---
id: "openai/gpt-5.6-terra"
also: ["openai/gpt-5.6-terra-20260709", "requesty/openai/gpt-5.6-terra", "vercel/openai/gpt-5.6-terra"]
card_usd_per_m: "2.0 in, 12.0 out, at openai"
cheapest_list_usd_per_m: "1.0 in, 6.0 out, at openai/flex on openrouter"
cheapest_effective_usd_per_m: "0.3776 in, 13.1993 out, at azure/eu on openrouter"
context: 1050000
max_output: 128000
input: ["file", "image", "text"]
output: ["text"]
released: "2026-07-09"
reasoning: ["max", "xhigh", "high", "medium", "low", "none"]
api: ["/api/v1/chat/completions", "/api/v1/completions", "/api/v1/messages", "/api/v1/responses"]
params: ["include_reasoning", "max_completion_tokens", "max_tokens", "reasoning", "reasoning_effort", "response_format", "seed", "stop", "structured_outputs", "temperature", "tool_choice", "tools", "verbosity"]
endpoints: 22
gateways: "requesty (11), openrouter (8), vercel (3)"
no_training: 21
trains: 0
retains_prompts: 7
intelligence: 32.3000
coding: 76.7000
agentic: 43.2000
---
# OpenAI: GPT-5.6 Terra

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 tasks where capability and cost need to be balanced, offering strong performance at roughly half the cost of Sol.