GLM-5.3-FlashX-Legal

GLM-5.3-FlashX-Legal is Z.AI's legal-domain variant of GLM-5.3-FlashX, a natively multimodal model given additional legal mid-training and post-training.

start building →

compare models

          .. .. ..... . .  .........             .. .. .   ..  ... .. ... . .
        .:+****+**+*+****+*+*++++*+++++-.      .:+++++++++++++++++++++++-++++-:.
       .-=@@@@@@@@@@@@#@####@@@@@@@#@@%+.    .:+%@@@@@%@@%@@%@%@%%@%%@%@%%@%%*.
      .-%###@####@@@###@####@@@@@##@@@+..   .:*%@@@@@@@@@@@@@@@@@@@@@@%@@%%%+:
     .+%######@#@##@@@@###@#@#####@@%-..   .-=@@@#@@@@@@@@@@@@@@@@@@@@@%%%=+..
   .:*@#@#############@###@@@####@@=:.    .-%@@@@@@@@@@@@@@@@@@@@@@@@%@@%=-.
   :*@@@####@#@#@@@@@@##@@##@@@@@@*:.   ..+%@@@@@@@@@@@@@@@@@@@%@@%@@%@%*:.
   :+*************************+*+-..    :+%@@@@@@@@@@@@@@@@@@@@@@@@@%%%*:.
    ... ..... .... ...... ... . . .   .-=@@@@@@@@@@@@@@@@@%@%@@@@@%%%%-.
                                    ..:=@@@@@@@@@@@@@@@@@@@@%%@%@@%%=-..
                                    .-%@@@@@@@@@@@@@@@@@@@%@@@%%%%%=:.
                                  .:+%@@@@@@@@@@@@@@@@@@@@@@@%@@%%*:.
                                ..:*@@@@@@@@@@@@@@@@@@@@@%@%%%%%%+:.
                                .-=%@@@@@@@@@@@@@@@@@%%@@%@@@%%=-..
                              ..-=@@@@@@@@@@@@@@@@@@@@@@@%@%%%=-..
                              :+%@@@@@@@@@@@@@@%%@@@%%%@@@%%%*:.
                            .:*%@@@@@@@@@@@@@@@@@@%%%%%@@@%%*:.
                          ..:=%@@@@@@@@@@@@@@@@@@@@@%%%%@%=+..
                          .:=@@@@@@@@@@@@@@@%@%@@@@%@@@%%=-.
                        ..-%@@@@@@@@@@@@@@@@@%%@%%@@%@%%*:.
                       .:+%@@@@@@@@@@@@@@@%%%%@@%@@@%%%*:.
                       :*%@@@@@@@@@@@@@%@@%%%@@%@%%%%%+..
                     .:=@@@@@@@@@@@@@@@@@%@%@@@@%@%%=-..
                    .-%@@@@@@@@@@@@@@@%%%@@%%@%@%%%*-.
                  .:+%%@@@@@@@@@@@@@%%%%%%@%@%%%%%*:.
                 .:*%@@@@@@@@@%@%@%%@@@@%@%%@%%%=+:.
                .:=%@@@@@@@@@%@@@@@@@%@%@%%@%%%=+.
               .-=@@@@@@@@@@@@@@%%@%%%%@@%%%%%=-..
             .:+%@@@@@@@@@@@%@%%@%%@%%@@%%%%%*:.
            .:*%@@@@@@@@@@@%@%%@@@%%%%%@%%%%+..
           .:*%@@@@@@@@@@@@%@@%%@%@@@%%@%%%+:
          .-=%@@@@@@@@@@@@@@@%%@%%%%%%%%%=-..
         :-%%@@@@@@@@@@%@%%@@@%%%%%%@@%%=:..
       .:+%@@@@@@@@@@@@@%@@%%%%@%%%%%%=*:..    . .. .. .   .    .     .  ..
      .:*%@@@@@@@@@@%@@@@%@%%@%%@%%%%=+.     .---+--+-+-+-----------------::
     .-*%%@@@@@@@@%@%@%%@%@@%@%%%%%%=-..    .+==================*=*===*=**+:.
   ..-=@@@@@@@@%%%@%%%@%@%%%%%%%%%==-.   ..:*==%%=%%==================***+...
  .:-%%@@@@@@@@%%%@@%%%@%%%%%%%%%=*:.    .-*==%==%%===%==========*===***+.
 .:+%@@@@@@@@%%%@@%@%%%@%%%%%%%%=+.    ..-=%%%=%================*==*=**-..
 .+%%%%%%@@%%@@%%%%%%%%%%%=%%%%=+.     .-============*====***==******+:..
.:-++++++-++++++-+--+-+------+-:..     .------------:---:--:--:-:::::..
      ...  .   ..   .     .              .          .. ..  ..      .

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-Legal. 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-legal

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
releasedoct 29, 2026
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-legal",
    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-legal",
    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-Legal with other models

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

anthropic/claude-opus-5-5$4.00 / $20.00compare →
openai/gpt-6-astra$10.00 / $50.00compare →
moonshotai/kimi-k3.1-pro$2.00 / $10.00compare →
meta/muse-wonder$4.00 / $20.00compare →

impossibl models --all →

frequently asked questions

What is GLM-5.3-FlashX-Legal?

GLM-5.3-FlashX-Legal is Z.AI's legal-domain variant of GLM-5.3-FlashX, a natively multimodal model given additional legal mid-training and post-training. It targets legal research, contract review, cross-document checks and drafting, typically inside agent setups connected to legal data and document-editing tools.

How much does GLM-5.3-FlashX-Legal cost?

GLM-5.3-FlashX-Legal 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-Legal?

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

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

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

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

GLM-5.3-FlashX-Legal is available through the Impossibl API. Use zai/glm-5.3-flashx-legal 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 →

When was GLM-5.3-FlashX-Legal released?

Z.AI released GLM-5.3-FlashX-Legal on October 29, 2026.

Creator release announcement ↗

this page describes GLM-5.3-FlashX-Legal 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 →