OpenAI compatible API · Attested · Public status

Z.ai: GLM 5.2 vs GLM 5.2 Fast on Fireworks

Z.ai: GLM 5.2 vs GLM 5.2 Fast on Fireworks: 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

Z.ai: GLM 5.2 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 GLM 5.2 Fast on Fireworks with the lower p50 TTFT.

$2.289/1MZ.ai: GLM 5.2 cheapest route

$9.135/1MGLM 5.2 Fast on Fireworks cheapest route

1520 msZ.ai: GLM 5.2 fastest measured p50 TTFT via telnyx

1414 msGLM 5.2 Fast on Fireworks fastest measured p50 TTFT via wafer

Z.ai: GLM 5.2GLM 5.2 Fast on Fireworks

Model idz-ai/glm-5.2z-ai/glm-5.2-fast

Publisher Z.AI Z.AI

AI IQ IQ 120#16 —

Context1,048,576 tokens1,048,576 tokens

Provider routes456

Cheapest route$2.289/1M$9.135/1M

Privacy posturehas provider E2EE routehas ZDR route

Fastest measured p50 TTFT1520 ms via telnyx1414 ms via wafer

Highest measured throughputnot enough data115 tok/s via baseten

Recent route uptime range80.00% to 100.00%100.00%

Modes chat chat

Z.ai: GLM 5.2 routes

Overview45 endpoints
PricingPrompt and completion rates
BenchmarksTrustedRouter and external sources
ProvidersAll serving providers

GLM 5.2 Fast on Fireworks routes

Overview6 endpoints
PricingPrompt and completion rates
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="z-ai/glm-5.2",
    messages=messages,
)

Questions

Which should I use, Z.ai: GLM 5.2 or GLM 5.2 Fast on Fireworks?

Is Z.ai: GLM 5.2 or GLM 5.2 Fast on Fireworks cheaper?

The current cheapest TrustedRouter route is $2.289/1M for Z.ai: GLM 5.2 and $9.135/1M for GLM 5.2 Fast on Fireworks. The comparison uses current catalog prices and updates as provider pricing changes.

Is Z.ai: GLM 5.2 or GLM 5.2 Fast on Fireworks faster?

Current measured p50 time to first token is 1520 ms for Z.ai: GLM 5.2 and 1414 ms for GLM 5.2 Fast on Fireworks. These are routed probe measurements, not vendor-advertised speeds, and update as new samples arrive.

Can I test Z.ai: GLM 5.2 and GLM 5.2 Fast on Fireworks with the same API?

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