595bbe?raw)