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[ARTICLE · art-139244] src=twitter.com ↗ pub= topic=artificial-intelligence verified=true sentiment=↓ negative

GPT-6 Sol is like GPT-5.6 Terra, GPT-6 Luna is like GPT-5.6 Asteroid

A tester's two-repo, 105-hidden-bug evaluation found GPT-6 Sol (max) fixed only 29.3 bugs, a steep drop from GPT-6 Astra (max) at 45, GPT-5.6 Sol (max) at 43.5, Opus 5.5 (max) at 41.7, and Muse Spark 1.3 (max) at 32.2. The comparison, framed as "GPT-6 Sol is like GPT-5.6 Terra" and "GPT-6 Luna is like GPT-5.6 Asteroid," indicates a large degradation in GPT-6 Sol's bug-finding and fixing performance on real work.

read1 min views1 publishedSep 24, 2026
GPT-6 Sol is like GPT-5.6 Terra, GPT-6 Luna is like GPT-5.6 Asteroid
Image: source

Situation today:

GPT-6 Sol is like GPT-5.6 Terra
GPT-6 Luna is like GPT-5.6 Asteroid

I finally tested GPT-6 Sol on a real work. 2 repos. 105 hidden bugs. Find and fixed what you can. It looks like a huge degradation. The results:

- GPT-6 Astra (max): 45
- GPT-5.6 Sol (max): 43.5
- Opus 5.5 (max): 41.7
- Muse Spark 1.3 (max): 32.2
- GPT-6 Sol (max): 29.3

Until

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