Processing or generating 5,000 words (approximately 6,400 tokens) with o3-pro (Frontier Reasoning) ranges from $0.0128 (cached input) to $0.512 (full generation).
Quick answer
For 5,000 words, o3-pro (Frontier Reasoning) processes approximately 6,400 tokens. That costs $0.128 as uncached input, $0.0128 with the modeled cache discount, or $0.512 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 5,000 words as prompt context, documentation, or background knowledge.
o3-pro (Frontier Reasoning) drafts a complete 5,000 words article, chapter, or code module.
4,000 words input prompt + 1,000 words output reply.
| Model | Provider | Input Cost (5,000 words) | Cached Input Cost | Output Cost (5,000 words) | Context Limit |
|---|---|---|---|---|---|
| o3-pro (Frontier Reasoning) (Current) | openai | $0.128 | $0.0128 | $0.512 | 1,000,000 |
| GPT-5.6 Sol | openai | $0.032 | $0.0032 | $0.192 | 1,050,000 |
| GPT-5.6 Cyber | openai | $0.08 | $0.008 | $0.48 | 1,050,000 |
| GPT-5.5 Standard | openai | $0.032 | $0.0032 | $0.192 | 512,000 |
| GPT-5.5 Pro | openai | $0.192 | $0.0192 | $1.152 | 512,000 |
| o3 (Reasoning Frontier) | openai | $0.064 | $0.0064 | $0.256 | 1,050,000 |
For o3-pro (Frontier Reasoning) (o200k_base tokenizer), 5,000 words is approximately 6,400 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 5,000 words as input costs $0.128 (or $0.0128 with prompt caching). Generating 5,000 words as output costs $0.512. 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 $0.0128). For non-urgent asynchronous batch processing, 24-hour batch queues provide a flat 50% discount across all tokens (costing $0.064 for input, $0.256 for output).
At an average human reading speed of 250 words per minute, 5,000 words takes approximately 20 minutes to read. In contrast, o3-pro (Frontier Reasoning) can process or generate this text in seconds.