A reference to OpenAI's next model, "GPT-5.6," has surfaced in ChatGPT's internal code. As of June 25, 2026 there is no official announcement, and reports suggest it may have been made available as a limited preview to certain Enterprise partner companies.
June 25, 2026 · OpenAI
"GPT-5.6" Surfaces in Leaks — But OpenAI Has Said Nothing
Identifiers like gpt-5.6-preview and gpt-5.6-thinking appeared in ChatGPT's code and internal routing — hinting at a limited Enterprise preview. For now, the entire story rests on traces, not an announcement.
89%
Prediction-market odds of a late-June release — a forecast, not a fact
0
Official announcements, dates or benchmarks published
~2 mo
Since GPT-5.5 shipped (~April 2026) — an accelerating cycle
Rumored context window jump
Confirmed for 5.5 · rumor for 5.6 — bigger context alone isn't enough; retrieval & prioritization are key
Where things stand: confirmed vs rumor
GPT-5.5 — official
Latest flagship model
1M-token context
$5 in / $30 out per million
Knowledge cutoff Dec 2025
Focus: reasoning & coding
GPT-5.6 — unverified rumor
Identifier / leak only
1.5M–2M context (rumored)
Price unknown
Same cutoff (rumored)
Stronger agentic coding, SVG/frontend gen
Two readings of the leak
Optimists say
A "preview" label — like o1-preview and GPT-4.5-Preview — often signals a capability jump in reasoning, coding, vision and SVG. At ~1/5 the price of Fable 5, it could win everyday agentic workflows.
Skeptics warn
With zero official information it's all rumor. Bigger context alone isn't enough, and a silent rollout makes evaluation hard — plus worries the GPT-5.5 "goblin" alignment issue could recur.
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