OpenAI compatible API · Attested · Public status

StepFun: Step 3.5 Flash vs Z.ai: GLM 5.2

Step 3.5 Flash vs Z.ai: GLM 5.2: compare current API pricing, context, provider routes, privacy, p50 latency, and OpenAI-compatible access.

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

StepFun: Step 3.5 Flash has the lower cheapest prompt+completion route on TrustedRouter. Z.ai: GLM 5.2 has more provider fallback routes, while Z.ai: GLM 5.2 has the larger context window. Current TrustedRouter probes show Z.ai: GLM 5.2 with the lower p50 TTFT.

$0.422/1MStepFun: Step 3.5 Flash cheapest route

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

4284 msStepFun: Step 3.5 Flash fastest measured p50 TTFT via stepfun

594 msZ.ai: GLM 5.2 fastest measured p50 TTFT via together

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: Step 3.5 FlashZ.ai: GLM 5.2

Model idstepfun/step-3.5-flashz-ai/glm-5.2

Publisher StepFun Z.AI

AI IQ — IQ 120#28

Context262,144 tokens1,048,576 tokens

Credits provider routes128

Cheapest route$0.422/1M$2.2999/1M

Cached input$0.0211/1M$0.110775/1M to $1.0339/1M

Privacy postureprovider posture varieshas provider E2EE route

Fastest measured p50 TTFT4284 ms via stepfun594 ms via together

Highest measured throughputnot enough data130 tok/s via baseten

Recent route uptime range100.00%100.00%

Modes chat chat

StepFun: Step 3.5 Flash routes

Overview1 Credits routes

Z.ai: GLM 5.2 routes

Overview28 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/step-3.5-flash",
    messages=messages,
)

Questions

Which should I use, StepFun: Step 3.5 Flash or Z.ai: GLM 5.2?

Is StepFun: Step 3.5 Flash or Z.ai: GLM 5.2 cheaper?

The current cheapest TrustedRouter route is $0.422/1M for StepFun: Step 3.5 Flash and $2.2999/1M for Z.ai: GLM 5.2. The comparison uses current catalog prices and updates as provider pricing changes.

Is StepFun: Step 3.5 Flash or Z.ai: GLM 5.2 faster?

Current measured p50 time to first token is 4284 ms for StepFun: Step 3.5 Flash and 594 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: Step 3.5 Flash 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/step-3.5-flash and z-ai/glm-5.2. This makes side-by-side evals possible without maintaining two provider integrations.