OpenAI compatible API · Attested · Public status

Google: Gemini 3.5 Flash vs OpenAI: GPT-5.5

Compare Google: Gemini 3.5 Flash and OpenAI: GPT-5.5 by providers, context, price, and TrustedRouter route support.

Verify gateway

Onebase URL to migrate

100sof models and routes

Noneprompt logs by default

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

Google: Gemini 3.5 Flash has the lower cheapest prompt+completion route on TrustedRouter. Google: Gemini 3.5 Flash has more provider fallback routes, while OpenAI: GPT-5.5 has the larger context window. Probe-backed speed data is shown when enough recent samples exist.

$11.025/1MGoogle: Gemini 3.5 Flash cheapest route

$36.75/1MOpenAI: GPT-5.5 cheapest route

4623 msGoogle: Gemini 3.5 Flash measured p50 TTFT

not enough dataOpenAI: GPT-5.5 measured p50 TTFT

Google: Gemini 3.5 FlashOpenAI: GPT-5.5

Model idgoogle/gemini-3.5-flashopenai/gpt-5.5

PublisherGoogle AI StudioOpenAI

AI IQ IQ 123#11 IQ 132#3

Context1,048,576 tokens1,050,000 tokens

Provider routes74

Cheapest route$11.025/1M$36.75/1M

Privacy postureprovider posture variesprovider posture varies

Modes chat chat

Google: Gemini 3.5 Flash routes

Overview7 endpoints
PricingPrompt and completion rates
ProvidersAll serving providers

OpenAI: GPT-5.5 routes

Overview4 endpoints
PricingPrompt and completion rates
BenchmarksTrustedRouter and external sources
ProvidersAll serving providers

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="google/gemini-3.5-flash",
    messages=messages,
)