OpenAI compatible API · Attested · Public status

DeepSeek: DeepSeek V4 Flash 0731 vs Z.ai: GLM 5.1

DeepSeek V4 Flash 0731 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

DeepSeek: DeepSeek V4 Flash 0731 has the lower cheapest prompt+completion route on TrustedRouter. Z.ai: GLM 5.1 has more provider fallback routes, while DeepSeek: DeepSeek V4 Flash 0731 has the larger context window. Current TrustedRouter probes show DeepSeek: DeepSeek V4 Flash 0731 with the lower p50 TTFT.

$0.273/1MDeepSeek: DeepSeek V4 Flash 0731 cheapest route

$4.263/1MZ.ai: GLM 5.1 cheapest route

1018 msDeepSeek: DeepSeek V4 Flash 0731 fastest measured p50 TTFT via baseten

1079 msZ.ai: GLM 5.1 fastest measured p50 TTFT via wafer

DeepSeek: DeepSeek V4 Flash 0731Z.ai: GLM 5.1

Model iddeepseek/deepseek-v4-flash-0731z-ai/glm-5.1

Publisher DeepSeek Z.AI

AI IQ — IQ 114#32

Context1,048,576 tokens204,800 tokens

Provider routes1624

Cheapest route$0.273/1M$4.263/1M

Privacy posturehas ZDR routehas confidential-compute route

Fastest measured p50 TTFT1018 ms via baseten1079 ms via wafer

Highest measured throughput130 tok/s via atlas-cloudnot enough data

Recent route uptime range99.80% to 100.00%66.67% to 100.00%

Modes chat chat

DeepSeek: DeepSeek V4 Flash 0731 routes

Overview16 endpoints
PricingPrompt and completion rates
ProvidersAll serving providers

Z.ai: GLM 5.1 routes

Overview24 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="deepseek/deepseek-v4-flash-0731",
    messages=messages,
)

Questions

Which should I use, DeepSeek: DeepSeek V4 Flash 0731 or Z.ai: GLM 5.1?

Is DeepSeek: DeepSeek V4 Flash 0731 or Z.ai: GLM 5.1 cheaper?

The current cheapest TrustedRouter route is $0.273/1M for DeepSeek: DeepSeek V4 Flash 0731 and $4.263/1M for Z.ai: GLM 5.1. The comparison uses current catalog prices and updates as provider pricing changes.

Is DeepSeek: DeepSeek V4 Flash 0731 or Z.ai: GLM 5.1 faster?

Current measured p50 time to first token is 1018 ms for DeepSeek: DeepSeek V4 Flash 0731 and 1079 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 DeepSeek: DeepSeek V4 Flash 0731 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 deepseek/deepseek-v4-flash-0731 and z-ai/glm-5.1. This makes side-by-side evals possible without maintaining two provider integrations.