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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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
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R1
Toward 40 · confidence 89
New exact flagship tiers and default deployment absent from durable context.
11 Aug 2026
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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.
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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.
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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