OpenAI
OpenAI: GPT-5.6 Terra
openai/gpt-5.6-terra
GPT-5.6 Terra is a balanced model in OpenAI's GPT-5.6 series, positioned between the flagship Sol tier and the cost-efficient Luna tier. It is suited for everyday coding, reasoning, and agentic tasks where capability and cost need to be balanced, offering strong performance at roughly half the cost of Sol.
Input
$2
/ 1M tokens
Output
$12
/ 1M tokens
Context window
1.05M
tokens
Limits
Context
1,050,000
tokens
Max output
128,000
12% of the context window
Model facts
Author
OpenAI
Tokenizer
GPT
Modality
Text + Image + File -> Text
Knowledge cutoff
2026-02-16
Created
Jul 9, 2026
Reasoning
Default MediumMaxXhighHighMediumLowNone
Publication status
Hugging Face: not mappedLicense: not publishedParameter count: not published
Modalities
Input · FileInput · ImageInput · TextOutput · Text
Generation controls
Include reasoningMax completion tokensMax tokensReasoningReasoning effortResponse formatSeedStructured outputsTool choiceToolsVerbosity
Capability scores
43.2
Agentic index
Better than 78% of models compared
76.7
Coding index
Better than 93% of models compared
42.1
Intelligence index
Better than 87% of models compared