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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
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API Dashboard

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Text and code

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

GPT-6 Astra
,
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
.
Flagship models
Compare model capabilities and specifications.
View all
Compare models
Astra
GPT-6 Astra
Our most capable model, built for the hardest end-to-end work
Model ID
gpt-6-astra
Reasoning
low
medium
high
xhigh
max
Input price
$10 / Input MTok
Output price
$50 / Output MTok
Max output
128K tokens
Context window
1.05M
Knowledge cutoff
Apr 30, 2026
Tools
Functions, Web search, File search, Computer use
GPT-5.6 Sol
Flagship model for complex professional work
Model ID
gpt-5.6-sol
Alias
gpt-5.6
Reasoning
none
low
medium
high
xhigh
max
Input price
$4 / Input MTok
Output price
$20 / 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
Advanced 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 flagship general-purpose models with safeguards for defensive cybersecurity work.
Image
Models for image generation and editing
GPT-Image-2.5 Sunburst
Our most capable model for image generation and editing
GPT-Image-2.5 Flare
Fast, high-quality everyday image generation
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
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