OpenAI compatible API · Attested · Public status

IBM: Granite 4.2 8B vs Z.ai: GLM 5.1

IBM: Granite 4.2 8B vs Z.ai: GLM 5.1: 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

IBM: Granite 4.2 8B has the lower published input-plus-output rate. Z.ai: GLM 5.1 has more Credits provider routes, the larger context window and the lower measured p50 time to first token.

$0.26375/1MIBM: Granite 4.2 8B cheapest route

$4.2833/1MZ.ai: GLM 5.1 cheapest route

1391 msIBM: Granite 4.2 8B fastest measured p50 TTFT via wandb

529 msZ.ai: GLM 5.1 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.

IBM: Granite 4.2 8BZ.ai: GLM 5.1

Model idibm-granite/granite-4.2-8bz-ai/glm-5.1

PublisherIBM Z.AI

AI IQ IQ 93#143 IQ 113#57

Context131,072 tokens202,752 tokens

Credits provider routes213

Cheapest route$0.26375/1M$4.2833/1M

Cached input$0.015825/1M to $0.05275/1M$0.10339/1M to $0.686805/1M

Privacy postureprovider posture varieshas Confidential route (E2EE + ZDR)

Fastest measured p50 TTFT1391 ms via wandb529 ms via friendli

Highest measured throughputnot enough datanot enough data

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

Modes chat chat

IBM: Granite 4.2 8B routes

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

Z.ai: GLM 5.1 routes

Overview13 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="ibm-granite/granite-4.2-8b",
    messages=messages,
)

Questions

Which should I use, IBM: Granite 4.2 8B or Z.ai: GLM 5.1?

IBM: Granite 4.2 8B has the lower published input-plus-output rate. Z.ai: GLM 5.1 has more Credits provider routes, the larger context window and the lower measured p50 time to first token.

Is IBM: Granite 4.2 8B or Z.ai: GLM 5.1 cheaper?

The current cheapest TrustedRouter route is $0.26375/1M for IBM: Granite 4.2 8B and $4.2833/1M for Z.ai: GLM 5.1. The comparison uses current catalog prices and updates as provider pricing changes.

Is IBM: Granite 4.2 8B or Z.ai: GLM 5.1 faster?

Current measured p50 time to first token is 1391 ms for IBM: Granite 4.2 8B and 529 ms for Z.ai: GLM 5.1. These are routed probe measurements, not vendor-advertised speeds, and update as new samples arrive.

Can I test IBM: Granite 4.2 8B and Z.ai: GLM 5.1 with the same API?

Yes. Use the same OpenAI-compatible TrustedRouter base URL and API key, then change only the model id between ibm-granite/granite-4.2-8b and z-ai/glm-5.1. This makes side-by-side evals possible without maintaining two provider integrations.