I find 5.3 very impressive TBH. Bigger jump than Opus 4.6.

But this here is excellent value, if they offer it as part of their subscription coding plan. Paying by token could really add up. I did about 20 minutes of work and it cost me $1.50USD, and it's more expensive than Kimi 2.5.

Still 1/10th the cost of Opus 4.5 or Opus 4.6 when paying by the token.

The Pro and Max plans can use it. Pro has 1 concurrent session.