GPT-5.6 Terra

OPENAI Developer Architecture Profile

OpenRouter ↗HuggingFace ↗

Intelligence (ELO)1479Chatbot Arena Verified

Max Context Limit1,050,000Max Out: 128,000 tokens

Prompt Caching90% OFF$0.20 / 1M cached

Standard API / 1M$14.00🧠 Deep Reasoner

Model Capabilities & Contract SLAs

Coding & Logic
Fictional
Reasoning
Agentic
📋 Strict JSON Schema
🛠️ Native Tool Calling
🧠 Extended Test-Time Reasoning

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...

Granular Pricing Matrix

Input Tokens (Standard Prompt)$2.00 / 1M

⚡ Cached Input (Prompt Cache Read)90% OFF$0.20 / 1M

Output Tokens (Completion)$12.00 / 1M

Pricing data via OpenRouter. Sync: 10/2/2026

Evaluate Competitors

VS Engine MatchupGPT-5.6 Terra vs OpenAI: GPT-5.6 Terra Pro VS Engine MatchupGPT-5.6 Terra vs Anthropic: Claude Opus Latest VS Engine MatchupGPT-5.6 Terra vs Google: Gemini 2.5 Flash (batch)VS Engine MatchupGPT-5.6 Terra vs OpenAI: GPT-4o (2024-05-13)VS Engine MatchupGPT-5.6 Terra vs Google: Nano Banana Pro (Gemini 3 Pro Image)VS Engine MatchupGPT-5.6 Terra vs Anthropic: Claude Fable Latest