GPT-5.6 Terra

The workhorse tier of the GPT-5.6 family: GPT-5.5-class performance at half the price — the default choice when migrating.

Specifications

Item	Value
Model ID	`gpt-5.6-terra`
Vendor	OpenAI
Available on APIYI	2026-07-10
Knowledge cutoff	Not disclosed
Input modalities	Text, Image
Output modalities	Text
Context window	1,000,000 tokens
Billing	Usage-based

Pricing

Prices in USD per 1M tokens ($/1M).

Input	Cached input	Output
$2.5	$0.25	$15

The table shows list prices. Recharge promotions and group discounts stack; the console reflects the actual charge in real time. See Pricing and Recharge promotions.

Tiered pricing

This model is tier-priced by the token size of each request (output price = tier input price × output multiplier):

0 – 272,000 tokens: $2.5/1M input
Above 272,000 tokens: $5/1M input

Endpoints

Endpoint	Path	Supported
`OpenAI Chat Completions`	`POST /v1/chat/completions`	✅
`OpenAI Responses`	`POST /v1/responses`	✅
`Anthropic Messages`	`POST /v1/messages`	—
`Gemini Generate Content`	`POST /v1beta/models/{model}:generateContent`	—
`Image Generations`	`POST /v1/images/generations`	—
`Embeddings`	`POST /v1/embeddings`	—

Billing groups

Group	Multiplier	Notes
`CodexReverse`	0.7×	70% of list price
`Default`	1×	List price
`SVIP`	1×	List price

Some groups carry extra discounts, stackable with recharge bonuses. See Tokens and groups.

Supported features

Feature	Supported
Streaming	✅
Tool calling	✅
Structured outputs	✅
Vision	✅
Prompt caching	✅
Extended thinking	Opt-in

Example request

The example below calls gpt-5.6-terra through OpenAI Chat Completions (/v1/chat/completions). Point base_url at https://api.apiyi.com/v1 — everything else matches the official API.

curl https://api.apiyi.com/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $APIYI_API_KEY" \
  -d '{
    "model": "gpt-5.6-terra",
    "messages": [{"role": "user", "content": "Hello"}]
  }'

Read the key from an environment variable, never hard-coded. In production, issue separate tokens per use case so you can revoke and attribute usage individually.

Launch announcement

Background, benchmarks and migration notes for GPT-5.6 Terra

Compatible Mode

Parameters, usage and best practices

GPT-5.6 Sol

Details for a model in the same family

GPT-5.6 Luna

Details for a model in the same family

Model pricing directory

Live pricing, endpoints and groups for all 308 models

Specs on this page are maintained by hand in models/data/model-details.json; pricing and endpoints come from the live pricing API, updated 2026-07-31 01:30 (UTC+8), specs last verified 2026-07-31.

Pricing Table

OpenAI

Anthropic

Google

xAI

Alibaba

ByteDance

Moonshot

Zhipu

MiniMax

Specifications

Pricing

Tiered pricing

Endpoints

Billing groups

Supported features

Example request

Launch announcement

Compatible Mode

GPT-5.6 Sol

GPT-5.6 Luna

Model pricing directory

​Specifications

​Pricing

​Tiered pricing

​Endpoints

​Billing groups

​Supported features

​Example request

​Related docs

Launch announcement

Compatible Mode

GPT-5.6 Sol

GPT-5.6 Luna

Model pricing directory

Specifications

Pricing

Tiered pricing

Endpoints

Billing groups

Supported features

Example request

Related docs