• 3 min read
OpenAI Previews GPT-5.6 Sol Under Heavy Export Controls
With Sol leading the new multi-tier family, government rules are slowing down the rollout of OpenAI's smartest model, but early tests show it competing directly with Mythos and Opus.
OpenAIGPT-5.6 SolClaude OpusMythos

Summary
OpenAI has previewed its new GPT-5.6 Sol model under US government export restrictions. The update introduces a split-tier model structure including Sol, Terra, and Luna. Early benchmarks on Terminal-Bench show Sol outperforming previous models and competing directly with Claude Opus and Mythos.
The Breakdown
- 1OpenAI has kicked off a limited preview of its new GPT-5.6 model family, with the flagship Sol model leading the charge. However, due to strict U.S. government safety requests and export controls, the rollout is highly restricted, leading to deployment delays for global developers.
- 2When it comes to raw coding tests, GPT-5.6 Sol is built to go head-to-head with top-tier models like Claude Opus 4.8 and the new Mythos Preview. Early benchmarks show Sol holding its own on command-line tasks while using significantly fewer tokens.
- 3For dev teams and operators running autonomous agents, Sol offers a high-performance reasoning mode for tricky coding work. However, the tight export curbs mean most teams will have to wait for the rollout to reach their regions.
- 4This release highlights a new trend where frontier AI labs must balance rapid model development with strict national security oversight. OpenAI is navigating these rules by separating their models into tiers to make serving them easier.
- 5With pricing now officially confirmed, OpenAI is charging $5.00 per million input and $30.00 per million output tokens for GPT-5.6 Sol. Mid-tier Terra sits at $2.50/$15.00, while the budget-friendly Luna model drops input costs down to $1.00 per million tokens.
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