OpenAI compatible API · Attested · Public status

OpenAI: gpt-oss-120b vs GLM 5.3 Fast on Fireworks

gpt-oss-120b vs GLM 5.3 Fast on Fireworks: 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

OpenAI: gpt-oss-120b has the lower cheapest prompt+completion route on TrustedRouter. OpenAI: gpt-oss-120b has more provider fallback routes, while GLM 5.3 Fast on Fireworks has the larger context window. Current TrustedRouter probes show OpenAI: gpt-oss-120b with the lower p50 TTFT.

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

$9.1785/1MGLM 5.3 Fast on Fireworks cheapest route

596 msOpenAI: gpt-oss-120b fastest measured p50 TTFT via cerebras

893 msGLM 5.3 Fast on Fireworks fastest measured p50 TTFT via fireworks

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-oss-120bGLM 5.3 Fast on Fireworks

Model idopenai/gpt-oss-120bz-ai/glm-5.3-fast

Publisher OpenAI Z.AI

AI IQ IQ 105#70 —

Context131,072 tokens1,048,576 tokens

Credits provider routes192

Cheapest route$0.211/1M$9.1785/1M

Cached input$0.015825/1M to $0.1055/1M$0.22155/1M to $0.41145/1M

Privacy posturehas provider E2EE routehas ZDR route

Fastest measured p50 TTFT596 ms via cerebras893 ms via fireworks

Highest measured throughputnot enough datanot enough data

Recent route uptime range0.00% to 100.00%100.00%

Modes chat chat

OpenAI: gpt-oss-120b routes

Overview19 Credits routes
PricingInput, cached input, and output rates
ProvidersAll serving providers

GLM 5.3 Fast on Fireworks routes

Overview2 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="openai/gpt-oss-120b",
    messages=messages,
)

Questions

Which should I use, OpenAI: gpt-oss-120b or GLM 5.3 Fast on Fireworks?

Is OpenAI: gpt-oss-120b or GLM 5.3 Fast on Fireworks cheaper?

The current cheapest TrustedRouter route is $0.211/1M for OpenAI: gpt-oss-120b and $9.1785/1M for GLM 5.3 Fast on Fireworks. The comparison uses current catalog prices and updates as provider pricing changes.

Is OpenAI: gpt-oss-120b or GLM 5.3 Fast on Fireworks faster?

Current measured p50 time to first token is 596 ms for OpenAI: gpt-oss-120b and 893 ms for GLM 5.3 Fast on Fireworks. These are routed probe measurements, not vendor-advertised speeds, and update as new samples arrive.

Can I test OpenAI: gpt-oss-120b and GLM 5.3 Fast on Fireworks 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-oss-120b and z-ai/glm-5.3-fast. This makes side-by-side evals possible without maintaining two provider integrations.