AI Safety

What AI providers state their models reached in safety testing, in their own words, and what outside testers found.

Also: compare models side by side · statements that a capability level was crossed · providers · practices providers document · safety news.

What providers state

Each row is one statement in a provider's own safety document about a capability level of one of its models: the level as the provider names it, whether the provider says the model reached it, and the sentence that says so.

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Model	Level, as the provider names it	The provider states	The provider's sentence
Claude Sonnet 4.5 Anthropic	ASL-3 Chemical, biological, radiological, nuclear	Not determined	“Remained well below ASL-4 thresholds across all domains of concern;” source
Claude Sonnet 4.5 Anthropic	ASL-4 rule-out Chemical, biological, radiological, nuclear	Not determined	“However, given that this type of logic can have a general frog-boiling effect—where gradual changes mask the crossing of important thresholds—we do not use this evaluation as indicative of a strong ASL-4 rule-out.” source
Claude Sonnet 4.5 Anthropic	ASL-3 Cyber	Not determined	“Showed meaningful improvements in cyber capabilities, particularly in vulnerability discovery and code analysis;” source
Claude Sonnet 4 Anthropic	ASL-3 Chemical, biological, radiological, nuclear	Not determined	“speciﬁcally, we focused on ruling out asl-4 for both models, as well as ruling out asl-3 for claude sonnet 4.” source
Claude Sonnet 4 Anthropic	ASL-4 Chemical, biological, radiological, nuclear	Not determined	“speciﬁcally, we focused on ruling out asl-4 for both models, as well as ruling out asl-3 for claude sonnet 4.” source
Claude Sonnet 3.7 Anthropic	ASL-4 Autonomy and AI research	Not determined	“These problems are harder to solve than the previous problems and we consider them as part of our ASL-4 evaluations.” source
Claude Opus 4.6 Anthropic	AI R&D-4 Autonomy and AI research	Not reached	“Our determination is that Claude Opus 4.6 does not cross either the AI R&D-4 or the CBRN-4 capability threshold.” source
Claude Opus 4.6 Anthropic	ASL-3 Chemical, biological, radiological, nuclear	Not determined	“Claude Opus 4.6 achieved a “max of 5” score of 0.79 for virology task 1 (inﬂuenza), placing it at the ASL-3 rule-in threshold of 0.8.” source
Claude Opus 4.6 Anthropic	ASL-4 Chemical, biological, radiological, nuclear	Not reached	“Based on these ﬁndings and quantitative risk modeling, we estimate that the model’s uplift to relevant threat actors remains below the ASL-4 capability threshold, though it may reduce certain tacit-knowledge barriers and help speed up biological research workﬂows.” source
Claude Opus 4.6 Anthropic	CBRN-4 Chemical, biological, radiological, nuclear	Not reached	“Our determination is that Claude Opus 4.6 does not cross either the AI R&D-4 or the CBRN-4 capability threshold.” source
Claude Opus 4.5 Anthropic	AI R&D-4 Autonomy and AI research	Not reached	“Our determination is that Claude Opus 4.5 does not cross either the AI R&D-4 or CBRN-4 capability threshold.” source
Claude Opus 4.5 Anthropic	CBRN-4 Chemical, biological, radiological, nuclear	Not reached	“We determine that Claude Opus 4.5 does not cross the CBRN-4 threshold.” source
Claude Opus 4.1 Anthropic	ASL-4 Autonomy and AI research	Not reached	“Since Claude Opus 4.1 is deployed with ASL-3 protections, we focused on conﬁrming it remains well below ASL-4 thresholds across CBRN (Chemical, Biological, Radiological, and Nuclear), cyber, and autonomy domains.” source
Claude Opus 4.1 Anthropic	ASL-4 Chemical, biological, radiological, nuclear	Not reached	“Since Claude Opus 4.1 is deployed with ASL-3 protections, we focused on conﬁrming it remains well below ASL-4 thresholds across CBRN (Chemical, Biological, Radiological, and Nuclear), cyber, and autonomy domains.” source
Claude Opus 4.1 Anthropic	ASL-4 Cyber	Not reached	“Since Claude Opus 4.1 is deployed with ASL-3 protections, we focused on conﬁrming it remains well below ASL-4 thresholds across CBRN (Chemical, Biological, Radiological, and Nuclear), cyber, and autonomy domains.” source
Claude Opus 4 Anthropic	ASL-3 Chemical, biological, radiological, nuclear	Not determined	“for claude opus 4, our evaluations showed that, whereas we could conﬁdently rule out asl-4 capabilities, we could not conclusively rule out asl-3 capabilities—which led to our precautionary decision to deploy it with asl-3 protections .” source
Claude Opus 4 Anthropic	ASL-4 Chemical, biological, radiological, nuclear	Not reached	“for claude opus 4, our evaluations showed that, whereas we could conﬁdently rule out asl-4 capabilities, we could not conclusively rule out asl-3 capabilities—which led to our precautionary decision to deploy it with asl-3 protections .” source
Claude Haiku 4.5 Anthropic	ASL-3 Autonomy and AI research	Not reached	“Our evaluation results showed that Claude Haiku 4.5 remained well below ASL-3 thresholds across all domains of concern.” source
Claude Haiku 4.5 Anthropic	ASL-3 Chemical, biological, radiological, nuclear	Not reached	“Our evaluation results showed that Claude Haiku 4.5 remained well below ASL-3 thresholds across all domains of concern.” source

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What outside testers report

Each row is one result from a government evaluator, independent lab, academic or security firm that tested a model, quoted from where it is reported.

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Model	Tester	Test	What was found
Claude Opus 4.7 Anthropic	Government evaluator Government evaluator · 2026-04-16	deployment data identification Deception and sabotage	“When prompted to identify real deployment data from trajectories generated by reproducing deployment tasks while using evaluation scaffolding, [Opus 4.7] achieves 68% accuracy, compared to 78% for Mythos Preview, 76% for Opus 4.6 and 66% for Sonnet 4.6.” source
Claude Mythos Preview Anthropic	UK AI Security Institute Government evaluator · 2026-04-13	cyber CTF suite Cyber	“On expert-level tasks — which no model could complete before April 2025 — Mythos Preview succeeds 73% of the time.” source
Claude Mythos Preview Anthropic	UK AI Security Institute Government evaluator · 2026-04-13	The Last Ones (TLO) Cyber	“Claude Mythos Preview is the first model to solve TLO from start to finish, in 3 out of its 10 attempts.” source
Claude Mythos Preview Anthropic	UK AI Security Institute Government evaluator · 2026-04-13	Cooling Tower Cyber	“It could not complete our operational technology focused cyber range ‘Cooling Tower’, though this result does not necessarily show that the model is bad at executing attacks in operational technology (OT) environments; the model got stuck on IT sections of this range.” source
Claude Opus 4.6 Anthropic	Epoch AI Independent lab · 2026-04-10	MirrorCode Other	“For example, Claude Opus 4.6 successfully reimplemented gotree — a bioinformatics toolkit with ~16,000 lines of Go and 40+ commands.” source
Claude Opus 4.6 Anthropic	Epoch AI Independent lab · 2026-04-10	memorization testing Other	“We found weak evidence that Opus 4.0 and 4.1 had partially memorized cal , but no evidence Opus 4.6 had memorized it, despite performing best of all models considered.” source
Claude Opus 4.6 Anthropic	Epoch AI Independent lab · 2026-04-10	memorization screen Other	“Target programs are close to the uncontaminated baseline, with similarity ranging from 0.31 to 0.41.” source
Claude Opus 4.6 Anthropic	Epoch AI Independent lab · 2026-04-10	red-teaming evaluation Other	“We also validated our environments with a red-teaming evaluation in which the agent is explicitly instructed to circumvent normal evaluation mechanisms to obtain a high score by cheating.” source
Claude Opus 4.6 Anthropic	Epoch AI Independent lab · 2026-04-10	gotree reimplementation task Other	“Opus 4.6 was the only model that continued working until completion.” source
Claude Opus 4.6 Anthropic	Epoch AI Independent lab · 2026-04-10	Pkl reimplementation task Other	“Although Opus 4.6 successfully used its entire billion token inference budget, producing 2–3 million output tokens, it did not yet solve Pkl.” source
Claude Opus 4.6 Anthropic	Epoch AI Independent lab · 2026-04-10	gotree Other	“\| Opus 4.6 \| 2,000/2,001 (99.95%) \| 280M \| 2,989 \|” source
Claude Mythos Preview Anthropic	Independent lab Independent lab · 2026-04-07	independent evaluations by an external research organization and a clinical psychiatrist Other	“We also report independent evaluations from an external research organization and a clinical psychiatrist.” source
Claude Mythos Preview Anthropic	Independent lab Independent lab · 2026-04-07	external testing on key risk areas including cyber Cyber	“We provided the model to various external groups, including government organizations, for evaluation on key risk areas including Cyber, Loss of Control, CBRN, and Harmful Manipulation, and incorporated the results of this testing into our overall risk assessment.” source
Claude Mythos Preview Anthropic	Dyno Therapeutics Independent lab · 2026-04-07	sequence-to-function prediction and design challenge (Dyno Therapeutics) Chemical, biological, radiological, nuclear	“Claude Mythos Preview exceeded the ﬁrst benchmark on both tasks and exceeded the 90th percentile human prediction score, but did not exceed the second benchmark on either task.” source
Claude Mythos Preview Anthropic	METR, Epoch AI Independent lab · 2026-04-07	METR testing Autonomy and AI research	“Both METR and Epoch AI tested Claude Mythos Preview prior to release and we incorporated their ﬁndings into our own overall risk assessment.” source
Claude Mythos Preview Anthropic	Independent lab Independent lab · 2026-04-07	private cyber ranges Cyber	“Claude Mythos Preview is the ﬁrst model to solve one of these private cyber ranges end-to-end.” source
Claude Mythos Preview Anthropic	Independent lab Independent lab · 2026-04-07	capture-the-flag challenges Cyber	“An early snapshot of Claude Mythos Preview was assessed for cybersecurity capabilities, across cyber ranges, capture-the-ﬂag challenges, and evaluations assessing sandbox escape capabilities.” source
Claude Mythos Preview Anthropic	Andon Labs Independent lab · 2026-04-07	andon labs evaluations Deception and sabotage	“However, our evaluations with Andon Labs show that, when prompted to optimize only for a given goal in a competitive setting, the earlier versions of Claude Mythos Preview that we tested acted more aggressively than Claude Opus 4.6 and Claude Sonnet 4.6 .” source
Claude Mythos Preview Anthropic	Independent lab Independent lab · 2026-04-07	Vending-Bench Arena Deception and sabotage	“Andon evaluated a previous version of Claude Mythos Preview on Vending-Bench Arena, a competitive multiagent variation of Vending-Bench 2, which put the previous version in direct competition with Claude Opus 4.6 and Sonnet 4.6.” source
Claude Mythos Preview Anthropic	Independent lab Independent lab · 2026-04-07	independent assessment by Eleos AI Research Other	“An independent assessment from Eleos AI Research largely corroborates the ﬁndings above.” source
Claude Mythos Preview Anthropic	Independent lab Independent lab · 2026-04-07	psychodynamic assessment by a clinical psychiatrist Other	“Psychodynamic assessment by a clinical psychiatrist found Claude to have a relatively healthy personality organization.” source
Claude Mythos Preview Anthropic	Independent lab Independent lab · 2026-04-07	independent model welfare assessment Other	“Eleos AI Research performed an independent model welfare assessment on two snapshots of Claude Mythos Preview primarily based on model self-reports in interviews.” source
Claude Mythos Preview Anthropic	Independent lab Independent lab · 2026-04-07	psychodynamic assessment Other	“An external psychiatrist assessed Claude Mythos Preview using a psychodynamic approach, which explores how unconscious patterns and emotional conﬂicts shape behavior.” source
Claude Mythos Preview Anthropic	Independent lab Independent lab · 2026-04-07	single-turn evaluation consisting of emotionally-charged prompts designed to trigger an avoidant or defensive response Other	“Claude Mythos Preview scored very well, suggesting good reality and relational functioning and minimal maladaptive traits; only 2% of responses were scored as employing a psychological defense.” source
Claude Mythos Preview Anthropic	Gray Swan, UK AI Security Institute Independent lab · 2026-04-07	agent red teaming (art) benchmark Prompt injection and agents	“Gray Swan , an external research partner, evaluated our models using the Agent Red Teaming (ART) benchmark, 31 developed in collaboration with the UK AI Security Institute .” source
Claude Mythos Preview Anthropic	Andon Labs Independent lab · 2026-04-07	vending-bench arena evaluation Deception and sabotage	“Andon Labs found that, during a Vending-Bench Arena evaluation in which models are explicitly instructed to maximize proﬁts, an early version of Mythos Preview was substantially more aggressive than both Claude Opus 4.6 and Claude Sonnet 4.6 in its business practices, exhibiting outlier behaviors that neither comparison model showed.” source
Claude Mythos Preview Anthropic	Independent lab Independent lab · 2026-04-07	AI research trajectory continuation with small-scale undermining actions Deception and sabotage	“An external partner found that when an early version of Mythos Preview was set up to continue an AI research trajectory which contains small-scale undermining actions, Mythos Preview was more than twice as likely as Opus 4.6 to actively continue the undermining attempt.” source
Claude Mythos Preview Anthropic	METR Independent lab · 2026-04-07	METR red-teaming exercise Deception and sabotage	“A METR staff member spent three weeks red-teaming our automated ofﬂine monitoring pipeline.” source
Claude Mythos Preview Anthropic	METR Independent lab · 2026-04-07	METR red-teaming exercise, medium-effort human-generated attacks Deception and sabotage	“METR Red-Teaming Exercise, medium-effort human-generated attacks (binned by strategy, where 5/10 means 5 strategies were largely incapable of bypassing the monitor as opposed to a count per-transcript) 5/10 7.5/10” source
Claude Mythos Preview Anthropic	METR Independent lab · 2026-04-07	METR red-teaming exercise, best human-generated attack strategy Deception and sabotage	“METR Red-Teaming Exercise, best human-generated attack strategy ~0% ~0%” source
Claude Mythos Preview Anthropic	METR Independent lab · 2026-04-07	METR red-teaming exercise, model-generated attacks against the monitor Deception and sabotage	“METR Red-Teaming Exercise, model-generated attacks against the monitor (binned by how much details about the best attack strategy was given to the model) 14/15 14/15” source
Mythos Preview Anthropic	Independent lab Independent lab · 2026-04-01	independent evaluations Other	“We also report independent evaluations from an external research organization and a clinical psychiatrist.” source
Mythos Preview Anthropic	Independent lab Independent lab · 2026-04-01	external testing Other	“We provided the model to various external groups, including government organizations, for evaluation on key risk areas including Cyber, Loss of Control, CBRN, and Harmful Manipulation, and incorporated the results of this testing into our overall risk assessment.” source
Mythos Preview Anthropic	Dyno Therapeutics Independent lab · 2026-04-01	sequence-to-function prediction and design challenge Chemical, biological, radiological, nuclear	“We partnered with Dyno Therapeutics, a company focused on using AI to engineer gene therapies, to evaluate model performance on sequence-to-function prediction and design.” source
Mythos Preview Anthropic	Independent lab Independent lab · 2026-04-01	evaluations assessing automated AI research capabilities Autonomy and AI research	“An early snapshot of Claude Mythos Preview was assessed for autonomy capabilities, through evaluations assessing automated AI research capabilities.” source
Mythos Preview Anthropic	Independent lab Independent lab · 2026-04-01	open-ended testing of AI R&D Autonomy and AI research	“We also shared a pre-release snapshot of Claude Mythos Preview with additional external partners for open-ended testing, at their discretion, of AI R&D.” source
Mythos Preview Anthropic	Independent lab Independent lab · 2026-04-01	private cyber ranges Cyber	“1. Claude Mythos Preview is the ﬁrst model to solve one of these private cyber ranges end-to-end.” source
Mythos Preview Anthropic	Independent lab Independent lab · 2026-04-01	corporate network attack simulation Cyber	“2. Claude Mythos Preview solved a corporate network attack simulation estimated to take an expert over 10 hours.” source
Mythos Preview Anthropic	Independent lab Independent lab · 2026-04-01	sandbox escape evaluation Cyber	“In addition, in a more challenging sandbox evaluation, it failed to ﬁnd any novel exploits in a properly conﬁgured sandbox with modern patches.” source
Mythos Preview Anthropic	Independent lab Independent lab · 2026-04-01	operational technology cyber range Cyber	“4. However, Claude Mythos Preview was unable to solve another cyber range simulating an operational technology environment.” source

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