GPAI Ledger › Model catalog (developer docs) (OpenAI) › Capture 20 Aug 2026

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Models | OpenAI API

For the complete documentation index, see
llms.txt
. Markdown versions of documentation pages are available by appending

.md
 to the page URL.

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responses create
reasoning_effort
realtime
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 Codex as a platform: build on the open agent harness

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 How Perplexity Brought Voice Search to Millions Using the Realtime API

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API Dashboard

Try ChatGPT

 Model catalog

Choose a model

 Pricing

 Model selection

Text and code

 Text generation

 Code generation

 Structured output

Prompting

 Overview

 Prompt engineering

 Citation formatting

 Migration guide

 Prompt generation

 Frontend prompting

Reasoning

 Reasoning models

 Reasoning best practices

Images and video

 Images and vision

 Image generation

 Video generation

Realtime and audio

 Audio and speech

 Overview

 Voice agents

Specialized models

 Deep research

 Embeddings

 Moderation

Models
Choosing a model
If you're not sure where to start, use

GPT-5.6 Sol
,
our flagship model for complex reasoning and coding. Choose

GPT-5.6 Terra

to balance intelligence and cost, or

GPT-5.6 Luna
 for cost-sensitive, high-volume workloads.
All latest OpenAI models support text and image input, text output, multilingual capabilities, and vision. Models are available via the

Responses API

and our
Client SDKs
.
Frontier models
Start with
GPT-5.6 Sol
 for complex reasoning and coding, choose
GPT-5.6 Terra
 to balance intelligence and cost, or use
GPT-5.6 Luna
 for cost-sensitive, high-volume workloads.
View all
Compare models
GPT-5.6 Sol
Frontier model for complex professional work
Model ID
gpt-5.6-sol
Alias
gpt-5.6
Reasoning
none
low
medium
high
xhigh
max
Input price
$5 / Input MTok
Output price
$30 / Output MTok
Max output
128K tokens
Context window
1.05M
Knowledge cutoff
Feb 16, 2026
Tools
Functions, Web search, File search, Computer use
GPT-5.6 Terra
GPT-5.6 model that balances intelligence and cost
Model ID
gpt-5.6-terra
Reasoning
none
low
medium
high
xhigh
max
Input price
$2 / Input MTok
Output price
$12 / Output MTok
Max output
128K tokens
Context window
1.05M
Knowledge cutoff
Feb 16, 2026
Tools
Functions, Web search, File search, Computer use
GPT-5.6 Luna
GPT-5.6 model optimized for cost-sensitive workloads
Model ID
gpt-5.6-luna
Reasoning
none
low
medium
high
xhigh
max
Input price
$0.20 / Input MTok
Output price
$1.20 / Output MTok
Max output
128K tokens
Context window
1.05M
Knowledge cutoff
Feb 16, 2026
Tools
Functions, Web search, File search, Computer use
View more
Specialized models
Purpose-built for specific tasks.
OpenAI Daybreak
Frontier cyber models for defenders
GPT-5.6 Cyber
Our most advanced cybersecurity model for authorized vulnerability research and security testing.
Daybreak Red
An alias for advanced cybersecurity models for authorized vulnerability research and security testing.
Daybreak Blue
An alias for frontier general-purpose models with safeguards for defensive cybersecurity work.
Image
Models for image generation and editing
GPT Image 2
State-of-the-art image generation model
Realtime
Models for realtime speech and translation
GPT-Realtime-2.1
Reasoning model with tool use
GPT-Realtime-2.1 mini
Reasoning model with tool use
GPT-Realtime-2
Reasoning model with tool use
GPT-Realtime-Translate
Streaming speech-to-speech translation model
GPT-Realtime-1.5
The best voice model for audio in, audio out
GPT-Realtime mini
Deprecated
A cost-efficient version of GPT-Realtime
Speech generation
Models for generating natural-sounding speech from text
GPT-4o mini TTS
Text-to-speech model powered by GPT-4o mini
Transcription
Models for transcribing speech into text
GPT Transcribe
High-accuracy speech-to-text model for file and Realtime input transcription
GPT Live Transcribe
Low-latency speech-to-text model for realtime transcription
GPT-Realtime-Whisper
Streaming speech-to-text model for realtime transcription
GPT-4o Transcribe
Speech-to-text model powered by GPT-4o
GPT-4o mini Transcribe
Speech-to-text model powered by GPT-4o mini
Browse our full catalog of models
Diverse models for a variety of tasks
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Deprecated models

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