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OpenAI

Every OpenAI model on Synthorai: one endpoint, live prices.

21 models · chat / code / tools / reasoning · from $0.2/M input

Why OpenAI via Synthorai

  • Bring your own key. Bring your own OpenAI key: zero markup, free during early access.
  • Zero prompt retention. Zero prompt retention at the gateway by default; OpenAI's own API data policies apply upstream. Details →
  • Prompt caching. Automatic prefix caching once a prompt passes the minimum length, with no code changes; cached reads are discounted (up to 90% on current models) and there is no write fee. Cache reads from $0.1/M.

OpenAI models & pricing

ModelInput /MOutput /MCache read /MContext
GPT-5.4 Pro $30$180$15922K
GPT-5.5 Pro $30$1801.1M
GPT-5.5 $5$30$0.5922K
GPT-5.6 $5$30$0.51.1M
GPT-5.6 Sol $5$30$0.51.1M
GPT Image 1 $5$40
gpt-image-1.5 $5$32
GPT Image 2 $5$30
GPT-4o Transcribe $2.5$1016K
GPT-4o Transcribe Diarize $2.5$2.516K
GPT-5.4 $2.5$15$1.25922K
GPT-5.6 Terra $2.5$15$0.251.1M
GPT Image 1 Mini $2$8
GPT-5.2 $1.75$14$0.875400K
GPT-5.2 Codex $1.75$14$0.875400K
GPT-5.3 Codex $1.75$14$0.875400K
GPT-4o Mini Transcribe $1.25$516K
GPT-5.6 Luna $1$6$0.11.1M
GPT-5.4 Mini $0.75$4.5$0.375400K
GPT-5.4 Nano $0.2$1.25$0.1400K
Whisper v1 $0.006/min

Provider list prices: no platform markup. Prices refresh live on each model's page. These are official list prices. Logged-in customers may see effective prices including workspace discounts on /console/pricing.

Use OpenAI models in 30 seconds

from openai import OpenAI

client = OpenAI(
    base_url="https://synthorai.io/v1",
    api_key="sk-syn-...",
)

resp = client.chat.completions.create(
    model="gpt-5.4-pro",
    messages=[{"role": "user", "content": "Summarize this diff"}],
    reasoning_effort="medium",
)
print(resp.choices[0].message.content)

About OpenAI

OpenAI's API spans the GPT chat family, o-series reasoning models, image generation and speech-to-text. On Synthorai every OpenAI model sits behind the same endpoint and SDK you already use (swap the base_url, keep your code) with live pay-as-you-go pricing and prompt-cache reads billed at provider rates.

FAQ

How do I get an OpenAI API key without a subscription?

You don't need an OpenAI account: sign up on Synthorai, create one API key, and every OpenAI model on this page works through the OpenAI-compatible endpoint: pay-as-you-go, no subscription (models marked "invited beta" additionally need an approved application).

What does the OpenAI API cost?

Token-billed models start at $0.2/M input tokens; every model's live per-unit price is in the table above. These are provider list prices with no platform markup.

Can I use my own OpenAI key (BYOK)?

Yes. Bring your own OpenAI key: zero markup, free during early access. Your key stays in an encrypted vault and requests using it bill at provider list price.

What is OpenAI's data-retention policy via API?

Zero prompt retention at the gateway by default; OpenAI's own API data policies apply upstream.

Other providers

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