AiGanakWhat Indonesian costs on LLM APIs
The same customer messages take 1.10× to 1.80× as many tokens in Indonesian as in English, depending on the model, and API bills follow tokens. Gemini 4 Argon counts the fewest tokens for Indonesian; Claude 5.x the most.
The same 12 business messages take 1.28× on OpenAI GPT-6, 1.80× on Claude 5.x, 1.13× on Gemini 3.x, 1.10× on Gemini 4 Argon as many tokens in Indonesian as in English (official token counters, 4 November 2026), so they cost that many times as much. Gemini 4 Argon uses the fewest tokens for Indonesian, Claude 5.x the most. Cheapest listed model for 100,000 messages and replies a month: GPT-6 Luna at $1.77, against $1.38 in English on the same model (list prices checked 2 November 2026).
Indonesian against English, by model family
1.00× = English on the same model. Tokens are what you are billed for, so 2.00× means the same conversation costs twice as much.
| Model family | Indonesian tokens | English tokens | Multiple of English | Indonesian tokens per message |
|---|---|---|---|---|
| OpenAI GPT-6 | 354 | 276 | 1.28× | 29.5 |
| Claude 5.x | 730 | 405 | 1.80× | 60.8 |
| Gemini 3.x | 331 | 292 | 1.13× | 27.6 |
| Gemini 4 Argon | 322 | 292 | 1.10× | 26.8 |
Models counted together: OpenAI GPT-6: gpt-6-astra, gpt-6.1-sol, gpt-6.1-terra, gpt-6-luna; Claude 5.x: claude-opus-5-5, claude-sonnet-5-5, claude-haiku-5-5, claude-fable-5-1; Gemini 3.x: gemini-3.1-pro-preview, gemini-3.8-flash, gemini-3.5-flash-lite; Gemini 4 Argon: gemini-4-argon. Corpus, counts and counting script are open on GitHub under CC BY 4.0. Native-speaker corrections are welcome.
Indonesian in the index
- On Claude 5.x, Indonesian takes 2.27× as many tokens as on Gemini 4 Argon for the same text, the widest gap between model families for this language.
- Rank among the 22 languages measured (1 = most tokens): 16th on OpenAI GPT-6, 14th on Claude 5.x, 20th on Gemini 3.x, 20th on Gemini 4 Argon.
- On Gemini 4 Argon, the most token-efficient family for Indonesian, Indonesian takes 1.10× English against an average of 1.07× for the other 4 Asian and Middle Eastern languages in the index.
Monthly cost of 100,000 messages in Indonesian
Each message goes in once and gets a reply of the same length, at each model's standard input and output list price, no caching. The cheapest listed model for Indonesian is GPT-6 Luna at $1.77 a month.
| Model | In Indonesian | In English |
|---|---|---|
| GPT-6 Luna OpenAI | $1.77 | $1.38 |
| Claude Haiku 5.5 Anthropic | $3.65 | $2.03 |
| Gemini 3.5 Flash-Lite Google | $7.72 | $6.81 |
| Gemini 3.8 Flash Google | $12.41 | $10.95 |
| GPT-6.1 Terra OpenAI | $17.70 | $13.80 |
| Gemini 4 Argon Google | $32.20 | $29.20 |
| GPT-6.1 Sol OpenAI | $35.40 | $27.60 |
| Gemini 3.1 Pro (preview) Google | $38.62 | $34.07 |
| Claude Sonnet 5.5 Anthropic | $73.00 | $40.50 |
| Claude Opus 5.5 Anthropic | $146.00 | $81.00 |
| GPT-6 Astra OpenAI | $177.00 | $138.00 |
| Claude Fable 5.1 Anthropic | $365.00 | $202.50 |
Price per token and tokens per message both matter, and quality on your own task decides whether a cheaper model is usable. Gemini 4 Argon's announced price rise from 1 December 2026 is not included; see the price changes log.
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Indonesian LLM cost: questions
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Does Indonesian cost more than English on LLM APIs?
Yes. In AiGanak's measurement with official token counters (4 November 2026), the same 12 business messages took 1.28× on OpenAI GPT-6, 1.80× on Claude 5.x, 1.13× on Gemini 3.x, 1.10× on Gemini 4 Argon as many tokens in Indonesian as in English, and API bills follow tokens.
Which LLM is cheapest for Indonesian?
Gemini 4 Argon used the fewest tokens for Indonesian in our test. Counting price as well, the cheapest listed model for 100,000 messages and same-length replies a month is GPT-6 Luna at $1.77, against $1.38 for English on the same model (list prices checked 2 November 2026). Test quality on your own examples before choosing.
How can I reduce LLM costs for Indonesian users?
Compare model families, because Claude 5.x counts the most tokens for Indonesian. Keep system prompts and tool definitions in English, cache the fixed part of the prompt, and at high volume consider a small model with a tokenizer trained for your language.
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