OpenAI compatible API · Attested · Public status

Doubao Seed Evolving vs Z.ai: GLM 5.1

Doubao Seed Evolving 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

Z.ai: GLM 5.1 has the lower cheapest prompt+completion route on TrustedRouter. Z.ai: GLM 5.1 has more provider fallback routes, while Doubao Seed Evolving has the larger context window. Probe-backed speed data is shown when enough recent samples exist.

$5.697/1MDoubao Seed Evolving cheapest route

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

not enough dataDoubao Seed Evolving fastest measured p50 TTFT

949 msZ.ai: GLM 5.1 fastest measured p50 TTFT via friendli

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.

Doubao Seed EvolvingZ.ai: GLM 5.1

Model idbytedance/doubao-seed-evolvingz-ai/glm-5.1

Publisher Atlas Cloud Z.AI

AI IQ — IQ 114#39

Context262,144 tokens204,800 tokens

Provider routes125

Cheapest route$5.697/1M$4.2833/1M

Privacy postureprovider posture varieshas provider E2EE route

Fastest measured p50 TTFTnot enough data949 ms via friendli

Highest measured throughputnot enough datanot enough data

Recent route uptime range100.00%100.00%

Modes chat chat

Doubao Seed Evolving routes

Overview1 endpoints

Z.ai: GLM 5.1 routes

Overview25 endpoints
PricingPrompt and completion 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="bytedance/doubao-seed-evolving",
    messages=messages,
)

Questions

Which should I use, Doubao Seed Evolving or Z.ai: GLM 5.1?

Is Doubao Seed Evolving or Z.ai: GLM 5.1 cheaper?

The current cheapest TrustedRouter route is $5.697/1M for Doubao Seed Evolving and $4.2833/1M for Z.ai: GLM 5.1. The comparison uses current catalog prices and updates as provider pricing changes.

Is Doubao Seed Evolving or Z.ai: GLM 5.1 faster?

Current measured p50 time to first token is not enough data for Doubao Seed Evolving and 949 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 Doubao Seed Evolving 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 bytedance/doubao-seed-evolving and z-ai/glm-5.1. This makes side-by-side evals possible without maintaining two provider integrations.