GLM-5.2

GLM-5.2 is Z.AI's flagship foundation model for long-horizon engineering, from project-level codebase takeover and large refactors to deep debugging and research reproduction.

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input · usd / 1m tok

$1.40

output · usd / 1m tok

$4.40

context window

1mtokens

modalities · in → out

pricing

base api ratesusd per 1m tokens

input: $1.40
output: $4.40
cache read: $0.26

providers

Different companies host GLM-5.2. Impossibl routes your request intelligently and handles failover automatically when a provider is down.

Azure AI Foundry
Azure AI Foundry serving options
endpoint location routes
East US 2 1
East US 1
locations describe provider endpoints; they do not guarantee where inference runs.
Z.AI

Azure AI Foundry serving options
endpoint location	routes
East US 2	1
East US	1

specifications

takes text in, gives text outzai/glm-5.2

creatorZ.AI
model typeText generation
context window1,000,000 tokens
maximum outputnot published
input
takes text in, gives text out
outputtext
tool callingnot verified
releasedjun 16, 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-5.2",
    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-5.2",
    input="▌",
)
print(resp.output_text)

edit the prompt, then run

benchmarks

intelligence index

33.7#42 of 108 models on the gateway

coding index68.8#27 of 64
agentic index38.4#25 of 53
omniscience4.4#28 of 84
gpqa89.5%#30 of 80
humanity’s last exam41.1%#22 of 87

Tau299.1%
GPQA89.5%
AA-LCR78.3%
IFBench73.3%
SciCode51.2%
Terminal-Bench Hard50.8%
ITBench42.7%
Humanity’s Last Exam41.1%
Tau Banking34.6%
APEX-Agents33.7%
AutomationBench Partial28.4%
CritPt20.9%
GDP.pdf All-pass10.4%
Multilingual LCR7.2%

Intelligence Index33.71
Omniscience Index4.43
GDPval Elo1371.43
legal index (API)34.3
coding index (API)68.8
agentic index (API)38.4
economics index (API)45.6
engineering index (API)37.2
intelligence index (API)33.7
strategy and ops index (API)30.6
finance and accounting index (API)33.3
healthcare and medical index (API)32.4

view source ↗all source data and breakdowns (json) ↗

each configuration is listed separately; these evaluations describe the tested model configuration, and performance and costs can differ on impossibl. unmeasured scores are omitted and api values keep their source units. last checked 2026-10-14.

compare GLM-5.2 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 →
meta/muse-wonder$4.00 / $20.00compare →
xiaomi/mimo-v2.6-pro$0.435 / $0.87compare →

impossibl models --all →

frequently asked questions

What is GLM-5.2?

GLM-5.2 is Z.AI's flagship foundation model for long-horizon engineering, from project-level codebase takeover and large refactors to deep debugging and research reproduction. It supports lossless long-context inputs, multiple thinking modes, streaming, and function calling, and Z.AI positions it as its leading open-source coding model.

How much does GLM-5.2 cost?

GLM-5.2 costs $1.40 per million input tokens and $4.40 per million output tokens through the Impossibl API. Cache reads cost $0.26 per million tokens. All rates are in USD.

view the pricing table ↑

What is the context length of GLM-5.2?

GLM-5.2 has a 1,000,000-token context window through the Impossibl API.

What inputs and outputs does GLM-5.2 support?

GLM-5.2 accepts text as input. GLM-5.2 returns text.

How do I use GLM-5.2 through an API?

GLM-5.2 is available through the Impossibl API. Use zai/glm-5.2 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-5.2 released?

Z.AI released GLM-5.2 on June 16, 2026.

Creator release announcement ↗

this page describes GLM-5.2 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 →