IMPLICATOR
OpenAI released GPT-6 Sol and GPT-6 Luna on Tuesday with per-token prices cut by half or more from their GPT-5.6 predecessors. GPT-6 Sol costs $2 per million input tokens and $10 per million output tokens. Independent testing published on September 22 found that Sol was cheaper per task up to a point, while Claude Opus 5.5 reached higher scores.
What Changed
- OpenAI released GPT-6 Sol and GPT-6 Luna on September 22, with Sol at $2 per million input tokens and $10 per million output tokens, down from $4 and $20.
- The comparison baseline is GPT-5.6 Sol's promotional rate, guaranteed only through November 21.
- In Artificial Analysis's same-harness test, Sol at maximum effort scored 47.5 for $1.06 a task, below Claude Opus 5.5 at its default setting, 51.2 for $1.34.
- Sol matched Opus 5.5 on business workflows at 40% of the cost but trailed on Terminal-Bench 4.0, 43.9% to 52.5%.
AI-generated summary, reviewed by an editor. More on our AI guidelines.
The price sheet
Sol's new rates replace GPT-5.6 Sol's $4 input and $20 output prices per million tokens. GPT-6 Luna costs $0.10 for input and $0.50 for output, down from $0.20 and $1.20 for GPT-5.6 Luna.
The comparison uses GPT-5.6 Sol's promotional pricing, guaranteed only through November 21. GPT-6 Sol now matches Claude Sonnet 5 across input, output and cached-input rates. Cached input receives a 90% discount, cutting Sol's rate to $0.20 per million tokens.
Marcus Schuler
Editor-in-Chief and founder of Implicator.ai. Former ARD correspondent and senior broadcast journalist with 10+ years covering tech. Writes daily briefings on policy and market developments. Based in San Francisco. E-mail: editor@implicator.ai
