GLM 5.3 FlashX
Z.ai · released Sep 18, 2026
- Type
- Closed
- Input
- $0.37
- Output
- $1.25
- Cached
- $0.090
List price · per 1M tokens · Z.AI at 1M context · source ↗
Our take
Written Sep 30, 2026GLM 5.3 FlashX is a hosted-only model: we list no download for it, so using it means choosing a host. Nothing here measures its quality, so treat it as a candidate to trial on work you can check yourself rather than a proven pick.
Reach for it when a long document, or a question with a screenshot or a clip attached, can go to a host in one request and the bill matters more than measured quality. Two hosts serve it, so you can move the workload if one changes its terms. Skip it if you need evidence of coding, reasoning or chat quality before committing, or if you meant to run the model on your own machine.
The case for it
- Long documents go in whole rather than being split up first, though reliable recall across all of it is unverified in our data.
- Images and video go into the same request as the text, so a clip does not have to be described in words first.
The case against it
- No benchmark scores are supplied, so chat, coding and reasoning ability all need a trial on work you can judge yourself.
- We list no download for it, so a host is the only route we can point you to.
How good is it?
We hold no score for this model.
So there is no figure here for everyday use, coding, agent work or writing. That is a gap in our data, not a low score.
Where to rent it
Prices checked between 55 min and 58 min ago — each listing carries its own date.
Why this differs from the header. The strip above quotes Z.AI's own list price; this is the cheapest live offer, whoever is serving it — a reseller undercutting a lab is ordinary commerce, not an error.
- per 1M tokens
- $0.37 in / $1.25 out
- Context served
- 1M
- Throughput
- Not measured
| Provider | In / out per 1M tokens | Context | Throughput | Trains on prompts | Logs prompts | Zero retention |
|---|---|---|---|---|---|---|
| OpenRouterOpenRouter's own listing | $0.37 / $1.25checked 58 min ago | 1M | not measured | Unknown | Unknown | Unknown |
| Z.AIfp8Through OpenRouter | $0.37 / $1.25checked 55 min ago | 1M131K max reply | 50 tok/s | No | No | Confirmed |
Across the 2 listings we hold: 1 says it does not train on prompts, 0 say they do and 1 does not say. 1 appears in the zero-retention registry we check; the rest are unknown to us.
What each host's API supports
From the parameter list each endpoint publishes. Streaming is omitted: nothing we hold reports it, for any model.
| Provider | Tool calling | JSON output | Strict schema |
|---|---|---|---|
| OpenRouterOpenRouter's own listing | ✓ | ✓ | ✗ |
| Z.AIfp8Through OpenRouter | ✓ | ✓ | ✗ |
Tool calling: 2 of 2 listings say yes. JSON output: 2 of 2 listings say yes. Strict schema: 0 of 2 listings say yes, 2 say no.
When we formed this view
Recent changes
What moved
first indexed by our pipelineEach date is the day we first saw the change, or the day the maker announced it.
What we do not know about this model yet
- No independent board has scored it, so we hold no quality figures at all.
- Nothing we hold says whether an endpoint streams, so we do not show it either way.
- 1 of 2 listings does not say whether it trains on prompts.
- We hold no batch or off-peak rate for any of its listings.
Licence and identifiers
What the licence allowsWe hold no licence record for this model. Inside are the identifiers you need to pull it — its Hugging Face repo where we have one, our slug and a machine-readable card.
Licence
We hold no licence record for this model, and no record of published weights either — so we can neither summarise its terms nor point you at the weights.
Identifiers
- Takes in, gives back
- Text, images and video in, text out
- Catalogue slug
- z-ai-glm-5-3-flashx