A developer released tsc-rs, a Rust port of the TypeScript compiler, checker, and language server, claiming all 181,711 ported Go tests pass. OpenAI's GPT-5.6 Sol and GPT 6 Astra spent over $400,000 in tokens without exceeding roughly 84% compatibility, while Opus 5.5 via Claude Code reached a working version in 10 hours, starting from scratch rather than reusing Codex models' code. Total Opus 5.5 spend was about $24,047.
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