OpenAI has officially announced GPT-5.6 for ChatGPT users, but the feature is not yet available to the public. The announcement, made through OpenAI’s official GPT-5.6 preview post, confirms three new models called Sol, Terra, and Luna. During this preview, GPT-5.6 is limited to a small group of trusted partner organizations through the API and Codex, with no access inside ChatGPT itself. This is reported from OpenAI’s official announcement and system card, since the AllBetaInfo team does not have hands on access to test GPT-5.6 directly.
What GPT-5.6 Actually Is
GPT-5.6 is not a single model. It is a family of three models under one generation number. Sol is the flagship model built for complex reasoning and long tasks. Terra is a balanced model for everyday work. Luna is the fastest and lowest cost option in the lineup.
OpenAI gave each tier a name instead of only a version number. The number 5.6 marks the generation. Sol, Terra, and Luna mark separate capability tiers that can each update on their own schedule going forward.
Why GPT-5.6 Is Restricted Right Now
GPT-5.6 launched as a limited preview on June 26 2026, not as a normal staged rollout. Access during this preview goes only to roughly 20 trusted partner organizations that were vetted through a government safety review process.
The restriction came at the request of the United States government. OpenAI has stated this arrangement is not its preferred long term approach and plans to work toward broader access. There is no waitlist for individual users to join during this preview period.
ChatGPT users on Free, Plus, Pro, or any other plan do not have a way to request early access. The model picker inside ChatGPT does not include a GPT-5.6 option as of this preview period.
Pricing for Sol, Terra, and Luna
OpenAI has published pricing for all three GPT-5.6 models per one million tokens. Sol costs $5 for input and $30 for output. Terra costs $2.50 for input and $15 for output. Luna costs $1 for input and $6 for output.
Terra offers performance close to GPT-5.5 at roughly half the cost, according to OpenAI. Luna is positioned as the lowest cost entry point in the GPT-5.6 family for high volume tasks.
GPT-5.6 also introduces more predictable prompt caching. Cache writes are billed at 1.25 times the standard input rate, while cached reads keep a 90 percent discount compared to normal input pricing.
New Capabilities in Sol
Sol includes a new max reasoning effort setting that gives the model more time to work through complex problems. OpenAI also introduced an ultra mode, which uses multiple subagents together to handle harder, multi step work faster than a single agent alone.
On the Terminal-Bench 2.1 coding benchmark, Sol reached 88.8 percent, with the Ultra configuration reaching 91.9 percent. OpenAI describes this as a new state of the art result for command line coding workflows that require planning and tool coordination.
Sol also shows measurable gains in biology focused benchmarks, including stronger results than GPT-5.5 on long horizon genomics analysis while using fewer tokens per task.
Platform Availability Right Now
GPT-5.6 is available only through the OpenAI API and through Codex, and only to the approved partner organizations named in the preview. It is not available inside ChatGPT on web, iOS, or Android for any subscription tier.
Developers outside the approved partner group cannot call GPT-5.6 through the API today. OpenAI has stated that broader availability across ChatGPT, Codex, and the API is planned, describing the timeline only as coming weeks, without a confirmed date.
Separately, OpenAI said it will bring Sol to Cerebras hardware in July 2026, offering inference speeds up to 750 tokens per second. This Cerebras access is limited to select enterprise customers and is a separate track from the ChatGPT rollout.
When Regular Users Might Get Access
OpenAI has not given a firm release date for general availability. The company’s own language points only to coming weeks following the June 26 announcement. ChatGPT Plus users would likely see Terra and Luna style models first for daily use, while Pro, Team, and Enterprise users are expected to get access to Sol and its advanced reasoning modes when the wider rollout begins.
International availability has historically lagged behind United States release by weeks or months, and the current government review process adds additional uncertainty to that timeline for GPT-5.6 specifically.
Conclusion
GPT-5.6 exists, has published pricing, and has confirmed benchmark results, but it remains out of reach for ordinary ChatGPT users during this preview period. The next confirmed step will be OpenAI’s announcement of general availability across ChatGPT, Codex, and the API, which the company has only described as coming weeks after the June 26 2026 preview.
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