How much does GLM-4.5-Flash cost per month?

For a chatbot handling 10,000 requests a day with 1,000 input and 500 output tokens each, GLM-4.5-Flash costs about $0 per month at Z.AI's list prices (free input, free output).

Does GLM-4.5-Flash support prompt caching?

Yes. Cached input costs Free per 1M tokens, compared with Free for regular input. Writing to the cache costs Free per 1M tokens.

How long is GLM-4.5-Flash's context window?

GLM-4.5-Flash accepts up to 131,072 tokens (131K) of context and returns up to 98,304 tokens per response.

GLM-4.5-Flash API Pricing

Z.AI · released Jul 28, 2025 · 131K context · API model ID glm-4.5-flash

GLM-4.5-Flash by Z.AI API pricing: free input and free output (provider list price via models.dev, Oct 10, 2026).

Prices

GLM-4.5-Flash prices, USD per 1M tokens
Price	USD per 1M tokens
Input	Free
Output	Free
Cache read	Free
Cache write	Free

Z.AI's list price for its own API, as compiled by models.dev and checked Oct 10, 2026, 09:00 UTC. Prices on cloud platforms and resellers can differ. Provider documentation

Estimated monthly cost

per month

per day: $0
per request: $0

Cost = input tokens × input price + output tokens × output price, 30 days a month. Cached input uses the cache read price. Cache write fees are not included.

Compare this workload across models

Monthly cost by workload

Workload	Per month
Chatbot1,000 in / 500 out tokens, 10,000 requests a day	$0/mo
RAG8,000 in / 500 out tokens, 5,000 requests a day	$0/mo
Coding agent50,000 in / 2,000 out tokens, 1,000 requests a day, 80% cached input	$0/mo

Context and capabilities

Context: 131,072 tokens
Max output: 98,304 tokens
Input: text
Output: text
Knowledge cutoff: April 2025
Open weights: Yes
Tool calling: Yes
Reasoning: Yes
Structured outputs: No

Capabilities and limits as listed by models.dev.

Similarly priced models

Claude Haiku 5.5 · $0.10 in / $0.50 out
GPT-6 Luna · $0.10 in / $0.50 out
Qwen3.8 Flash · $0.15 in / $0.47 out
DeepSeek V4.1 Flash · $0.30 in / $1.20 out

Price history

No price changes since we started tracking on Oct 8, 2026.

Questions

How much does GLM-4.5-Flash cost per month?: For a chatbot handling 10,000 requests a day with 1,000 input and 500 output tokens each, GLM-4.5-Flash costs about $0 per month at Z.AI's list prices (free input, free output).
Does GLM-4.5-Flash support prompt caching?: Yes. Cached input costs Free per 1M tokens, compared with Free for regular input. Writing to the cache costs Free per 1M tokens.
How long is GLM-4.5-Flash's context window?: GLM-4.5-Flash accepts up to 131,072 tokens (131K) of context and returns up to 98,304 tokens per response.