OpenAI compatible API · Attested · Public status

OpenAI: GPT-6 Astra vs Z.ai: GLM 5.1

GPT-6 Astra 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 OpenAI: GPT-6 Astra has the larger context window. Current TrustedRouter probes show Z.ai: GLM 5.1 with the lower p50 TTFT.

$63.3/1MOpenAI: GPT-6 Astra cheapest route

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

2769 msOpenAI: GPT-6 Astra fastest measured p50 TTFT via openai

1938 msZ.ai: GLM 5.1 fastest measured p50 TTFT via telnyx

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-6 AstraZ.ai: GLM 5.1

Model idopenai/gpt-6-astraz-ai/glm-5.1

Publisher OpenAI Z.AI

AI IQ IQ 139#1 IQ 114#43

Context1,050,000 tokens200,000 tokens

Credits provider routes115

Cheapest route$63.3/1M$4.2833/1M

Cached input$1.055/1M to $2.11/1M$0.10339/1M to $0.643403/1M

Privacy posturehas ZDR routehas provider E2EE route

Fastest measured p50 TTFT2769 ms via openai1938 ms via telnyx

Highest measured throughputnot enough datanot enough data

Recent route uptime range100.00%0.00% to 100.00%

Modes chat chat

OpenAI: GPT-6 Astra routes

Overview1 Credits routes

Z.ai: GLM 5.1 routes

Overview15 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-6-astra",
    messages=messages,
)

Questions

Which should I use, OpenAI: GPT-6 Astra or Z.ai: GLM 5.1?

Is OpenAI: GPT-6 Astra or Z.ai: GLM 5.1 cheaper?

The current cheapest TrustedRouter route is $63.3/1M for OpenAI: GPT-6 Astra and $4.2833/1M for Z.ai: GLM 5.1. The comparison uses current catalog prices and updates as provider pricing changes.

Is OpenAI: GPT-6 Astra or Z.ai: GLM 5.1 faster?

Current measured p50 time to first token is 2769 ms for OpenAI: GPT-6 Astra and 1938 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 OpenAI: GPT-6 Astra 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 openai/gpt-6-astra and z-ai/glm-5.1. This makes side-by-side evals possible without maintaining two provider integrations.