GPT-5.6 Terra

proprietary

GPT-5.6 Terra is designed for workloads that balance intelligence and cost. It roughly corresponds to the mini model tier used in earlier GPT-5 families. Reasoning.effort supports: none, low, medium (default), high, xhigh, and max.

Intelligence
Reasoning
Speed
Context
1.1M
Max output
128K
Input price
$2/1M tokens
Output price
$12/1M tokens

Capabilities

Reasoning & Interaction
Reasoning
Tool Calling
Output Control
Structured Output
JSON Mode
Infrastructure
Streaming
Batch Processing

Details

Model IDgpt-5.6-terra
Provider OpenAI
Creator openai
Familygpt-5.6
Licenseproprietary
Statusactive
Typechat
Input modalitiestext, image
Output modalitiestext
Open weightNo
Parameters—
Architecture—
Context window1.1M tokens
Max input922K tokens
Max output128K tokens
Reasoning tokensYes
Knowledge cutoff
Release date
Sourceofficial

Tools

Web Searchweb_search
Search the web for information
File Searchfile_search
Search across uploaded files
Image Generationimage_generation
Generate images inline
Code Interpretercode_interpreter
Execute code in a sandbox
Hosted Shellhosted_shell
Run shell commands in a container
Apply Patchapply_patch
Apply code patches to files
Skillsskills
Use built-in skill modules
Computer Usecomputer_use
Control a virtual desktop
MCPmcp
Connect to Model Context Protocol servers
Tool Searchtool_search
Discover and use tools

Endpoints

Chat CompletionsPOST
Generate chat responses with messageshttps://api.openai.com/v1/chat/completions
ResponsesPOST
Stateful multi-turn conversationshttps://api.openai.com/v1/responses
BatchPOST
Async batch processing at lower costhttps://api.openai.com/v1/batches

Pricing

Text tokensPer 1M tokens
InputOutputCached input30m write12h write
Standard$2$12$0.2$2.5$5
Batch$1$6$0.1$1.25$2.5
Fast$4$24$0.4$5$10

Family Comparison: gpt-5.6

ModelContextMax outPricing
GPT-5.6 Luna1.1M128K$0.2$1.2
GPT-5.6 Terra1.1M128K$2$12
GPT-5.6 Sol1.1M128K$4$20
GPT-5.6 Cyber400K128K$12.5$75

API

GET/v1/models/openai/gpt-5.6-terra

GPT-5.6 Terra

gpt-5.6-terra

GPT-5.6 Terra is designed for workloads that balance intelligence and cost. It roughly corresponds to the mini model tier used in earlier GPT-5 families. Reasoning.effort supports: none, low, medium (default), high, xhigh, and max.

gpt-5.6-terra
Changes · 5 entries
gpt-5.6-terracreateca7a400Nov 2, 2026, 03:02 AM
gpt-5.6-terraupdate4e8b6afOct 21, 2026, 06:35 AM
pricingtiers[{"label":"Text tokens","unit":"Per 1M tokens","columns":...→[{"label":"Text tokens","unit":"Per 1M tokens","columns":...
gpt-5.6-terraupdate118451aSep 24, 2026, 07:08 AM
namegpt-5.6-terra→GPT-5.6 Terra
pricingtiers[{"label":"Text tokens","unit":"Per 1M tokens","columns":...→[{"label":"Text tokens","unit":"Per 1M tokens","columns":...batch input$1batch output$6
tools["function_calling"]→["web_search","file_search","image_generation","code_inte...
endpoints["responses","chat_completions","batch"]→["chat_completions","responses","batch"]
descriptionGPT-5.6 Terra is designed for workloads that balance inte...
taglineGPT-5.6 model that balances intelligence and cost
snapshots["gpt-5.6-terra"]
gpt-5.6-terraupdate39b8745Jul 31, 2026, 06:11 AM
pricinginput$2.5→$2output$15→$12cached input$0.25→$0.2tiers[{"label":"Text tokens","unit":"Per 1M tokens","columns":...→[{"label":"Text tokens","unit":"Per 1M tokens","columns":...
gpt-5.6-terracreate105275dJul 10, 2026, 12:00 AM