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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-6.1 Sol to balance intelligence and cost, or GPT-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.
GPT-6 Astra
Our most capable model for the most demanding work.
Model ID
gpt-6-astra
Reasoning
lowmediumhighxhighmax
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-6.1 Sol
Near-Astra performance for complex work at a lower cost.
Model ID
gpt-6.1-sol
Reasoning
lowmediumhighxhighmax
Input price
$2 / Input MTok
Output price
$10 / Output MTok
Max output
128K tokens
Context window
1.05M
Knowledge cutoff
Apr 30, 2026
Tools
Functions, Web search, File search, Computer use
GPT-6.1 Terra
A fast, efficient model for visual reasoning, precise computer use, and clear, natural writing.
Model ID
gpt-6.1-terra
Reasoning
nonelowmediumhighxhighmax
Input price
$1 / Input MTok
Output price
$5 / Output MTok
Max output
128K tokens
Context window
1.05M
Knowledge cutoff
Jun 1, 2026
Tools
Functions, Web search, File search, Computer use
GPT-6 Luna
Our most efficient model for focused, high-volume tasks.
Model ID
gpt-6-luna
Reasoning
nonelowmediumhighxhighmax
Input price
$0.1 / Input MTok
Output price
$0.5 / Output MTok
Max output
128K tokens
Context window
1.05M
Knowledge cutoff
May 18, 2026
Tools
Functions, Web search, File search, Computer use

Specialized models

Purpose-built for specific tasks.

Life sciences
Models for life sciences research
gpt-rosalind-research
GPT-RosalindLife sciences reasoning for approved organizations

Browse our full catalog of models

Diverse models for a variety of tasks

How we use your data·Deprecated models