The $5 is so they can see if open weights models are worth using, not so they can use it for a month. (Which you can't; The quota runs out way sooner than a month for any serious usage. Still worth the price of entry.)
If you use DeepSeek v4 Flash as a daily driver, with an occasional usage of DeepSeek V4 Pro and Glam 5.2 when necessary, the monthly quota practically never runs out.
Getting the pay-as-you-go plan from DeepSeek is also a good alternative. When motivation strikes you never get slowed down by quota, and it's cheap enough that even with mostly DeepSeek V4 Pro it's price-competitive with a $5/month subscription. Depending on how bursty your usage pattern is it might even be cheaper
True, but OpenCode Go gives 6x tokens on Flash and 1.5x tokens on DeepSeek Pro. After exhausting the monthly quota, Flash price is the same as directly from DeepSeek, while Pro is 4x pricier.