Processing or generating 50,000 words (approximately 64,000 tokens) with GPT-5.6 Luna ranges from $0.00128 (cached input) to $0.0768 (full generation).
You send 50,000 words as prompt context, documentation, or background knowledge.
GPT-5.6 Luna drafts a complete 50,000 words article, chapter, or code module.
40,000 words input prompt + 10,000 words output reply.
| Model | Provider | Input Cost (50,000 words) | Cached Input Cost | Output Cost (50,000 words) | Context Limit |
|---|---|---|---|---|---|
| GPT-5.6 Luna (Current) | openai | $0.0128 | $0.00128 | $0.0768 | 1,050,000 |
| GPT-5.4 mini | openai | $0.048 | $0.0048 | $0.288 | 256,000 |
| GPT-5.4 nano | openai | $0.0128 | $0.00128 | $0.08 | 128,000 |
| GPT-4o mini | openai | $0.0096 | $0.0048 | $0.0384 | 128,000 |
| Claude Haiku 4.5 | anthropic | $0.066 | $0.0066 | $0.33 | 1,000,000 |
| Claude 3.5 Haiku | anthropic | $0.0528 | $0.00528 | $0.264 | 200,000 |
For GPT-5.6 Luna (o200k_base tokenizer), 50,000 words is approximately 64,000 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 50,000 words as input costs $0.0128 (or $0.00128 with prompt caching). Generating 50,000 words as output costs $0.0768. 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 $0.00128). For non-urgent asynchronous batch processing, 24-hour batch queues provide a flat 50% discount across all tokens (costing $0.0064 for input, $0.0384 for output).
At an average human reading speed of 250 words per minute, 50,000 words takes approximately 200 minutes to read. In contrast, GPT-5.6 Luna can process or generate this text in seconds.