Cost of AI content writing with an API
What blog posts, product descriptions and marketing copy cost to generate with an LLM.
Estimated monthly cost — Article drafts
Calculated live from current TokenRex prices.
| Model | Input / 1M | Output / 1M | Per month |
|---|---|---|---|
| GPT-6 Luna | $0.10 | $0.50 | $2.04 |
| Claude Haiku 4.5 | $1.00 | $5.00 | $20.40 |
| Gemini 3.8 Flash | $0.75 | $3.75 | $15.30 |
| Gemini 3.1 Flash Lite | $0.25 | $1.50 | $6.00 |
| Claude Sonnet 5 | $2.00 | $10.00 | $40.80 |
| GPT-6 Astra | $10.00 | $50.00 | $204.00 |
The workload we priced
2,000 requests a month, each with about 1,200 input tokens and 1,800 output tokens. One token is roughly three quarters of an English word.
What drives the bill
Long-form writing is output-heavy, so compare output prices.
Draft with a cheaper model, then polish with a stronger one if needed.
Questions
- Are these exact monthly bills?
- They are estimates from live TokenRex prices and the token counts shown. Real bills depend on your actual prompt and reply lengths, which every API response reports in its usage field.
- How do I lower the cost?
- Shorten system prompts, cap reply length, cache repeated input where the model supports it, and send simple requests to a smaller model.
- Which currency am I billed in?
- Wallet top-ups and billing are in Indian rupees. Prices display in US dollars by default, and signed-in users can choose another display currency.
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- What is prompt caching?
- How to reduce LLM API costs
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