MODEL SIGNAL · OPENAI
GPT-5.6
GPT-5.6 is an upcoming frontier model from OpenAI featuring a 1.5-million token context window, slated for a staggered release to trusted partners in late June 2026.
CATEGORYGeneral
CONTEXT1500000
RELEASEDJune 28, 2026
Key Features
- 1.5 million token context window
- Staggered, customer-by-customer rollout strategy
- Subject to US government safety oversight and restricted initial access
Read the Model Signal report →
The Model Signal report for GPT-5.6 is still compounding. It synthesizes automatically from Signal + Noise wire coverage and the provider announcement — check back as the wire mentions this model.