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OpenAI

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

28 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.
  • 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 $0.06/M.

Where OpenAI sits · input price across 60 chat models

  • Alibaba $0.05 - $2.5
  • ByteDance $0.1 - $0.5
  • Google $0.1 - $2
  • DeepSeek $0.138 - $1.32
  • Tencent $0.14
  • OpenAI $0.2 - $30
  • MiniMax $0.22 - $0.3
  • Moonshot $0.574 - $3
  • Anthropic $1 - $10
  • Z.ai $1 - $1.4

Each bar spans a vendor’s cheapest to most expensive chat model, so you can see where this one sits against the rest of the catalogue.

OpenAI models & pricing

Chat 12 models

Model Input /MOutput /MCache read /MContext
GPT-5.2 $1.75 $14 $0.875 400K
GPT-5.3 Codex $1.75 $14 $0.875 400K
GPT-5.4 $2.5 $15 $1.25 922K
GPT-5.4 Mini $0.75 $4.5 $0.375 400K
GPT-5.4 Nano $0.2 $1.25 $0.1 400K
GPT-5.4 Pro $30 $180 $15 922K
GPT-5.5 $5 $30 $0.5 1.1M
GPT-5.5 Pro $30 $180 - 1.1M
GPT-5.6 $5 $30 $0.5 1.1M
GPT-5.6 Luna $1 $6 $0.1 1.1M
GPT-5.6 Sol $5 $30 $0.5 1.1M
GPT-5.6 Terra $2.5 $15 $0.25 1.1M

Image 4 models

Audio 4 models

Model Price
GPT-4o Mini Transcribe $1.25/M tokens
GPT-4o Transcribe $2.5/M tokens
GPT-4o Transcribe Diarize $2.5/M tokens
Whisper v1 $0.006/min

Text to speech 2 models

Model Per M chars
TTS-1 $15
TTS-1 HD $30

Realtime 2 models

Model Input /MOutput /MCache read /M
GPT Realtime 2.1invited beta $4 $24 $0.4
GPT Realtime 2.1 Miniinvited beta $0.6 $2.4 $0.06
Superseded models (4)

Chat1 model

ModelInput /MOutput /MCache read /MContext
GPT-5.2 Codex $1.75$14$0.875400K

Video2 models

ModelPer second
Sora 2 $0.1/s
Sora 2 Pro $0.3-$0.5/s

Realtime1 model

ModelInput /MOutput /MCache read /M
GPT Realtimeinvited beta $4$16$0.4

These carry a deprecation date from the vendor, or a newer model in this catalogue names them as its predecessor. They stay routable at their published prices, so a pinned model id keeps working.

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. 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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