Opus 5.5 unblocks a 4-month ts-rust port in 10 hours where GPT-6 Astra stalled at 85%

EricBuess · x · 2026-09-26

Developer theo reports a TypeScript→Rust port he worked on for 4 months: GPT-5.6 Sol reached 35% test pass rate, GPT-6 Astra 85%, both stalling in loops for days. With Opus 5.5's practically unlimited tokens, a single "/goal finish the port and make it faster" quickly unblocked what Astra was stuck on; the port now works and Opus has been grinding on performance for 24 hours straight. He says it may make the project actually viable.

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