Z.ai · Model
GLM 5.3 FlashX pricing, context window and specs
GLM 5.3 FlashX costs $0.37 per million input tokens and $1.25 per million output tokens, and reads up to 1,048,576 tokens per request. By blended price it is number 3 of Z.ai’s 7 current models here, counting from the cheapest.
- Input / 1M
- $0.37
- Output / 1M
- $1.25
- Cached / 1M
- $0.09
- Context
- 1,048,576
- Max output
- 131,072
- Released
- 2026-09-18
Estimate your cost with GLM 5.3 FlashXCompare all Z.ai modelsCount tokens for GLM 5.3 FlashX
Pricing
GLM 5.3 FlashX API pricing
| Price per 1M tokens | Input | Output |
|---|---|---|
| Standard | $0.37 | $1.25 |
| Cached input (read) | $0.09 | – |
Output costs 3.4× the input price, so long replies drive the bill more than long prompts. If your requests share a long fixed prefix, such as a system prompt or tool definitions, caching cuts that part to 24% of the normal input price.
Examples
What GLM 5.3 FlashX costs in practice
| Workload | Tokens in / out | Requests/day | Per request | Per month |
|---|---|---|---|---|
| Support chatbot50% cached | 1,500 / 400 | 1,000 | $0.000845 | $25.70 |
| RAG app20% cached | 6,000 / 500 | 500 | $0.00251 | $38.16 |
| Coding agent80% cached | 40,000 / 2,000 | 200 | $0.00834 | $50.73 |
| Document summariser | 8,000 / 600 | 300 | $0.00371 | $33.85 |
Change any number in the cost calculator.
Context
Context window
GLM 5.3 FlashX accepts up to 1,048,576 tokens per request, roughly 786,432 English words or 1,573 pages. That budget is shared between your prompt and the reply, and a single reply is capped at 131,072 tokens.
Filling the whole window with one prompt costs about $0.39 at list price, so for repeated long-document work, retrieval (sending only the relevant parts) or prompt caching is usually much cheaper.
Features
Capabilities
- Image input
- Yes
- Tool / function calling
- Yes
- Reasoning mode
- Yes
- Prompt caching
- Yes
- Structured output
- No
- Open weights
- No
- Accepts
- text, image, video
- Knowledge cutoff
- Not published
As declared by the provider’s API. It shows a feature exists, not how well it works.
API
GLM 5.3 FlashX model ID
- OpenRouter
z-ai/glm-5.3-flashx
Use the OpenRouter ID when calling it through OpenRouter; Z.ai’s own API may name it differently. See the model ID reference for the providers we document.
Z.ai
Where GLM 5.3 FlashX sits in Z.ai’s line-up
Ranked by blended price (three parts input to one part output, $0.59 per 1M for GLM 5.3 FlashX), it is number 3 of Z.ai’s 7 current models here, counting from the cheapest. One step down, GLM 4.6V costs $0.45 blended (24% less). Unlike GLM 5.3 FlashX, it reads up to 131,072 tokens (1,048,576 here), caps a reply at 32,768 tokens (131,072 here) and has open weights. One step up, GLM 5 Turbo costs $1.90 (3.2× as much). Unlike GLM 5.3 FlashX, it doesn’t accept images or video and reads up to 202,752 tokens (1,048,576 here). See every Z.ai model and price
| Model | Input / 1M | Output / 1M | Context | Released |
|---|---|---|---|---|
| GLM 5.3 Flash | $0.15 | $0.50 | 1,048,575 | 2026-08-26 |
| GLM 4.6V | $0.30 | $0.90 | 131,072 | 2025-12-08 |
| GLM 5.3 FlashX (this page) | $0.37 | $1.25 | 1,048,576 | 2026-09-18 |
| GLM 5 Turbo | $1.20 | $4 | 202,752 | 2026-03-15 |
| GLM 5V Turbo | $1.20 | $4 | 202,752 | 2026-04-01 |
| GLM 5.3 | $1.40 | $4.40 | 1,048,576 | 2026-08-18 |
| GLM 5.3 Prime | $2.80 | $8.80 | 1,000,000 | 2026-09-23 |
Z.ai’s current models with a page here, cheapest first. Older and superseded models are listed on the provider page and in the comparison table.
Save
Cheaper alternatives
- Qwen3.5-9BQwen81% cheaper
- Seed 1.6 FlashByteDance Seed78% cheaper
- GPT-6 LunaOpenAI66% cheaper
- Claude Haiku 5.5Anthropic66% cheaper
- GLM 4.6VZ.ai24% cheaper
Current models from major providers, one per provider, that keep image input, tool calling, a reasoning mode, a usable context window and output limit. Compared by blended price.
Compare
Similarly priced models
- Command A+Cohere$0.30 / $1.50
- Qwen3.7 PlusQwen$0.32 / $1.28
- Muse Glimmer 30BMeta$0.30 / $1.20
- DeepSeek V4.1 FlashDeepSeek$0.30 / $1.20
- MiniMax M3MiniMax$0.30 / $1.20
Current models from other major providers, closest blended price.
FAQ
GLM 5.3 FlashX questions
How much does GLM 5.3 FlashX cost?
GLM 5.3 FlashX costs $0.37 per million input tokens and $1.25 per million output tokens, with cached input at $0.09. A typical chatbot reply (1,500 tokens in, 400 out) costs about $0.00106. Use the LLM cost calculator for your own workload.
What is GLM 5.3 FlashX’s context window?
1,048,576 tokens, about 786,432 English words or 1,573 printed pages, shared between your prompt and the reply. A single reply can be up to 131,072 tokens.
Does GLM 5.3 FlashX support prompt caching and batch requests?
Yes, cached input is billed at $0.09 per million tokens (24% of the normal input price). No batch price is published for it.
What are cheaper alternatives to GLM 5.3 FlashX?
With the same essentials (image input and tool calling), the cheapest options are Qwen3.5-9B (81% cheaper), Seed 1.6 Flash (78% cheaper), GPT-6 Luna (66% cheaper). Cheaper doesn’t mean equivalent, so test them on your own prompts.
What is the API model ID for GLM 5.3 FlashX?
On OpenRouter it is z-ai/glm-5.3-flashx. Z.ai’s own API may use a different name, so check its model list before you deploy. Pass the ID as the model value in each request.
Is GLM 5.3 FlashX open source?
No, GLM 5.3 FlashX is only available through Z.ai’s API and partners; its weights aren’t published.