OpenAI compatible API · Attested · Public status

OpenAI: GPT-4o-mini vs Z.ai: GLM 5.2

GPT-4o-mini has the lower published input-plus-output rate. Z.ai: GLM 5.2 has more Credits provider routes and the larger context window. 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

GPT-4o-mini has the lower published input-plus-output rate. Z.ai: GLM 5.2 has more Credits provider routes and the larger context window. There is not enough recent probe data to compare speed.

$0.79125/1MOpenAI: GPT-4o-mini cheapest route

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

not enough dataOpenAI: GPT-4o-mini fastest measured p50 TTFT

891 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.

OpenAI: GPT-4o-miniZ.ai: GLM 5.2

Model idopenai/gpt-4o-miniz-ai/glm-5.2

Publisher OpenAI Z.AI

AI IQ — IQ 119#45

Context128,000 tokens1,048,576 tokens

Credits provider routes132

Cheapest route$0.79125/1M$2.2999/1M

Cached input$0.079125/1M$0.131875/1M to $0.93473/1M

Privacy posturehas ZDR routehas Confidential route (E2EE + ZDR)

Fastest measured p50 TTFTnot enough data891 ms via friendli

Highest measured throughputnot enough data174 tok/s via databricks

Recent route uptime range100.00%33.33% to 100.00%

Modes chat chat

OpenAI: GPT-4o-mini routes

Overview1 Credits routes

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="openai/gpt-4o-mini",
    messages=messages,
)

Questions

Which should I use, OpenAI: GPT-4o-mini or Z.ai: GLM 5.2?

GPT-4o-mini has the lower published input-plus-output rate. Z.ai: GLM 5.2 has more Credits provider routes and the larger context window. There is not enough recent probe data to compare speed.

Is OpenAI: GPT-4o-mini or Z.ai: GLM 5.2 cheaper?

The current cheapest TrustedRouter route is $0.79125/1M for OpenAI: GPT-4o-mini and $2.2999/1M for Z.ai: GLM 5.2. The comparison uses current catalog prices and updates as provider pricing changes.

Is OpenAI: GPT-4o-mini or Z.ai: GLM 5.2 faster?

Current measured p50 time to first token is not enough data for OpenAI: GPT-4o-mini and 891 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 OpenAI: GPT-4o-mini 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 openai/gpt-4o-mini and z-ai/glm-5.2. This makes side-by-side evals possible without maintaining two provider integrations.