Big AI labs literally let you use their secret models for free.
They need real humans to test them before they launch. This happens on a site called Arena AI. You do not have to wait for the future. You can use Claude Sonnet 5 right now. You get full access to Deepseek V4
DeepSeek Harness hit 105,000 GitHub stars in 2 days.
There's a free open-source coding tool growing faster than almost any project ever. We tested it against Claude Code with the same prompt: → DeepSeek built a full website plus a game in 11 minutes → Total cost: 5 cents
DeepSeek V4 Flash just beat its own Pro version on all 9 agent benchmarks.
There's a free model outscoring the paid one it came from. Same size. Same architecture. I ran 50 builds side by side. Here's what I found: → One benchmark jumped from 7.3 to 54.4. Same model, just
DeepSeek Harness just gave Claude Code a serious new rival.
But faster doesn’t automatically mean better. I ran both on the same build. DeepSeek Harness: → Finished in ~11 minutes → Fast first draft → More playful output → Open source → Highly customizable Claude Code:
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