Token Calculation

Tokens = words + special characters + overhead.

Quick Estimate

1 token ≈ 4 characters in English

1 token ≈ 1-2 characters in Chinese

1 token ≈ 0.75 words in English

Total Cost = (Input Tokens × Input Price) + (Output Tokens × Output Price)

Use `ga-economy` or `Qwen/Qwen3-8B` for simple tasks (free or cheaper)

Set `max_tokens` to avoid runaway outputs

Include all `messages` history in context cost

For long conversations, summarize older messages