AiGanakCheapest AI for message classification, by model and language
Classify or route messages: what a typical job costs on every current OpenAI, Anthropic and Google model, in English, Hindi, Tamil and German. Choosing one label from a short list is the cheapest kind of job. Small models are normally enough.
Classify or route messages: a typical job is 670 tokens per message. At list prices checked 9 November 2026, the lowest-cost small-class model is GPT-6 Luna in English ($0.075 per 1,000 messages) and GPT-6 Luna in Hindi ($0.086 per 1,000 messages). Costs shown for English, Hindi, Tamil and German on every current OpenAI, Anthropic and Google model.
The pick, by language
Small class is the smallest model class that normally handles this job. The pick is the lowest-cost current model of that class or above.
| Language | Lowest-cost model | Per 1,000 messages | Per month at 50,000 messages |
|---|---|---|---|
| English | GPT-6 Luna OpenAI | $0.075 | $4 |
| Hindi | GPT-6 Luna OpenAI | $0.086 | $4 |
| Tamil | GPT-6 Luna OpenAI | $0.098 | $5 |
| German | GPT-6 Luna OpenAI | $0.081 | $4 |
Cost per 1,000 messages
Typical job: 400 tokens of instructions, 250 read and 20 written per message, counted in English tokens on the reference model family and converted for each model family and language with the measured token tax (4 November 2026). Standard list prices, no caching, no batch discount.
| Model | English | Hindi | Tamil | German |
|---|---|---|---|---|
| GPT-6 Luna OpenAI · Small | $0.075 | $0.086 | $0.098 | $0.081 |
| Claude Haiku 5.5 Anthropic · Small | $0.110 | $0.157 | $0.191 | $0.146 |
| Gemini 3.5 Flash-Lite Google · Small | $0.259 | $0.274 | $0.288 | $0.282 |
| Gemini 3.8 Flash Google · Mid | $0.595 | $0.631 | $0.666 | $0.652 |
| GPT-6.1 Terra OpenAI · Mid | $0.750 | $0.857 | $0.978 | $0.812 |
| GPT-6.1 Sol OpenAI · Mid | $1.50 | $1.71 | $1.96 | $1.62 |
| Gemini 4 Argon Google · Flagship | $1.59 | $1.73 | $1.93 | $1.73 |
| Gemini 3.1 Pro (preview) Google · Flagship · older or preview | $1.63 | $1.73 | $1.82 | $1.78 |
| Claude Sonnet 5.5 Anthropic · Mid | $2.20 | $3.14 | $3.83 | $2.93 |
| Claude Opus 5.5 Anthropic · Flagship | $4.40 | $6.28 | $7.65 | $5.86 |
| GPT-6 Astra OpenAI · Flagship | $7.50 | $8.57 | $9.78 | $8.12 |
| Claude Fable 5.1 Anthropic · Flagship | $11.01 | $15.71 | $19.13 | $14.65 |
Announced price changes are not included here: Gemini 4 Argon from 1 December 2026; Gemini 3.8 Flash from 1 January 2027. AiGanak Check applies them. The size of a job is an estimate; your own prompts and replies decide your bill. Quality on your task decides whether a cheaper model is usable.
Classify messages: questions
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Which AI model is cheapest for message classification?
For a typical job of 400 instruction tokens, 250 tokens read and 20 tokens written per message, the lowest-cost small-class model at list prices checked 9 November 2026 is GPT-6 Luna in English at $0.075 per 1,000 messages. Smaller models cost less but may not reach the quality this job needs.
Does message classification cost more in Hindi or Tamil?
Usually yes, because the same text takes more tokens. The lowest-cost small-class model is GPT-6 Luna in Hindi at $0.086 per 1,000 messages and GPT-6 Luna in Tamil at $0.098 per 1,000 messages, against $0.075 in English. Instructions stay in English in these figures.
How is the cost per message worked out?
Tokens read and written per message are multiplied by each model's list price per million tokens, using the measured token counts of that model family for each language (AiGanak token tax index, 4 November 2026). Caching, batch discounts and retries are not included; AiGanak Check lets you turn them on.
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Your real messages, priced on every model
The tables use a typical job. Your bill depends on your prompts, reply lengths and mix of languages. Send one month of usage and a sample of requests, and we price your actual traffic on every model and show the changes that are safe to make.
Delivered in two working days. If the savings identified come to less than USD 149 over three months, we refund what you paid.
Get an email when a price change affects these costs
We check OpenAI, Anthropic and Google pricing every week and email you the old price, the new price and the date.