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GPT-5.1 becomes ChatGPT's adaptive default across Instant and Thinking tiers

OpenAI released GPT-5.1 Instant and GPT-5.1 Thinking, adding adaptive reasoning and making the new generation ChatGPT's default model family.

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CURRENT ASSESSMENT · REVISION 1
TOWARD DOOM40confidence 89/100

Why it moved the index

A verified flagship version improved adaptive reasoning and complex-task persistence while becoming the default across a massive consumer deployment.

Assessment history

  1. R1
    Toward 40 · confidence 89

    New exact flagship tiers and default deployment absent from durable context.

    11 Aug 2026

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  1. DoomBench assesses “GPT-5.1 becomes ChatGPT's adaptive default across Instant and Thinking tiers” as evidence moving toward doom, with magnitude 40 and confidence 89 out of 100 in the capability gains category.

  2. The DoomBench assessment of “GPT-5.1 becomes ChatGPT's adaptive default across Instant and Thinking tiers” is based on reporting from OpenAI and records the editorial rationale, source quality, attribution, and revision history.

  3. DoomBench summarizes “GPT-5.1 becomes ChatGPT's adaptive default across Instant and Thinking tiers” as follows: OpenAI released GPT-5.1 Instant and GPT-5.1 Thinking, adding adaptive reasoning and making the new generation ChatGPT's...

    https://www.doombench.com/news/gpt-5-1-becomes-chatgpt-s-adaptive-default-across-instant-and-thinking-tiers-2025-11-12