GPT 5.6 Luna Max vs Sol Medium: Cheaper but Struggles with Shippable Code
alexcovo_eth · x · 2026-08-05
A developer compared GPT 5.6 Luna Max and Sol Medium across multiple sessions over two days.
- Cost & Limits: Luna is significantly cheaper, averaging $1.20/session compared to Sol's $29. However, Luna consumes more tokens, which impacts subscription rate limits.
- Code Quality: Despite the low cost, Luna failed to produce shippable code for the developer's use cases, forcing rework and making the cost savings an illusion.
- Context Handling: As conversations grew longer, Luna tended to ignore initial instructions and got lost on basic tasks, whereas Sol performed stably. A review of their outputs by Opus 5 confirmed Luna's quality deficits.
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