OpenAI compatible API · Attested · Public status

stepfun-ai/Step-5-Preview vs Z.ai: GLM 5.2

Z.ai: GLM 5.2 has the lower published input-plus-output rate and more Credits provider routes. Their context windows are the same size. There is not enough recent probe data to compare speed. Compare price, speed, context, and privacy.

Verify gateway

Onebase URL to migrate

100sof models and routes

0prompt or output logs. Always.

Compare routesProviders, price, context, and policy posture in one view.

Use auto when uptime mattersKeep a primary model and let fallback handle provider failures.

Same API shapeUse the OpenAI client and set the model you want.

Practical read

Monthly evidence

Z.ai: GLM 5.2 has the lower published input-plus-output rate and more Credits provider routes. Their context windows are the same size. There is not enough recent probe data to compare speed.

$3.9035/1Mstepfun-ai/Step-5-Preview cheapest route

$2.2999/1MZ.ai: GLM 5.2 cheapest route

not enough datastepfun-ai/Step-5-Preview fastest measured p50 TTFT

614 msZ.ai: GLM 5.2 fastest measured p50 TTFT via friendli

The price comparison adds each route's rate for one million input tokens and one million output tokens; your cost depends on your input/output mix. Prices and live route measurements can change. Use the monthly reports when you need a stable evidence window, then run a small task-specific eval before choosing a production default.

stepfun-ai/Step-5-PreviewZ.ai: GLM 5.2

Model idstepfun-ai/step-5-previewz-ai/glm-5.2

Publisher StepFun Z.AI

AI IQ — IQ 119#45

Context1,048,576 tokens1,048,576 tokens

Credits provider routes232

Cheapest route$3.9035/1M$2.2999/1M

Cached input$0.05275/1M$0.131875/1M to $0.91996/1M

Privacy postureprovider posture varieshas Confidential route (E2EE + ZDR)

Fastest measured p50 TTFTnot enough data614 ms via friendli

Highest measured throughputnot enough data277 tok/s via telnyx

Recent route uptime rangenot enough data80.00% to 100.00%

Modes chat chat

stepfun-ai/Step-5-Preview routes

Overview2 Credits routes
PricingInput, cached input, and output rates
ProvidersAll serving providers

Z.ai: GLM 5.2 routes

Overview32 Credits routes
PricingInput, cached input, and output rates
BenchmarksTrustedRouter and external sources
ProvidersAll serving providers

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Production choice

Pick a default model. Keep fallback enabled.

TrustedRouter is useful when you know the model you want, but still need provider rollover, budget limits, usage records, and a prompt path you can verify.

OpenAI clientPython

client = OpenAI(
    base_url="https://api.trustedrouter.com/v1",
    api_key="sk-tr-v1-..."
)

response = client.chat.completions.create(
    model="stepfun-ai/step-5-preview",
    messages=messages,
)

Questions

Which should I use, stepfun-ai/Step-5-Preview or Z.ai: GLM 5.2?

Z.ai: GLM 5.2 has the lower published input-plus-output rate and more Credits provider routes. Their context windows are the same size. There is not enough recent probe data to compare speed.

Is stepfun-ai/Step-5-Preview or Z.ai: GLM 5.2 cheaper?

The current cheapest TrustedRouter route is $3.9035/1M for stepfun-ai/Step-5-Preview and $2.2999/1M for Z.ai: GLM 5.2. The comparison uses current catalog prices and updates as provider pricing changes.

Is stepfun-ai/Step-5-Preview or Z.ai: GLM 5.2 faster?

Current measured p50 time to first token is not enough data for stepfun-ai/Step-5-Preview and 614 ms for Z.ai: GLM 5.2. These are routed probe measurements, not vendor-advertised speeds, and update as new samples arrive.

Can I test stepfun-ai/Step-5-Preview and Z.ai: GLM 5.2 with the same API?

Yes. Use the same OpenAI-compatible TrustedRouter base URL and API key, then change only the model id between stepfun-ai/step-5-preview and z-ai/glm-5.2. This makes side-by-side evals possible without maintaining two provider integrations.