Processing or generating 500,000 words (approximately 666,500 tokens) with GLM-4.5-Flash (Z.ai) ranges from $0.00 (cached input) to $0.00 (full generation).
Quick answer
For 500,000 words, GLM-4.5-Flash (Z.ai) processes approximately 666,500 tokens. That costs $0.00 as uncached input, $0.00 with the modeled cache discount, or $0.00 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 500,000 words as prompt context, documentation, or background knowledge.
GLM-4.5-Flash (Z.ai) drafts a complete 500,000 words article, chapter, or code module.
400,000 words input prompt + 100,000 words output reply.
| Model | Provider | Input Cost (500,000 words) | Cached Input Cost | Output Cost (500,000 words) | Context Limit |
|---|---|---|---|---|---|
| GLM-4.5-Flash (Z.ai) (Current) | zai | $0.00 | $0.00 | $0.00 | 200,000 |
| GPT-5.6 Luna | openai | $0.128 | $0.0128 | $0.768 | 1,050,000 |
| GPT-5.4 mini | openai | $0.48 | $0.048 | $2.88 | 256,000 |
| GPT-5.4 nano | openai | $0.128 | $0.0128 | $0.80 | 128,000 |
| GPT-4o mini | openai | $0.096 | $0.048 | $0.384 | 128,000 |
| Claude Haiku 4.5 | anthropic | $0.66 | $0.066 | $3.30 | 1,000,000 |
For GLM-4.5-Flash (Z.ai) (glm_bpe tokenizer), 500,000 words is approximately 666,500 tokens (an average ratio of 1.33 tokens per word in English). Code, technical vocabulary, and non-English scripts will have higher token densities.
Sending 500,000 words as input costs $0.00 (or $0.00 with prompt caching). Generating 500,000 words as output costs $0.00. 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 $0.00). For non-urgent asynchronous batch processing, 24-hour batch queues provide a flat 50% discount across all tokens (costing $0.00 for input, $0.00 for output).
At an average human reading speed of 250 words per minute, 500,000 words takes approximately 2000 minutes to read. In contrast, GLM-4.5-Flash (Z.ai) can process or generate this text in seconds.