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I pointed Claude Opus 5.5 at 27 CodinGame code golf puzzles in TypeScript. It cut the total from 24,644 bytes to 6,788, beat Fable 5 by 47% on the shared puzzles, and took the TypeScript record on Mars Lander with a 60-byte program that never reads the lander's state.
I re-ran the 21 CodinGame code golf puzzles from the Opus post with Claude Fable 5. It wrote 24.7% fewer bytes overall, 10,712 down to 8,065: still above the best human TypeScript, but closing the gap fast.
I pointed Opus 4.8 at six CodinGame optimization puzzles. On the travelling salesman it tied the top of the leaderboard; on the open-ended games it reached a sixth or an eighth of the best score and stopped. The thing it's bad at is the CodinGame squeeze, not the solving.
I ran Opus 4.8 against 21 CodinGame code golf puzzles in TypeScript, from easy to hard. It never came close to first place, and usually didn't even beat the best human TypeScript. Here are the numbers.
