On 26.06.2026 OpenAI disclosed a GPT‑5.6 lineup consisting of three models — Sol, Terra and Luna — and published initial pricing and capability claims.

Model positioning and cost

OpenAI presented Sol as the flagship, positioned for agentic coding, biological applications and cybersecurity tasks. Terra is said to match GPT‑5.5 performance at roughly half the cost, while Luna targets fast, inexpensive routine workloads.

• Sol: pricing listed as $5/$30 per million tokens.
• Terra: pricing listed as $2.50/$15 per million tokens.
• Luna: pricing listed as $1/$6 per million tokens.

The company claims Luna’s price point places it near leading Chinese models on cost, marking a more direct competitive stance on pricing.

Performance features and deployment

Sol includes an ultra mode designed to orchestrate subagents for parallelized work. OpenAI also announced a planned Cerebras deployment in July 2026 that, according to the company, will enable up to 750 tokens per second, described as 4–15 times faster than Opus 4.8 on similar tasks.

Regulatory interaction and previews

Following a presidential directive signed on 02.06.2026 requiring pre‑release model reviews, OpenAI shared plans with the U.S. government and conducted a limited preview reportedly involving about 20 companies. The company and several peers have expressed reservations about mandatory review procedures while complying with requests.

Benchmarks and market outlook

On Terminal‑Bench 2.1, OpenAI reports Sol achieving 91.9% in ultra mode, with some commentators noting it surpasses Claude Mythos 5 on that benchmark. Observers caution that pre‑release benchmarks are often subject to variability and selective presentation.

Terra’s combination of GPT‑5.5‑level performance and lower cost could make it the most adopted option, contingent on real‑world token consumption and latency. The ultra mode approach aligns with broader industry trends toward agentic and multi‑agent workflows, though initial pricing and efficiency at scale remain open questions.

Release timeline and naming notes

OpenAI expects broader availability in July 2026, with current testing confined to closed environments. The company has not commented on reported references to cryptocurrency projects in the chosen model names.