GPT-5.6 Luna is not good.
I benchmarked Cursor's GPT-5.6 Luna vs Composer 2.5 vs Grok 4.6, running each model 5 times on the same real FastAPI repository.
The results were pretty brutal for Luna.
Composer 2.5: 5/5 successful runs
Grok 4.6: 5/5 successful runs
GPT-5.6 Luna: needed 7 runs to get 5 successes
Luna failed twice at the dumbest possible step: opening the PR.
It checked whether `gh` was installed, saw that it wasn’t, and basically said: “welp, guess we’re done.” No investigation, or attempts to use another method.
Luna was the cheapest model in my benchmark.
It was also the worst-performing one.
Has anyone else used Luna for real coding tasks? How has it performed for you?
Note: most of Luna's input tokens are billed as cache writes.
Good day to you all. I don't normally do this but as a last attempt to make "X" work for my business I would kind ask you all to like and share this post as much as possible. I will be ever so grateful 🙏🏻
Check out Gas Electric Meter Box Door Latch Lock Repair Kit With / Without Key - UK Made https://t.co/1indz5equf #eBay via @eBay_UK
A bit of fun
League One 2026/27 predictions 🔮
🏆 Leicester champions
⬆️ Luton automatic
🎯 Play-offs: Wednesday (🤮), Huddersfield, Plymouth & Stockport
👀 Dark horse: MK Dons
Full 1–24 table + team-by-team previews. Who’s too high or too low?
#LeagueOne#EFL#EFLLeagueOne
Part two: positions 9–24 and the relegation battle 👇
⬇️ My bottom two: Accrington Stanley & Newport County
These are pre-season predictions, not certainties. Which club will prove me most wrong?
#LeagueTwo#EFL#EFLLeagueTwo
League Two 2026/27 predictions 🔮
🏆 Salford City champions
⬆️ Port Vale & Chesterfield automatic
🎯 Play-offs: York, Bristol Rovers, Barnet & Exeter
👀 Dark horse: Exeter City
Full 1–24 table + every club preview. Who’s too high or too low?
#LeagueTwo#EFL#EFLLeagueTwo
A bit of fun
League One 2026/27 predictions 🔮
🏆 Leicester champions
⬆️ Luton automatic
🎯 Play-offs: Wednesday (🤮), Huddersfield, Plymouth & Stockport
👀 Dark horse: MK Dons
Full 1–24 table + team-by-team previews. Who’s too high or too low?
#LeagueOne#EFL#EFLLeagueOne
Part 2: the rest of my League One predictions 👇
📊 Positions 9–24
⚠️ Relegation picks: Cambridge, Burton, AFC Wimbledon & Bromley
Pre-season calls, not certainties. Which team will prove me most wrong?
#LeagueOne#EFL#EFLLeagueOne