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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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.
GPT-6 Astra
Our most capable model, built for the hardest end-to-end 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-5.6 Sol
Flagship model for complex professional work
Model ID
gpt-5.6-sol
Alias
gpt-5.6
Reasoning
nonelowmediumhighxhighmax
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