Opus 5.5 launch day vs today: same prompt, worse video output
The author reran the same Lander prompt and reference images on Opus 5.5 from launch day and today, reporting rendering glitches, worse bullet physics, missing spacecraft break-apart physics and no camera toggles in today's output, and inspected the code for causes.
Last time we posted that Opus 5.5 got nerfed, we got a lot of criticism, so we ran one more test. We tested Opus 5.5 on launch day and again today using the exact same Lander prompt and reference images. Launch day vs today below : Today’s version has rendering glitches, worse bullet physics, missing spacecraft break-apart physics, no camera toggles, and a worse UI. We also inspected the code and found some questionable implementation choices that explain the regressions. LLMs are non-deterministic, but this isn't a minor variation. The results are clearly worse. Anthropic, what changed? Is this just a marketing strategy for the launch of Fable 5.5?