Processing or generating 1,000,000 words (approximately 1,280,000 tokens) with OpenRouter Auto-Best Router ranges from $0.32 (cached input) to $3.84 (full generation).
Quick answer
For 1,000,000 words, OpenRouter Auto-Best Router processes approximately 1,280,000 tokens. That costs $1.28 as uncached input, $0.32 with the modeled cache discount, or $3.84 when generated as output.
Method & trust
The estimate converts the selected English word count with the model tokenizer family, then applies the published input/output price per million tokens. Real prompts vary with code, formatting, language, and system instructions.
You send 1,000,000 words as prompt context, documentation, or background knowledge.
OpenRouter Auto-Best Router drafts a complete 1,000,000 words article, chapter, or code module.
800,000 words input prompt + 200,000 words output reply.
| Model | Provider | Input Cost (1,000,000 words) | Cached Input Cost | Output Cost (1,000,000 words) | Context Limit |
|---|---|---|---|---|---|
| OpenRouter Auto-Best Router (Current) | openrouter | $1.28 | $0.32 | $3.84 | 1,000,000 |
| GPT-5.6 Terra | openai | $2.56 | $0.256 | $15.36 | 1,050,000 |
| GPT-5.4 Workhorse | openai | $3.20 | $0.32 | $19.20 | 256,000 |
| o3-mini | openai | $1.408 | $0.704 | $5.632 | 200,000 |
| o4-mini | openai | $1.408 | $0.352 | $5.632 | 256,000 |
| o1-mini | openai | $1.408 | $0.704 | $5.632 | 128,000 |
For OpenRouter Auto-Best Router (o200k_base tokenizer), 1,000,000 words is approximately 1,280,000 tokens (an average ratio of 1.28 tokens per word in English). Code, technical vocabulary, and non-English scripts will have higher token densities.
Sending 1,000,000 words as input costs $1.28 (or $0.32 with prompt caching). Generating 1,000,000 words as output costs $3.84. Output tokens are more expensive because autoregressive token generation requires significantly more computation per token.
Yes! If your input text is part of a repeated context, prompt caching saves 50% to 90% (costing $0.32). For non-urgent asynchronous batch processing, 24-hour batch queues provide a flat 50% discount across all tokens (costing $0.64 for input, $1.92 for output).
At an average human reading speed of 250 words per minute, 1,000,000 words takes approximately 4000 minutes to read. In contrast, OpenRouter Auto-Best Router can process or generate this text in seconds.