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OpenAI announces InstructGPT and makes it the API's default model

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Announced InstructGPT and switched the API's default model to it

Why it matters

OpenAI itself wrote that it unlocked capabilities that had been hard to draw out through prompt engineering alone

Source — Primary sources first; secondary reports are labelled “Press”

Officialopenai.comhttps://openai.com/index/instruction-following/

Added in Week 35, 2026 · See that week

On the map — ① Prompt Engineering line

  1. Previous stopFLAN
  2. This record · stopInstructGPT
  3. Next stopZero-shot CoT
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In the model family tree — GPT family · 23 versions

  1. Earlier versionGPT-3
  2. This recordInstructGPT
  3. Later versionChatGPT
See the whole GPT family

Same week

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Nearby on the same axis

Chain-of-Thought Prompting Elicits Reasoning in Large Language ModelsPaperOpenAI publishes the InstructGPT paper on arXivPaperGoogle Research presents Self-ConsistencyPaperDeepMind presents Selection-InferencePaper