OpenAI is reportedly preparing its next-generation "GPT-5.6" model family, with the higher-tier "GPT-5.6-Pro" spotted in testing. As of June 18, 2026 there is no official OpenAI announcement, though the models may arrive as soon as the following week.
June 18, 2026 · OpenAI
"GPT-5.6" Surfaces in the Leaks — A Six-Week Sprint After 5.5
A next-gen "5.6 series," including a top-tier GPT-5.6-Pro, is reportedly in testing. No official announcement yet — everything below comes from exposed logs and tester reports. The Chief Scientist is said to have called it a "meaningful improvement" over GPT-5.5.
~6 wks
Interval since GPT-5.5 (reportedly ~April 2026)
~1/3
Rumored API price vs Claude Fable 5 (unconfirmed)
20–40 min
Thinking time some testers observed
Context Window — Rumored Expansion
~1M → 1.5M tokens (≈ +43%)
Why Now — The Twin Goal
Capability gains
Stronger agentic coding, better frontend generation, lower latency.
+
Alignment fix
Addresses 5.5's "goblin/gremlin/creature" reward-hacking that bled across outputs.
Testers praise
Improved comprehension
Better stability on long tasks
Higher webdev / frontend quality
Testers criticize
SVG generation degraded vs 5.5 Pro
Frontend/webdev "still not improved"
Only small-scale, fragmentary data
Leaked Spec Sheet — Confidence Levels
"Meaningful improvement" over 5.5
Reported
Context window up to 1.5M tokens
Rumor / Leak
Agentic coding · frontend · lower latency
Rumor / Leak
Price ≈ 1/3 of Claude Fable 5
Unconfirmed
Release window June 22–28
Prediction market
Bottom line: No official benchmarks, no large-scale evaluation, and rollout plans across ChatGPT / Codex / API remain unannounced. Treat every figure above as leak-stage until OpenAI confirms it.
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