I was getting dangerously close to my weekly Claude Code limit last night so I had Claude set up Qwen3.6 with llama.cpp and OpenCode. Honestly it's a great (free!) alternative to Claude Code--certainly more than good enough for a lot of smaller less complex tasks. I'm excited to try this new version. The fact that open-source models are so close to the frontier is very impressive.
Do you have a feel for how it Qwen 3.6 compares to Sonnet 4.6? B/C in reality, that's what we use a lot. If we just use Opus 4.7 for everything code related, we'd have a monthly bill 10-20 times higher than using Sonnet where we can.
In my experience Sonnet bills can be higher than Opus because it churns a lot more trying to get things right.
Example from my fairly simple but agentic benchmark:
Opus 4.7, 25/25, 81c: https://sql-benchmark.nicklothian.com/?highlight=anthropic_c...
Opus 4.6, 24/25, 61c: https://sql-benchmark.nicklothian.com/?highlight=anthropic_c...
Sonnet 4.6: 24/25, 41c: https://sql-benchmark.nicklothian.com/?highlight=anthropic_c...
I only tested the free OpenRouter version of Qwen 3.6 Plus, and it scored 23/25: https://sql-benchmark.nicklothian.com/?highlight=qwen_qwen3....
This doesn't quite show Opus cheaper, but it isn't the 10-20 times more either. Harder tasks close the gap even further.