Release dates
— GPT-5.6 Sol, Terra, and Luna entered limited preview. ↗ — GPT-5.6 reached general availability across ChatGPT, Codex, and API. ↗
GPT-5.6
A three-tier series—Sol, Terra, and Luna—covering flagship, balanced, and cost-efficient capability levels.
MODEL NUMBER005
- First public date
- 2026-06-26
- Organization
- OpenAI
- Family
- GPT
01
Specifications
Only published specifications are shown.
This record covers multiple tiers. Modalities and capabilities describe the group coverage; support and licensing depend on the individual tier.
- Architecture
- Undisclosed
- Context
- 1,050,000 tokens↗
- Maximum output
- 128,000 tokens↗
- Input modalities
- Text · Image
- Open weights
- No
- Status
- Current
GPT-5.6 SolGPT-5.6 TerraGPT-5.6 Luna
02
Overview
Why it mattered
This generation separated model versioning from durable capability tiers and incorporated multi-agent coordination at its highest effort level.
PreviousGPT-5.5— · 1.05M ctx
CurrentGPT-5.6— · 1.05M ctx
04
Architecture & capabilities
Model capabilities
CodingAgent
Connected tools
Computer use
API features
Adjustable reasoning
05
Release history
GPT-5.6 Sol, Terra, and Luna entered limited preview.
View sourceGPT-5.6 reached general availability across ChatGPT, Codex, and API.
View source06
Related models
Select a card to view the related model.
07
Sources
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