GLM-5.3-FlashX

GLM-5.3-FlashX is the high-speed serving option for Z.AI's natively multimodal GLM-5.3-Flash weights, aimed at latency-sensitive coding and agent loops.

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input · usd / 1m tok

$0.37

output · usd / 1m tok

$1.25

context window

1mtokens

modalities · in → out

pricing

base api ratesusd per 1m tokens

input: $0.37
output: $1.25
cache read: $0.075

providers

Z.AI hosts GLM-5.3-FlashX. Impossibl routes your request intelligently and handles failover automatically when a provider is down.

Z.AI

specifications

takes text and image in, gives text outzai/glm-5.3-flashx

creatorZ.AI
model typeText generation
context window1,000,000 tokens
maximum outputnot published
input
takes text and image in, gives text out
outputtext
tool callingnot verified
endpoint/v1/chat/completions

unknown means the public catalog does not establish that fact. a model's documented capabilities can differ from what a particular api supports. see the model documentation for integration details.

try it · your prompt, this model, live

# responses API
import os
from openai import OpenAI

client = OpenAI(
    api_key=os.environ["IMPOSSIBL_API_KEY"],
    base_url="https://api.impossibl.com/v1",
)

resp = client.responses.create(
    model="zai/glm-5.3-flashx",
    input="▌",
)
print(resp.output_text)

edit the prompt, then run

# responses API
import os
from openai import OpenAI

client = OpenAI(
    api_key=os.environ["IMPOSSIBL_API_KEY"],
    base_url="https://api.impossibl.com/v1",
)

resp = client.responses.create(
    model="zai/glm-5.3-flashx",
    input="▌",
)
print(resp.output_text)

edit the prompt, then run

benchmarks

benchmark results are not available for this model yet.

compare GLM-5.3-FlashX with other models

frontier labs and open weights, best-ranked firstusd / 1m tok · in / out

anthropic/claude-fable-5-1$10.00 / $50.00compare →
openai/gpt-6-astra$10.00 / $50.00compare →
meta/muse-spark-1.3$1.25 / $4.25compare →
moonshotai/kimi-k3$3.00 / $15.00compare →

impossibl models --all →

frequently asked questions

What is GLM-5.3-FlashX?

GLM-5.3-FlashX is the high-speed serving option for Z.AI's natively multimodal GLM-5.3-Flash weights, aimed at latency-sensitive coding and agent loops. It keeps the same always-on thinking, tool calling, and visual understanding of interfaces and rendered output as its Flash sibling, trading a higher rate for faster responses.

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 through the Impossibl API. Cache reads cost $0.075 per million tokens. All rates are in USD.

view the pricing table ↑

What is the context length of GLM-5.3-FlashX?

GLM-5.3-FlashX has a 1,000,000-token context window through the Impossibl API.

What inputs and outputs does GLM-5.3-FlashX support?

GLM-5.3-FlashX accepts text and image as input. GLM-5.3-FlashX returns text.

How do I use GLM-5.3-FlashX through an API?

GLM-5.3-FlashX is available through the Impossibl API. Use zai/glm-5.3-flashx as the model identifier with /v1/chat/completions. The quickstart explains how to create an API key and send your first request.

follow the api quickstart →

this page describes GLM-5.3-FlashX as listed by the impossibl public api. prices and availability come from that catalog, refreshed here every five minutes. this is an impossibl offering, not a comparison of independent hosting-provider quotes. model descriptions and release dates, where available, use the creator sources linked under the answers above.

view the source catalog ↗model as markdown ↗report a correction →