I think API is fine, likely only subscription is affected. Not to mention trivial heuristics to differentiate repeated API calls / same data and potential CLI usage although that would be true malice.

It seemed to me that it was performing better through opencode using API but did not test extensively.

If SWE Bench is public then Anthropic is at a minimum probably also looking at their SWE bench scores when making changes, I'd trust more a tracker which runs a private benchmark not known to Anthropic.