GPT 5.6 Terra
gpt-5.6-terraGPT-5.6 is OpenAI's newest flagship reasoning family, released in 2026 across named variants (Luna, Sol, Terra). Terra is a configurable reasoning-and-coding variant of GPT-5.6 offered through OpenAI's Codex line, carrying vision and tool-use for agentic software engineering.
Best for
Characteristics
Modalities
Use cases
Anthropic
Yes
Chat Completions
Responses Api
Yes
Provider
OpenAI
Context Window
1M
Available Access
Prices shown per 1M tokens.
Input
Rp. 5.306
$0.29 USD
Output
Rp. 31.839
$1.76 USD
Cache
Rp. 1.531
$0.08 USD
All prices are estimates and subject to change.
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gpt-5.6-lunaGPT-5.6 is OpenAI's latest flagship reasoning-generation family announced in 2026, shipping in several LLM variants (Sol, Terra, Luna). Luna is a variant of GPT-5.6 tuned within OpenAI's Codex line and positioned as a capable general reasoning-and-coding configuration of the family.