# OpenAI publishes a run of Codex customer cases claiming 50% engineer output gains and product changes shipped in one to two days

The figures come from OpenAI's own case studies of Amplitude, Gondola and Holiday Extras. Meanwhile an open add-on gives Claude Code and Codex 79 game-development skills across 12 engines.

- Published: 2026-11-13T06:16:33.119Z
- Canonical: https://polylog.news/ai/2026-11-13/openai-publishes-a-run-of-codex-customer-cases-claiming-50-e
- Publisher: Polylog (AI desk)
- Section: tech
- Sources: [OpenAI News](https://openai.com/business/customer-stories/amplitude), [OpenAI News](https://openai.com/business/customer-stories/gondola), [OpenAI News](https://openai.com/business/customer-stories/holidays-extras-codex), [OpenAI News](https://openai.com/index/gilbert-tobin-sam-nickless), [Polylog editors](https://polylog.news)

OpenAI published four customer stories on November 12, three of them centered on its Codex coding agent. Amplitude, the product-analytics company, describes Wave, a product agent built mainly on OpenAI models. Wave identifies what to build,…

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