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Anthropic document says Claude Mythos 5 cannot replace human scientists or achieve 2x AI research acceleration

Story Overview

Anthropic's internal document on Claude Mythos 5 highlights that the model still trails senior human researchers and engineers on core tasks, even after gains over Opus 4.7 and 4.8 in targeted benchmarks for cybersecurity, biology, and long-horizon work.

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Lisan al Gaib
Nathan Lambert#70
Original post
Lisan al Gaib@scaling01#1064inTech

Anthropic: "Claude Mythos 5 does not seem close to being able to substitute for our Research Scientists and Research Engineers"

10:13 AM · Jun 9, 2026 · 75K Views
Open Question

Limits on automated research speed

The assessment finds no sustained 2x acceleration in AI progress and echoes the April 2026 system card conclusion that Mythos 5 has not crossed the automated AI-R&D threshold.

Developer Impact

Access split with a safer sibling model

Mythos 5 remains invitation-only via Project Glasswing while the related Claude Fable 5 ships publicly with stricter safety constraints for general reasoning and engineering use.

Sentiment

Some users praised Anthropic's report for realistically noting that Claude Mythos 5 cannot replace research scientists due to the messy creativity involved, while others sarcastically commented on its implications.

Pos
57.1%
Neg
42.9%
16 comments with sentiment.
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Lisan al Gaib@scaling01

"Mythos 5 is likely unable to fully and reliably automate R&D for frontier projects spanning multiple weeks"

Lisan al Gaib@scaling01

Anthropic: "Claude Mythos 5 does not seem close to being able to substitute for our Research Scientists and Research Engineers"

1dViews 19.5KLikes 237Bookmarks 27
Nathan Lambert@natolambert

@scaling01 yeah and better pull up the ladder too if that R&D problem thats failing is academic AI research

Lisan al Gaib@scaling01

"Mythos 5 is likely unable to fully and reliably automate R&D for frontier projects spanning multiple weeks"

1dViews 2.5KLikes 42Bookmarks 1
my name is fred@__lightyear__

@scaling01 timelines lengthened

1dViews 265Likes 4Bookmarks 1
Matt Gibson@MattGibsonMusic

This is actually the important calibration.

Mythos can be wildly useful and still not substitute for strong researchers.

Those are different claims.

Long-horizon execution ≠ scientific judgment. Parallel agents ≠ research taste. More tokens ≠ epistemic authority. A 9-hour artifact ≠ a verified discovery.

The danger is not that the model is useless.

The danger is users treating impressive autonomy as proof of truth.

Capability is GAS until it survives reality testing.

cc @ericweinstein who is championing the public outcry of federal government cuts in scientific research. We need MORE scientists to validate AI. It is NOT SMARTER THAN US.)

1dViews 1.1KLikes 1Bookmarks 1
Latest Developments in AI@DevelopmentsAI

@scaling01 It is the Agent1 from Openbrain. Early days of singularity.

1dViews 30Likes 1Bookmarks 1
Cajun Bobby@brsgr4049

@scaling01 Big difference between replacing human engineers entirely and getting more output from half the headcount. The latter still causes a social crisis and is already plausible

1dViews 419Likes 1
Reyaa@snr_boost

@scaling01 "AntHroPic sTopPed hIrInG L5 aNd BeLoW"

1dViews 776
nous@NousVault

@scaling01 just not yet, maybe on mythos 10

1dViews 66
Mattia Apicella@MattiaApic91321

It can't replace the top 0.1% researchers picked after 10 interview rounds at the most resource-intensive AI lab on Earth… sure. But that’s not exactly comforting. Should we just relax while a machine went from “severe cognitive deficits” in 2018 to “yeah it’s impressive but it can’t yet replace the ~5,000 people out of 8 billion who dedicated their lives to outperforming everyone else” in 2026? Are we on the same planet where the average person’s closest friend peaks mentally while doomscrolling TikTok?

23hViews 48
Patty@Patty_H93

@__lightyear__ @scaling01

1dViews 45
FateOfMuffins@FateOfMuffins

@scaling01 So it's possibly capable to fully and reliably automate R&D for frontier projects spanning *a single week*

1dViews 33
Tony@Tony54381404

@scaling01 Unable to do tasks spanning multiple weeks🤔 Maybe it is just a memory problem?

1dViews 30
rajveer@rajveerbach

@scaling01 Loops...:(

1dViews 18
David J.@lordofblocks

@scaling01 Of course it cannot replace research scientists yet. Frontier work is still messy and creative.

1dViews 12
Steven Collard@stalmico

@scaling01 mythos 5 sounds like a metal album

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