For 10,000 requests of 2,000 tokens in and 500 out, GLM-5.3 Flash costs 40% less than GLM-5.3 FlashX on Zurelay: $2.65 against $4.40. Both are below their labs' list prices: 68% for GLM-5.3 FlashX and 50% for GLM-5.3 Flash.
Side by side
| GLM-5.3 FlashX | GLM-5.3 Flash | |
|---|---|---|
| Lab | Z.ai | Z.ai |
| Released | — | Aug 26, 2026 |
| Context window | 1M tokens | 1M tokens |
| Max output | 128K tokens | 128K tokens |
| Reads | Text, Images | Text |
| Reasoning levels | low, high, max | low, high, max |
| Price per 1M, in / out | $0.12 / $0.40 | $0.07 / $0.25 |
| Lab list price | $0.37 / $1.25 | $0.15 / $0.50 |
| Cached input per 1M | $0.024 | $0.014 |
| 10K typical requests | $4.40 | $2.65 |
Prices in US dollars per 1M tokens on Zurelay, live from the catalog. A typical request is 2,000 tokens in and 500 out. Output limits are each lab's.
What they're for
GLM-5.3 FlashX is Z.ai's high-speed version of GLM-5.3 Flash, its low-cost GLM for coding and agents. Z.ai says it runs at up to 200 tokens a second. The Zurelay GLM-5.3 FlashX API serves it through one OpenAI-compatible endpoint with a 1M-token context window, at 68% below Z.ai's list price.
GLM-5.3 Flash is Z.ai's low-cost GLM, with 18B of its 320B parameters active per token. Z.ai says it outperforms GLM-5.2 and approaches Claude Opus 4.8 on coding and agent benchmarks. The Zurelay GLM-5.3 Flash API serves it through one OpenAI-compatible endpoint with a 1M-token context window, at 50% below Z.ai's list price.
Try both
Specs don't say which model handles your work better. Send the same requests to both and compare the answers, the tokens and the bill. On Zurelay that's a change of model name.
To price a whole month, use the LLM cost calculator.
from openai import OpenAIclient = OpenAI(base_url="https://api.zurelay.com/v1", api_key="YOUR_ZURELAY_KEY")prompt = [{"role": "user", "content": "Summarize this contract: ..."}]# Same key, same code: only the model name changesfor model in ["glm-5.3-flashx", "glm-5.3-flash"]: reply = client.chat.completions.create(model=model, messages=prompt) print(model, reply.usage.total_tokens, reply.choices[0].message.content[:200])For 10,000 requests of 2,000 tokens in and 500 out, GLM-5.3 Flash costs 40% less than GLM-5.3 FlashX on Zurelay: $2.65 against $4.40. Per 1M tokens, GLM-5.3 FlashX is $0.12 input and $0.40 output, and GLM-5.3 Flash is $0.07 and $0.25.
They're the same on Zurelay: 1M tokens each.
Yes. One Zurelay key calls both. With an OpenAI SDK, point it at https://api.zurelay.com/v1 and change only the model name, glm-5.3-flashx or glm-5.3-flash, to switch.
Yes. Each model is served over several routes run by independent sellers, and every route is tested before it serves requests and every day after, with identity, dated-knowledge and reasoning checks that catch an older or different model sold under the name you asked for.
Create a key in seconds, point the SDK you already use at Zurelay, and every request costs up to 90% less from the first token.