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Anthropic: Claude Fable 5 vs OpenAI: gpt-oss-120b

Try both on us. Starter credit covers your first requests, then one key routes Claude Fable 5 and gpt-oss-120b. Switch by changing the model name.

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

Claude Fable 5 has the larger context window. gpt-oss-120b has the lower published input-plus-output rate, more Credits provider routes and the lower measured p50 time to first token.

$63.3/1MAnthropic: Claude Fable 5 cheapest route

$0.211/1MOpenAI: gpt-oss-120b cheapest route

3335 msAnthropic: Claude Fable 5 fastest measured p50 TTFT via anthropic

689 msOpenAI: gpt-oss-120b fastest measured p50 TTFT via tinfoil

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 5OpenAI: gpt-oss-120b

Model idanthropic/claude-fable-5openai/gpt-oss-120b

Publisher Anthropic OpenAI

AI IQ IQ 133#10 IQ 98#133

Context1,000,000 tokens131,072 tokens

Credits provider routes124

Cheapest route$63.3/1M$0.211/1M

Cached input$1.055/1M$0.015825/1M to $0.1055/1M

Privacy postureprovider posture varieshas Confidential route (E2EE + ZDR)

Fastest measured p50 TTFT3335 ms via anthropic689 ms via tinfoil

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

OpenAI: gpt-oss-120b routes

Overview24 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 OpenAI: gpt-oss-120b?

Claude Fable 5 has the larger context window. gpt-oss-120b has the lower published input-plus-output rate, more Credits provider routes and the lower measured p50 time to first token.

Is Anthropic: Claude Fable 5 or OpenAI: gpt-oss-120b cheaper?

The current cheapest TrustedRouter route is $63.3/1M for Anthropic: Claude Fable 5 and $0.211/1M for OpenAI: gpt-oss-120b. The comparison uses current catalog prices and updates as provider pricing changes.

Is Anthropic: Claude Fable 5 or OpenAI: gpt-oss-120b faster?

Current measured p50 time to first token is 3335 ms for Anthropic: Claude Fable 5 and 689 ms for OpenAI: gpt-oss-120b. These are routed probe measurements, not vendor-advertised speeds, and update as new samples arrive.

Can I test Anthropic: Claude Fable 5 and OpenAI: gpt-oss-120b 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 openai/gpt-oss-120b. This makes side-by-side evals possible without maintaining two provider integrations.