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gpt-5.6-terra

Model IDgpt-5.6-terra

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Model introduction

GPT-5.6 Terra is the balanced tier in OpenAI's GPT-5.6 family, positioned between Sol's maximum capability and Luna's lower operating cost.

Model capabilities

Specifications come from the cited model material. Catalog tags help identify access features; use the source documentation for exact limits.

OpenAI compatibleResponses APIAnthropic compatibleGemini compatibleImage generationVisionPrompt cacheReasoning

Verified specifications

Official positioning
GPT-5.6 model balancing intelligence and cost
Context window
1,050,000 tokens
Maximum output
128,000 tokens
Knowledge cutoff
2026-02-16
Input / output
Text, image / Text

Sources: OpenAI GPT-5.6 Terra model documentation

Model pricing and access

Prices are read directly from the MoleAPI console catalog and shown by current billing group and context tier.

Your final charge follows the account group shown in the console.
Live pricing source

Pricing table

USD / 1M tokens
Standardx1defaultInput $2 · Output $12
standard

Length ≤ 272K

Input
$2/ 1M
Output
$12/ 1M
Cache read
$0.2/ 1M
Cache write
$2.5/ 1M
Image input
$8/ 1M
Image output
$30/ 1M
long_context
Input
$4/ 1M
Output
$18/ 1M
Cache read
$0.4/ 1M
Cache write
$5/ 1M
Image input
$8/ 1M
Image output
$30/ 1M
Discountx0.8discountInput $1.6 · Output $9.6
standard

Length ≤ 272K

Input
$1.6/ 1M
Output
$9.6/ 1M
Cache read
$0.16/ 1M
Cache write
$2/ 1M
Image input
$6.4/ 1M
Image output
$24/ 1M
long_context
Input
$3.2/ 1M
Output
$14.4/ 1M
Cache read
$0.32/ 1M
Cache write
$4/ 1M
Image input
$6.4/ 1M
Image output
$24/ 1M
Relayx0.3relayInput $0.6 · Output $3.6
standard

Length ≤ 272K

Input
$0.6/ 1M
Output
$3.6/ 1M
Cache read
$0.06/ 1M
Cache write
$0.75/ 1M
Image input
$2.4/ 1M
Image output
$9/ 1M
long_context
Input
$1.2/ 1M
Output
$5.4/ 1M
Cache read
$0.12/ 1M
Cache write
$1.5/ 1M
Image input
$2.4/ 1M
Image output
$9/ 1M
Temporary (availability may vary)x0.1tempInput $0.2 · Output $1.2
standard

Length ≤ 272K

Input
$0.2/ 1M
Output
$1.2/ 1M
Cache read
$0.02/ 1M
Cache write
$0.25/ 1M
Image input
$0.8/ 1M
Image output
$3/ 1M
long_context
Input
$0.4/ 1M
Output
$1.8/ 1M
Cache read
$0.04/ 1M
Cache write
$0.5/ 1M
Image input
$0.8/ 1M
Image output
$3/ 1M

Access protocols

Available billing groups: Standard, Discount, Relay, Temporary (availability may vary)

openai
POST
/v1/chat/completions
openai-response
POST
/v1/responses
anthropic
POST
/v1/messages
gemini
POST
/v1beta/models/{model}:generateContent
image-generation
POST
/v1/images/generations
openai-response-compact
POST
/v1/responses/compact
openai-alpha-search
POST
/v1/alpha/search

Complete model guide

Prepared from vendor sources and independently reviewed. · 2026-07-28

GPT-5.6 Terra is OpenAI’s balanced GPT-5.6 model for everyday work, positioned between the flagship Sol model and the cost-efficient Luna model. OpenAI presents the GPT-5.6 family for agentic workflows, coding, knowledge work, computer use, and tool orchestration. [6]

Positioning and core capabilities

GPT-5.6 Terra is the balanced tier in OpenAI’s generally available GPT-5.6 model family. It is positioned for workloads that need a balance of capability and cost rather than the flagship positioning of Sol. [6]

OpenAI describes GPT-5.6 as improving work per token across coding, knowledge work, tool use, computer use, and security-oriented tasks. [6]

Capabilities and specs

GPT-5.6 supports Programmatic Tool Calling in the Responses API, enabling lightweight programs to coordinate tools, process intermediate results, monitor progress, and select subsequent actions. [6]

OpenAI also describes a multi-agent beta in the Responses API for building workflows that coordinate parallel agents. [6]

SpecificationDetails
Model family positionBalanced model for everyday work [6]
Family availabilityGenerally available [6]
Tool orchestrationProgrammatic Tool Calling in the Responses API [6]
Multi-agent workflowsResponses API multi-agent beta [6]

Use cases

GPT-5.6 Terra is positioned for everyday professional work that combines reasoning with controlled operating cost. [6]

The GPT-5.6 family’s stated strengths support coding assistance, knowledge-work automation, computer-use workflows, and agentic systems that coordinate external tools and intermediate results. [6]

Material limitations

Terra is not OpenAI’s flagship GPT-5.6 tier; Sol occupies that position, while Luna is the family’s most cost-efficient model. [6]

Terra’s product positioning centers on balancing capability and cost, rather than maximizing the capability profile represented by Sol. [6]

Sources

Code examples

These examples use MoleAPI's Responses API endpoint and run after you replace the API key.

curl https://api.moleapi.com/v1/responses \
  -H "Authorization: Bearer $MOLEAPI_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-5.6-terra",
    "input": "Explain this problem step by step."
  }'

More related models

More OpenAI models

OpenAI

gpt-5.6-luna

$0.2 / 1M tokens / $1.2 / 1M tokens

OpenAI

gpt-5.6-sol

$5 / 1M tokens / $30 / 1M tokens

OpenAI

gpt-5.5

$5 / 1M tokens / $30 / 1M tokens

Frequently asked questions

How is gpt-5.6-terra priced?

This page reads prices from the MoleAPI console API and updates with model prices, context tiers, and account groups.

How can I access gpt-5.6-terra?

Protocols and endpoints come from the supported_endpoint_types field in the MoleAPI model catalog.

How do I switch an existing project to gpt-5.6-terra?

Keep the MoleAPI API address and key, replace the model parameter with the model ID on this page, then check protocol-specific parameter differences.

Where do the gpt-5.6-terra model details come from?

Capabilities and limitations are checked against OpenAI and the other cited pages. Pricing and available protocols come only from the MoleAPI console.