There is no Claude 4 Opus model... It's a series of model, of which the strongest is Opus 4.8, and Qwen 3.6 35B-A3b gets 51.5% on Swe-bench pro to Opus 4.8's 69.2%
But it is still available on Google Vertex according to OpenRouter (though it's possible that info is just out of date, it's currently quoting 3tps which is unusably slow): https://openrouter.ai/anthropic/claude-opus-4
