GPT-5.6 Sol

Preview

OpenAIFrontierProprietary

Highest-capability GPT-5.6 preview variant, released only to a small vetted cohort after U.S. government review. Reporting positions Sol as the expensive flagship tier of the Sol/Terra/Luna rollout.

Official page ↗

Specifications

License: Proprietary
Weights: Not released
Architecture: unknown
Parameters: Undisclosed
Context window: 1.5M tokens
Max output: 128K tokens
Knowledge cutoff: Jan 31, 2026
Price (in / out, $/M): $5 / $30
Modalities: TextVisionAudioCode

Benchmarks

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Vendor-reported figures are claims until independently verified. See methodology.