← GPT-6.1 Sol Guide · Updated Sept 30, 2026

AI Model Guide · Sept 2026

GPT-6.1 Sol FAQ

Is GPT-6.1 Sol free?

No. At launch it is not in free Chat. Access is via paid ChatGPT Work & Codex tiers (Plus/Pro/Business/Enterprise/Edu) or pay-per-token API ($2/$10 per 1M tokens). See pricing.

When was GPT-6.1 Sol released?

Announced September 29, 2026 — about a week after GPT-6 Sol, which it replaces.

What is the API model id?

gpt-6.1-sol on the OpenAI API; openai/gpt-6.1-sol on OpenRouter. See how to use.

How is it different from GPT-6 Sol and Luna?

6.1 Sol beats 6 Sol everywhere at lower cost (e.g. +6.4pp on DeepSWE, 2× on science) and sits between Luna (cheap/fast) and Astra (flagship). Full table: comparison.

Is there a system card / safety report?

Yes — OpenAI published a system card addendum plus deployment-safety notes (alignment closer to Astra; no reviewer-bypass attempts observed). Link via the official announcement.