OpenAI models

OpenPAI fully integrates every available OpenAI model and keeps the model IDs consistent with the official ones. For live prices, refer to Console → Models.

Chat models

Model ID	Category	Context	Input price (per 1M tokens)	Output price (per 1M tokens)	Key features
`gpt-5.5`	Latest flagship	1M	See console	See console	A new class of intelligence for coding and professional work
`gpt-5.4`	Flagship (more affordable)	1M	See console	See console	High-quality code and general chat, better value
`gpt-5.4-mini`	Economical	400K	See console	See console	Strongest mini for code / computer use / subagents
`gpt-5.4-nano`	Fast & economical	—	—	—	Low-latency, low-cost, high-volume workloads
`gpt-4o`	Older flagship multimodal	128K	See console	See console	Vision, tools, JSON, streaming
`gpt-4o-mini`	Older economical	128K	See console	See console	Still available for legacy projects
`gpt-3.5-turbo`	Older economical	16K	—	—	Recommended only for legacy compatibility

OpenAI’s chat capabilities are increasingly centered on the GPT-5.x series, and OpenAI recommends the Responses API for new projects. The GPT-4o series remains callable.

Reasoning models (GPT-5.x / o series)

The GPT-5.x series has built-in reasoning, controlled via reasoning_effort; the o series (o3, o4-mini, etc.) is still available.

Model ID / parameter	Reasoning effort	Use case
`gpt-5.5` + `reasoning_effort: low`	Low	Simple reasoning, fast responses
`gpt-5.5` + `reasoning_effort: medium`	Medium	Balance of quality and speed
`gpt-5.5` + `reasoning_effort: high`	High	Complex logic, math, code
`o4-mini`	Medium-high	Economical reasoning
`o3`	High	Strong reasoning (previous-gen flagship reasoning)

Reasoning models are billed including invisible reasoning_tokens — they aren’t shown in content but count toward usage. Leave headroom when estimating max_completion_tokens.

resp = client.chat.completions.create(
    model="gpt-5.5",
    messages=[{"role": "user", "content": "Prove that √2 is irrational"}],
    reasoning_effort="high",
    max_completion_tokens=4096,
)

Image generation

Model ID	Type	Notes
`gpt-image-2`	Image generation	Latest generation, highest quality, supports multi-image editing
`gpt-image-1`	Image generation	Previous generation, high quality, supports multi-image editing
`dall-e-3`	Image generation	Classic DALL·E 3, sizes like 1024 / 1792
`dall-e-2`	Image generation	Older, cheaper

img = client.images.generate(
    model="gpt-image-2",
    prompt="A black-and-white pencil sketch of a Shiba Inu wearing glasses",
    size="1024x1024",
    n=1,
)
print(img.data[0].url)

Audio

Model ID	Use case
`whisper-1`	Speech to text (ASR)
`gpt-4o-transcribe`	High-quality transcription
`gpt-4o-mini-transcribe`	Economical transcription
`tts-1`	Text to speech (standard)
`tts-1-hd`	Text to speech (hi-fi)
`gpt-4o-mini-tts`	Next-gen TTS, more natural voice

curl https://openp.ai/v1/audio/speech \
  -H "Authorization: Bearer $OPENPAI_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"tts-1","input":"Hello from OpenPAI","voice":"alloy"}' \
  --output speech.mp3

Realtime (voice conversation)

Model ID	Use case
`gpt-realtime-2`	Latest realtime voice (with reasoning)
`gpt-realtime-1.5`	High-quality audio in / audio out
`gpt-realtime-translate`	Realtime speech-to-speech translation
`gpt-realtime-whisper`	Streaming speech-to-text
`gpt-4o-realtime-preview`	Previous-gen realtime multimodal conversation

Endpoint path: wss://openp.ai/v1/realtime?model=gpt-realtime-2, over WebSocket. See the Realtime API docs.

Embeddings

Model ID	Dimensions	Main scenario
`text-embedding-3-small`	1536 (reducible)	General, default recommendation
`text-embedding-3-large`	3072 (reducible)	High-quality retrieval
`text-embedding-ada-002`	1536	Legacy compatibility

Moderations

omni-moderation-latest — multimodal content-safety classification, free (some accounts must enable it).

Responses API

OpenAI’s newer /v1/responses endpoint unifies conversation state management, suited to agent scenarios. See the Responses API.

Detailed fields

General chat: Chat Completions
Image generation: Images
Audio: Audio Speech, Audio Transcriptions
Embeddings: Embeddings

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Chat models

Reasoning models (GPT-5.x / o series)

Image generation

Audio

Realtime (voice conversation)

Embeddings

Moderations

Responses API

Detailed fields

​Chat models

​Reasoning models (GPT-5.x / o series)

​Image generation

​Audio

​Realtime (voice conversation)

​Embeddings

​Moderations

​Responses API

​Detailed fields

Chat models

Reasoning models (GPT-5.x / o series)

Image generation

Audio

Realtime (voice conversation)

Embeddings

Moderations

Responses API

Detailed fields