OpenAI·GPT

GPT-5.6

A three-tier series—Sol, Terra, and Luna—covering flagship, balanced, and cost-efficient capability levels.

CurrentLanguageReasoningCodingAgentMultimodalWeights not released

MODEL NUMBER005

Specifications

Only published specifications are shown.

Architecture

Undisclosed

Input modalities

Text · Image

Open weights

Status

Current

A three-tier series—Sol, Terra, and Luna—covering flagship, balanced, and cost-efficient capability levels.

This generation separated model versioning from durable capability tiers and incorporated multi-agent coordination at its highest effort level.

Compared with GPT-5.5 ↗

PreviousGPT-5.5— · 1M ctx

CurrentGPT-5.6— · — ctx

New capabilities Adjustable reasoning Agent

Adjustable reasoningCodingAgentComputer use

2026-06-26Preview

GPT-5.6 Sol, Terra, and Luna entered limited preview.

2026-07-09General release

GPT-5.6 reached general availability across ChatGPT, Codex, and API.

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