GPT-5.6 Terra

OpenAI's GPT-5.6 model for strong intelligence with a balanced cost profile.

Balanced Intelligence1.05M ContextReasoning & Tools

Context window

1,050,000 tokens

Max output

128,000 tokens

Input

$1.8$2.00

10% off

1M tokens

Output

$10.8$12.00

10% off

1M tokens

Model Codegpt-5.6-terra

Playground

Model Code

gpt-5.6-terra

Reference inputs

Reference Images0/5

Click or drag

Enter your prompt here...

Output

No output yet

Pricing

Plan	Context Window	Max Output	Input	Output	Cache Write	Cache Read
gpt-5.6-terra	1.05M tokens	-	$1.8$2.0010% off 1M tokens	$10.8$12.0010% off 1M tokens	$2.25$2.5010% off 1M tokens	$0.18$0.2010% off 1M tokens

Long Context Input · $3.6 · 1M tokens

Long Context Output · $16.2 · 1M tokens

Long Context Cached Input · $0.36 · 1M tokens

Long Context Cache Write · $4.5 · 1M tokens

Cache read or cached input pricing applies to reused prompt tokens.

README

GPT-5.6 Terra is the balanced tier in the GPT-5.6 family. It offers strong reasoning, tool use, and a 1.05M-token context window for enterprise workloads that need a practical balance of capability and cost.

GPT-5.6 Terra is designed for workloads that balance intelligence and cost. It roughly corresponds to the mini tier used in earlier GPT-5 families.
Use the Responses API for reasoning, tool-calling, and multi-turn workflows. The GPT-5.6 family supports reasoning effort controls from `none` through `max`, so teams can select an appropriate quality, latency, and cost tradeoff.
GPT-5.6 supports programmatic tool calling, persisted reasoning, and explicit prompt caching. Use `gpt-5.6-sol` when frontier capability is the priority, or `gpt-5.6-luna` for cost-sensitive, high-volume work.

API

Use the API docs for request format, parameters, and integration details.

OpenAI's GPT-5.6 model for strong intelligence with a balanced cost profile.

Model Code

gpt-5.6-terra

View API Docs

API

Endpoint

POST /v1/chat/completions

Authentication

Authorization: Bearer YOUR_REACH_API_KEY
Content-Type: application/json

Example

curl -X POST "https://direct.reachapi.ai/v1/chat/completions" \
  -H "Authorization: Bearer YOUR_REACH_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "YOUR_MODEL_ID",
    "messages": [
      {
        "role": "user",
        "content": "Introduce ReachAPI in one sentence."
      }
    ],
    "temperature": 0.2
  }'

Related Models

Other models from the same vendor

GPT-5.6 Luna

OpenAI's GPT-5.6 model for efficient, cost-sensitive, high-volume workloads.

GPT-5.6 Sol

OpenAI's GPT-5.6 flagship model for the most demanding production reasoning, coding, and agent workflows.

GPT-5.5

OpenAI's newest frontier model for the most complex coding, reasoning, and professional workflows.

GPT-5.4

OpenAI's frontier model for complex professional, coding, and agentic work at scale.

GPT-5.4 Mini

OpenAI's strongest mini model for coding, computer use, and high-volume agent tasks.

GPT-5.3 Codex

OpenAI's most capable agentic coding model to date.

GPT-5.2

OpenAI's stronger GPT-5-family model for professional, general-purpose, and agentic work.

GPT-5.1

OpenAI's flagship model for coding and agentic tasks with configurable reasoning.

GPT-5.1 Codex

OpenAI's GPT-5.1 variant optimized for agentic coding in Codex workflows.

GPT-5

OpenAI's previous intelligent reasoning model for coding and agentic tasks.

GPT-5 Mini

OpenAI's faster, cost-efficient GPT-5 variant for low-latency and high-volume work.

GPT Image 2

OpenAI's state-of-the-art image generation model for high-quality creation and editing with text and image inputs.

GPT Image 2 Async

ReachAPI's asynchronous GPT Image 2 workflow for task-based image generation and editing with callback-ready results.