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    Asana Completes Five-Year Test Migration in Two Weeks with Codex

    OpenAI states the frontend test switch from Enzyme to React Testing Library took two weeks.

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    13 Sources, 42d ago, first seen 42d ago

    TLDR

    OpenAI posted that Asana completed a frontend test migration from Enzyme to React Testing Library using Codex. The post states the work finished in two weeks after an internal estimate of five years. Posts in the thread add that token costs totaled $12k. Greg Brockman shared the same claim. Multiple engineers replied that the five-year figure was unrealistic before Codex and that a motivated engineer could have completed the task during a short code freeze without AI assistance.

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    13 Sources, first seen 42d ago

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    13 Sources, first seen 42d ago

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    478 comments
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    372 reposts

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    13 Sources

    @WesRothAsana says OpenAI Codex completed an engineering migration it had expected to take at least five years in about two weeks, for roughly $12,000 in model and infrastructure costs. The project: removing Enzyme, an outdated testing system that had become a blocker to upgrading Asana’s frontend stack. The company’s previous staffing plan estimated the migration would cost roughly $6 million. Instead, Asana gave Codex a prompt only five sentences long. Up to four coding agents worked in parallel, each operating in a separate copy of the codebase. A human engineer checked progress roughly twice per day and reviewed every proposed change before approval. Asana says simpler instructions actually worked better than a more elaborate setup. The result: Expected timeline: ≥5 years Actual: 1.5 weeks of engineering effort across 2 calendar weeks Previous staffing estimate: ~$6M Model + infrastructure cost: ~$12K There are probably THOUSANDS of old migrations and rewrites sitting inside companies because nobody can justify spending years on them. If agents make those projects cheap enough to attempt the engineering backlog itself starts changing.
    @OpenAIDevsWith Codex, @asana finished a frontend test migration from Enzyme to React Testing Library in two calendar weeks—a project expected to take five more years. https://openai.com/index/asana/
    @NickADobosIf in 2026 you are estimating any engineering project taking 5 years… not gonna make it. This is so ridiculous of an estimate that I would fire whoever came up with it on the spot
    @sundeep5 years of work in 2 weeks...
    @gdbCodex for code migrations — from literal years to weeks:
    @GergelyOroszRofl that both OpenAI and Asana management believed that it would take FIVE years to migrate Enzyme to React Testing Library. What amusing BS! I imagine it went like this: Manager: “How long will it take? Give me SOMETHING” Dev (annoyed): “FIVE YEARS OK?? Now leave me alone.”
    @kimmonismusCrazy: A migration Asana's own engineers had scoped at five years took OpenAI's Codex agents about a week and a half. The job was ripping out Enzyme, an obsolete React testing framework that blocked every attempt to upgrade the company's frontend and that nobody had been willing to touch, because the estimate ran to five years of engineering and roughly $6 million in staffing. Up to four Codex agents worked in parallel on separate copies of the codebase from a five-sentence prompt, with engineers reviewing their proposals twice a day. The whole thing came in at roughly $12,000 in model and infrastructure costs. So yeah, literally everything is accelerating.
    @sherwinwuThe hidden punchline: the token cost for this migration was only $12k! You don’t need to tokenmaxx / break the bank to land impact with Codex.

    13 Sources

    @WesRothAsana says OpenAI Codex completed an engineering migration it had expected to take at least five years in about two weeks, for roughly $12,000 in model and infrastructure costs. The project: removing Enzyme, an outdated testing system that had become a blocker to upgrading Asana’s frontend stack. The company’s previous staffing plan estimated the migration would cost roughly $6 million. Instead, Asana gave Codex a prompt only five sentences long. Up to four coding agents worked in parallel, each operating in a separate copy of the codebase. A human engineer checked progress roughly twice per day and reviewed every proposed change before approval. Asana says simpler instructions actually worked better than a more elaborate setup. The result: Expected timeline: ≥5 years Actual: 1.5 weeks of engineering effort across 2 calendar weeks Previous staffing estimate: ~$6M Model + infrastructure cost: ~$12K There are probably THOUSANDS of old migrations and rewrites sitting inside companies because nobody can justify spending years on them. If agents make those projects cheap enough to attempt the engineering backlog itself starts changing.
    @OpenAIDevsWith Codex, @asana finished a frontend test migration from Enzyme to React Testing Library in two calendar weeks—a project expected to take five more years. https://openai.com/index/asana/
    @NickADobosIf in 2026 you are estimating any engineering project taking 5 years… not gonna make it. This is so ridiculous of an estimate that I would fire whoever came up with it on the spot
    @sundeep5 years of work in 2 weeks...
    @gdbCodex for code migrations — from literal years to weeks:
    @GergelyOroszRofl that both OpenAI and Asana management believed that it would take FIVE years to migrate Enzyme to React Testing Library. What amusing BS! I imagine it went like this: Manager: “How long will it take? Give me SOMETHING” Dev (annoyed): “FIVE YEARS OK?? Now leave me alone.”
    @kimmonismusCrazy: A migration Asana's own engineers had scoped at five years took OpenAI's Codex agents about a week and a half. The job was ripping out Enzyme, an obsolete React testing framework that blocked every attempt to upgrade the company's frontend and that nobody had been willing to touch, because the estimate ran to five years of engineering and roughly $6 million in staffing. Up to four Codex agents worked in parallel on separate copies of the codebase from a five-sentence prompt, with engineers reviewing their proposals twice a day. The whole thing came in at roughly $12,000 in model and infrastructure costs. So yeah, literally everything is accelerating.
    @sherwinwuThe hidden punchline: the token cost for this migration was only $12k! You don’t need to tokenmaxx / break the bank to land impact with Codex.