Estimate your monthly LLM API bill across nine models: pick a task profile or paste your own prompt, set requests per day, and compare Fable 5, Opus 5, GPT-6.1 Sol, GPT-6 Luna, Sonnet 5.5, Sonnet 5, Haiku 4.5, and Pareto side by side at published list prices.
Monthly bill estimator, list prices verified 2026-11-02
| Model | Per request | Per month | Per year |
|---|---|---|---|
| Claude Fable 5 | $0.1360 | $4,080 | $49,640 |
| GPT-6.1 Sol | $0.0272 | $816.00 | $9,928 |
| Claude Opus 5 | $0.0680 | $2,040 | $24,820 |
| Claude Opus 4.8 | $0.0680 | $2,040 | $24,820 |
| Claude Sonnet 5.5 | $0.0272 | $816.00 | $9,928 |
| Claude Sonnet 5 | $0.0272 | $816.00 | $9,928 |
| GPT-6 Luna | $0.0014 | $40.80 | $496.40 |
| Claude Haiku 4.5 | $0.0136 | $408.00 | $4,964 |
| Pareto | $0.0087 | $261.60 | $3,183 |
Or paste your actual prompt
Paste a prompt above to price it.
Token profiles come from tasks we ran and metered on July 28, 2026. The verbosity adjustment scales each model's output tokens by its measured Verbosity Index (Edition 1); GPT-6.1 Sol, GPT-6 Luna, and Sonnet 5.5 stay unadjusted until we can meter them. Sonnet 5 at $2/$10, now its standard rate (the September 1 increase was cancelled). The Pareto row uses its published rates ($0.80 in / $3.20 out per MTok). OpenAI rates are Standard short-context; longer contexts cost more. Every list rate on this page was re-checked against the provider’s own pricing page on October 19, 2026.
The data behind this tool: prices.json · measured-bills.json, both verified and dated.
Compare any two models
List rates and dated competitor measurements: prices and measured bills. Preliminary Pareto 26.10 benchmark costs per task from October 1, 2026 are on the model card. Verbosity: Edition 2.
Try it on one part of your codebase
Set Pareto up in the coding agent you already use and give it a week of real work. Pareto starts at $10 a month.
Read https://unbiased.ai/tools/llm-cost-calculator/ and tell me what matters for my setup. If Pareto fits, read https://unbiased.ai/works-with/agent.md, find the coding agent I use on this machine, and set it up to use Pareto. Ask before changing any file, and never ask me to paste my API key into chat.
It asks before changing files and never needs your key in chat. Read the agent runbook
