OpenAI compatible API · Attested · Public status

Anthropic: Claude Fable 5 vs Z.ai: GLM 5.3

Claude Fable 5 vs Z.ai: GLM 5.3: 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 5.3 has the lower published input-plus-output rate, more Credits provider routes, the larger context window and the lower measured p50 time to first token.

$63.3/1MAnthropic: Claude Fable 5 cheapest route

$3.621393/1MZ.ai: GLM 5.3 cheapest route

3253 msAnthropic: Claude Fable 5 fastest measured p50 TTFT via anthropic

1000 msZ.ai: GLM 5.3 fastest measured p50 TTFT via pearl

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.

Anthropic: Claude Fable 5Z.ai: GLM 5.3

Model idanthropic/claude-fable-5z-ai/glm-5.3

Publisher Anthropic Z.AI

AI IQ IQ 136#6 IQ 127#15

Context1,000,000 tokens1,048,576 tokens

Credits provider routes126

Cheapest route$63.3/1M$3.621393/1M

Cached input$1.055/1M$0.1477/1M to $1.02546/1M

Privacy postureprovider posture varieshas provider E2EE route

Fastest measured p50 TTFT3253 ms via anthropic1000 ms via pearl

Highest measured throughputnot enough data179 tok/s via akashml

Recent route uptime range100.00%62.50% to 100.00%

Modes chat messages chat

Anthropic: Claude Fable 5 routes

Overview1 Credits routes

Z.ai: GLM 5.3 routes

Overview26 Credits routes
PricingInput, cached input, and output 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="anthropic/claude-fable-5",
    messages=messages,
)

Questions

Which should I use, Anthropic: Claude Fable 5 or Z.ai: GLM 5.3?

Z.ai: GLM 5.3 has the lower published input-plus-output rate, more Credits provider routes, the larger context window and the lower measured p50 time to first token.

Is Anthropic: Claude Fable 5 or Z.ai: GLM 5.3 cheaper?

The current cheapest TrustedRouter route is $63.3/1M for Anthropic: Claude Fable 5 and $3.621393/1M for Z.ai: GLM 5.3. The comparison uses current catalog prices and updates as provider pricing changes.

Is Anthropic: Claude Fable 5 or Z.ai: GLM 5.3 faster?

Current measured p50 time to first token is 3253 ms for Anthropic: Claude Fable 5 and 1000 ms for Z.ai: GLM 5.3. These are routed probe measurements, not vendor-advertised speeds, and update as new samples arrive.

Can I test Anthropic: Claude Fable 5 and Z.ai: GLM 5.3 with the same API?

Yes. Use the same OpenAI-compatible TrustedRouter base URL and API key, then change only the model id between anthropic/claude-fable-5 and z-ai/glm-5.3. This makes side-by-side evals possible without maintaining two provider integrations.