Bring your own key

Claude Sonnet 4.5 20250929 vs OpenAI: gpt-oss-120b

One key routes both. Starter credit covers your first gpt-oss-120b requests, while Claude Sonnet 4.5 20250929 runs on your own provider key. 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 Sonnet 4.5 20250929 has the larger context window. gpt-oss-120b has more Credits provider routes. A published Credits price comparison is not available for both models. There is not enough recent probe data to compare speed.

$18.99/1MClaude Sonnet 4.5 20250929 cheapest route

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

not enough dataClaude Sonnet 4.5 20250929 fastest measured p50 TTFT

543 msOpenAI: gpt-oss-120b fastest measured p50 TTFT via akashml

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.

Claude Sonnet 4.5 20250929OpenAI: gpt-oss-120b

Model idanthropic/claude-sonnet-4.5-20250929openai/gpt-oss-120b

Publisher Anthropic OpenAI

AI IQ — IQ 98#136

Context200,000 tokens131,072 tokens

Credits provider routes024

Cheapest route$18.99/1M$0.211/1M

Cached inputNot published$0.015825/1M to $0.1055/1M

Privacy postureprovider posture varieshas Confidential route (E2EE + ZDR)

Fastest measured p50 TTFTnot enough data543 ms via akashml

Highest measured throughputnot enough datanot enough data

Recent route uptime rangenot enough data0.00% to 100.00%

Modes chat messages chat

Claude Sonnet 4.5 20250929 routes

Overview0 Credits routes

OpenAI: gpt-oss-120b routes

Overview24 Credits routes
PricingInput, cached input, and output rates
ProvidersAll serving providers

Related comparisons

Browse every comparison

OpenAI: gpt-oss-120b vs Z.ai: GLM 5.357 combined provider routes
OpenAI: gpt-oss-120b vs Z.ai: GLM 5.256 combined provider routes
OpenAI: gpt-oss-120b vs Z.ai: GLM 5.3 Flash56 combined provider routes
MoonshotAI: Kimi K3 vs OpenAI: gpt-oss-120b52 combined provider routes
DeepSeek: DeepSeek V4 Flash 0731 vs OpenAI: gpt-oss-120b50 combined provider routes
DeepSeek: DeepSeek V4.1 Flash vs OpenAI: gpt-oss-120b48 combined provider routes
OpenAI: gpt-oss-120b vs Qwen: Qwen3.8 27B46 combined provider routes
MoonshotAI: Kimi K2.6 vs OpenAI: gpt-oss-120b41 combined provider routes

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-sonnet-4.5-20250929",
    messages=messages,
)

Questions

Which should I use, Claude Sonnet 4.5 20250929 or OpenAI: gpt-oss-120b?

Is Claude Sonnet 4.5 20250929 or OpenAI: gpt-oss-120b cheaper?

The current cheapest TrustedRouter route is $18.99/1M for Claude Sonnet 4.5 20250929 and $0.211/1M for OpenAI: gpt-oss-120b. The comparison uses current catalog prices and updates as provider pricing changes.

Is Claude Sonnet 4.5 20250929 or OpenAI: gpt-oss-120b faster?

Current measured p50 time to first token is not enough data for Claude Sonnet 4.5 20250929 and 543 ms for OpenAI: gpt-oss-120b. These are routed probe measurements, not vendor-advertised speeds, and update as new samples arrive.

Can I test Claude Sonnet 4.5 20250929 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-sonnet-4.5-20250929 and openai/gpt-oss-120b. This makes side-by-side evals possible without maintaining two provider integrations.