Processing or generating 50,000 words (approximately 64,000 tokens) with o3 (Reasoning Frontier) ranges from $0.064 (cached input) to $2.56 (full generation).
Quick answer
For 50,000 words, o3 (Reasoning Frontier) processes approximately 64,000 tokens. That costs $0.64 as uncached input, $0.064 with the modeled cache discount, or $2.56 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 50,000 words as prompt context, documentation, or background knowledge.
o3 (Reasoning Frontier) 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 |
|---|---|---|---|---|---|
| o3 (Reasoning Frontier) (Current) | openai | $0.64 | $0.064 | $2.56 | 1,050,000 |
| GPT-5.6 Sol | openai | $0.32 | $0.032 | $1.92 | 1,050,000 |
| GPT-5.6 Cyber | openai | $0.80 | $0.08 | $4.80 | 1,050,000 |
| GPT-5.5 Standard | openai | $0.32 | $0.032 | $1.92 | 512,000 |
| GPT-5.5 Pro | openai | $1.92 | $0.192 | $11.52 | 512,000 |
| o3-pro (Frontier Reasoning) | openai | $1.28 | $0.128 | $5.12 | 1,000,000 |
For o3 (Reasoning Frontier) (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 $0.64 (or $0.064 with prompt caching). Generating 50,000 words as output costs $2.56. 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 $0.064). For non-urgent asynchronous batch processing, 24-hour batch queues provide a flat 50% discount across all tokens (costing $0.32 for input, $1.28 for output).
At an average human reading speed of 250 words per minute, 50,000 words takes approximately 200 minutes to read. In contrast, o3 (Reasoning Frontier) can process or generate this text in seconds.