Processing or generating 2,500 words (approximately 3,200 tokens) with o3 (Reasoning Frontier) ranges from $0.0032 (cached input) to $0.128 (full generation).
You send 2,500 words as prompt context, documentation, or background knowledge.
o3 (Reasoning Frontier) drafts a complete 2,500 words article, chapter, or code module.
2,000 words input prompt + 500 words output reply.
| Model | Provider | Input Cost (2,500 words) | Cached Input Cost | Output Cost (2,500 words) | Context Limit |
|---|---|---|---|---|---|
| o3 (Reasoning Frontier) (Current) | openai | $0.032 | $0.0032 | $0.128 | 1,050,000 |
| GPT-5.6 Sol | openai | $0.016 | $0.0016 | $0.096 | 1,050,000 |
| GPT-5.6 Cyber | openai | $0.04 | $0.004 | $0.24 | 1,050,000 |
| GPT-5.5 Standard | openai | $0.016 | $0.0016 | $0.096 | 512,000 |
| GPT-5.5 Pro | openai | $0.096 | $0.0096 | $0.576 | 512,000 |
| o3-pro (Frontier Reasoning) | openai | $0.064 | $0.0064 | $0.256 | 1,000,000 |
For o3 (Reasoning Frontier) (o200k_base tokenizer), 2,500 words is approximately 3,200 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 2,500 words as input costs $0.032 (or $0.0032 with prompt caching). Generating 2,500 words as output costs $0.128. 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 $0.0032). For non-urgent asynchronous batch processing, 24-hour batch queues provide a flat 50% discount across all tokens (costing $0.016 for input, $0.064 for output).
At an average human reading speed of 250 words per minute, 2,500 words takes approximately 10 minutes to read. In contrast, o3 (Reasoning Frontier) can process or generate this text in seconds.