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Benefit Ledger · verified · Computer Science

ChatGPT launches and becomes a default professional writing and coding tool

On 30 November 2022 OpenAI released ChatGPT, a GPT-3.5 conversational product, as a free research preview. Within months it was in daily use for software, documentation, and knowledge work, creating the interface that later coding agents still copy.

Tier 4 HistoricMethodology 0.2
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Current score

+13.77

30 base · Historic (tier 4 of 5, 30 pts)
× 0.8500 attribution · Primary causal contribution
× 0.7500 evidence · Multiple independent confirmations
× 0.9000 realization · Realized outcome
× 0.8000 durability · Useful for many years
Event-level product before credit split: 13.77

The product that made frontier language models a daily professional tool is Historic (tier 4): it transformed knowledge work globally. Missing GDP accounting is an evidence question, not a base-tier cap. Attribution to the shipped ChatGPT/GPT-3.5 system (0.85). Evidence is the launch plus years of workplace studies and deployments (0.75). Realization is global professional use (0.90). The interface pattern persists even as later models replaced GPT-3.5 (0.80).

What happened

The launch post described ChatGPT as a sibling of InstructGPT, trained with RLHF, offered free to collect feedback. It was not framed as a scientific discovery. It was a product: a browser chat that non-specialists could use immediately for code, prose, and analysis. Independent accounts (The Verge, MIT Technology Review) documented the unexpectedly fast workplace adoption; years of surveys, field experiments, controlled productivity studies, and corporate deployments followed. This ledger entry scores the deployment of that professional tool, not monthly active users. Harm from fabricated citations and related misuse is recorded on separate events. Later models replaced GPT-3.5 inside the product; credit for the launch stays with the ChatGPT/GPT-3.5 system that shipped on 30 November 2022.

Model attribution

+13.77

GPT

GPT-3.5 conversational product released 30 November 2022 as the public ChatGPT interface.

The launched system was ChatGPT, a GPT-3.5 sibling of InstructGPT. Later GPT-4 and GPT-5.x replacements are later events.

Attribution 0.8500 · Credit share 100% · OpenAI

Claims

  • OpenAI publicly launched ChatGPT on 30 November 2022 as a free GPT-3.5 conversational research preview.

    outcome · supported

  • ChatGPT rapidly entered professional coding and writing workflows.

    outcome · supported

  • Launch-week user counts are themselves a NetGoodIndex score.

    significance · disputed

Sources

primary sources

independent sources

Secondary domains: Engineering

Revision history

  • 13 Sep 2026 · 0.00 → 2.68

    Imported September 2026 mathematics events under methodology 0.1 credit-unit rules.

  • 14 Sep 2026 · 2.68 → 13.77

    Methodology 0.2: Historic technology event; workplace evidence belongs in the evidence multiplier, not a Major cap.

  • 17 Sep 2026 · 13.77 → 13.77

    Methodology 0.2: Historic technology event; workplace evidence belongs in the evidence multiplier, not a Major cap.

  • 18 Sep 2026 · 13.77 → 13.77

    Methodology 0.2: Historic technology event; workplace evidence belongs in the evidence multiplier, not a Major cap.

  • 19 Sep 2026 · 13.77 → 13.77

    Methodology 0.2: Historic technology event; workplace evidence belongs in the evidence multiplier, not a Major cap.

  • 20 Sep 2026 · 13.77 → 13.77

    Ingest update: added a follow-up source.

  • 21 Sep 2026 · 13.77 → 13.77

    Methodology 0.2: Historic technology event; workplace evidence belongs in the evidence multiplier, not a Major cap.

  • 6 Oct 2026 · 13.77 → 13.77

    Methodology 0.2: Historic technology event; workplace evidence belongs in the evidence multiplier, not a Major cap.

  • 7 Oct 2026 · 13.77 → 13.77

    Methodology 0.2: Historic technology event; workplace evidence belongs in the evidence multiplier, not a Major cap.

  • 11 Oct 2026 · 13.77 → 13.77

    Methodology 0.2: Historic technology event; workplace evidence belongs in the evidence multiplier, not a Major cap.

  • 11 Oct 2026 · 13.77 → 13.77

    Methodology 0.2: Historic technology event; workplace evidence belongs in the evidence multiplier, not a Major cap.

  • 21 Oct 2026 · 13.77 → 13.77

    Methodology 0.2: Historic technology event; workplace evidence belongs in the evidence multiplier, not a Major cap.

  • 24 Oct 2026 · 13.77 → 13.77

    Methodology 0.2: Historic technology event; workplace evidence belongs in the evidence multiplier, not a Major cap.

  • 27 Oct 2026 · 13.77 → 13.77

    Methodology 0.2: Historic technology event; workplace evidence belongs in the evidence multiplier, not a Major cap.

  • 28 Oct 2026 · 13.77 → 13.77

    Methodology 0.2: Historic technology event; workplace evidence belongs in the evidence multiplier, not a Major cap.

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