OpenAI compatible API · Attested · Public status

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

Claude Fable 5 vs Z.ai: GLM 5.3 Flash: 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 Flash has the lower cheapest prompt+completion route on TrustedRouter. Z.ai: GLM 5.3 Flash has more provider fallback routes, while Z.ai: GLM 5.3 Flash has the larger context window. Current TrustedRouter probes show Z.ai: GLM 5.3 Flash with the lower p50 TTFT.

$63.3/1MAnthropic: Claude Fable 5 cheapest route

$0.32705/1MZ.ai: GLM 5.3 Flash cheapest route

3703 msAnthropic: Claude Fable 5 fastest measured p50 TTFT via anthropic

1308 msZ.ai: GLM 5.3 Flash fastest measured p50 TTFT via sail-research

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 Flash

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

Publisher Anthropic Z.AI

AI IQ IQ 136#3 IQ 116#40

Context1,000,000 tokens1,048,576 tokens

Credits provider routes126

Cheapest route$63.3/1M$0.32705/1M

Cached input$1.055/1M$0.015825/1M to $0.110775/1M

Privacy postureprovider posture varieshas provider E2EE route

Fastest measured p50 TTFT3703 ms via anthropic1308 ms via sail-research

Highest measured throughputnot enough datanot enough data

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

Modes chat messages chat

Anthropic: Claude Fable 5 routes

Overview1 Credits routes

Z.ai: GLM 5.3 Flash 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 Flash?

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

The current cheapest TrustedRouter route is $63.3/1M for Anthropic: Claude Fable 5 and $0.32705/1M for Z.ai: GLM 5.3 Flash. The comparison uses current catalog prices and updates as provider pricing changes.

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

Current measured p50 time to first token is 3703 ms for Anthropic: Claude Fable 5 and 1308 ms for Z.ai: GLM 5.3 Flash. 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 Flash 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-flash. This makes side-by-side evals possible without maintaining two provider integrations.