OpenAI’s secret weapon underneath Codex
SMRTR summary
OpenAI's secret weapon isn't ChatGPT or Codex — it's the open-source agent harness powering both. After enterprise backlash over runaway token costs (some developers hit $20K/month), OpenAI optimized its harness, inference layer, and API stack. The results: GPT-5.6 Sol beats Claude on coding benchmarks using 54% fewer tokens, and GPT-5.5 Luna costs 80% less than Sol.
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