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Anthropic's unreleased Model 4 shows massive performance gains

By PulseAugur Editorial · [1 sources] ·

METR has revealed details about Anthropic's unreleased Model 4, which was trained between September and October of 2026. This model achieved a score of 178.6 on the AI capability index. This represents a significant leap in performance, nearly doubling the improvement seen between Anthropic's previous models, Opus 4.6 and Mythos 5. AI

IMPACT This benchmark suggests a significant acceleration in AI model capabilities, potentially influencing future development and competitive landscapes.

RANK_REASON The cluster reports on a benchmark score for an unreleased model from a major AI lab, which is a research milestone. [lever_c_demoted from research: ic=1 ai=1.0]

Read on r/singularity →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

Anthropic's unreleased Model 4 shows massive performance gains

How we ranked this

Signal score
4 / 100
Composite score across the factors below. Higher = stronger signal that this story matters right now.
Newsworthiness bucket
Tool
The cluster reports on a benchmark score for an unreleased model from a major AI lab, which is a research milestone. [lever_c_demoted from research: ic=1 ai=1.0]
Source corroboration
Single-source cluster
Only one publisher covered this so far. Single-source stories can still rank when the publisher is high-authority, but they lack cross-source corroboration.
Topics
model release, product
Editorial topic classification. Feeds into how the story surfaces on /topic/<slug> hub pages and into the per-entity coverage mix.
AI-industry relevance
High
Clearly on-topic for AI-industry coverage.
Story freshness
Breaking (< 6h)
Fresh story with cross-source coverage still developing. Ranking may shift as more sources report.

Full methodology in our editorial standards.

COVERAGE [1]

  1. r/singularity TIER_2 English(EN) · /u/ResultBackground2450 ·

    METR reveals Anthropic's unreleased Model 4, trained in September–October 2026, scored 178.6 on the AI capability index, a jump nearly 90% as large as the entire improvement from Opus 4.6 to Mythos 5.

    <table> <tr><td> <a href="https://www.reddit.com/r/singularity/comments/1xorf5c/metr_reveals_anthropics_unreleased_model_4/"> <img alt="METR reveals Anthropic's unreleased Model 4, trained in September–October 2026, scored 178.6 on the AI capability index, a jump nearly 90% as la…

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