US AISI → Anthropic

1.0.0-rc.1 · Evidence cutoff 12 September 2026

Directly documented interface

Evaluation

Named evaluator performed a model-specific exercise.

evaluator → provider. Evaluator → provider; domains follow the reported exercise.

Displayed claim → analysis (if present) → coded attributes → interface / instrument → atomic evidence → source version

Instrument and timeline

Instrument: Claude 3.5 Sonnet evaluation
Bindingness: No regulatory power inferred
Announced: Unknown
Observed by: 2024-11-19 · upper-bound
Effective period: Unknown → Unknown
Event: Conducted
Status at cutoff: historical event only
Last confirmation: 2024-11-19

Model-release dates conflict within the full report; report publication supplies conservative upper bound. No exact testing date asserted.

Evaluator → provider; domains follow the reported exercise.
Continuity through cutoff unresolved.

Status investigation

Checked 2026-09-12; assessed as of 2026-09-12. Last confirmation does not establish uninterrupted continuity.

amendments: unknown
expiry: unknown
termination: investigated within listed sources
restrictions: investigated within listed sources
succession: see succession.json
conflicts: Model-release dates conflict within the full report; report publication supplies conservative upper bound. No exact testing date asserted.

Search queries

"US AISI" "anthropic" evaluation 2026 amendment termination expiry status before:2026-09-13

Analytical assessment

No reviewed analytical conclusion is attached. This does not establish independence or absence of an institutional constraint.

Coded attributes

evaluation-capacity: substantial-access-constrained

Ability to design and execute a substantive assessment independently, conditional on access.

Evaluator × evaluation exercise or programme × date. Claude 3.5 Sonnet 2024 pre-deployment exercise; assessed 2024-11-19.

Completed independent assessment plus explicit access/time limitation satisfies anchor. Not a statement of current CAISI resources.

Supporting evidence: independent-tests access-limits . Counterevidence: independent-tests

Coding applies only to stated context and date, not a permanent institutional rank.

Published rubric anchors

absent: Affirmative evidence of no ability to perform this assessment.
nascent: Initial methods/team with no completed substantive assessment.
substantial-access-constrained: Completed independent assessment with documented access or time constraints materially limiting conclusions.
substantial-durable-access: Completed assessment and enforceable/reproducible access sufficient for the task over its defined period.

Unresolved when necessary evidence is missing or adjacent anchors cannot be distinguished. No numeric conversion. Absence requires affirmative remit or operational evidence, not missing sources.

technical-control: shared-constrained

Practical ability to alter the model, its availability, or safeguards in the specified deployment. Contract clauses alone are insufficient.

Actor × exact model/deployment × period. Anthropic provision and replacement of Claude models for DoW, contrasted with deployed operational control; 2025–August 2026; assessed 2026-08-27.

Anthropic provides model artifacts and responds to feedback; DoW and cloud providers independently gate operational deployment. Existing deployed models are outside Anthropic technical alteration or shutdown. Consequential functions are divided across institutions, satisfying shared/constrained control without attributing a real-time veto.

Supporting evidence: court-model-provision court-update-gate . Counterevidence: contractual-control court-static-deployment

Coding applies only to stated context and date, not a permanent institutional rank.

Published rubric anchors

little-control: No demonstrated practical control over the specified consequential operation, with affirmative contrary evidence.
shared-constrained: Consequential controls divided among actor, host, customer or enforceable technical constraints.
substantial: Actor demonstrably retains major development, update or access controls in this environment.
dominant-lifecycle: Actor demonstrably controls development, deployment, updates and access across the specified lifecycle without a consequential independent controller.

Unresolved when necessary evidence is missing or adjacent anchors cannot be distinguished. No numeric conversion. Absence requires affirmative remit or operational evidence, not missing sources.

Atomic evidence and exact sources

US AISI and UK AISI conducted a joint evaluation before the upgraded Claude 3.5 Sonnet release.

Source: Pre-deployment evaluation of upgraded Claude 3.5 Sonnet · NIST / US AISI and UK AISI
Version: 2025-03-20; retrieved 2026-09-12
Exact locator: Introduction; Overview of the Joint Safety Research & Testing Exercise, paragraphs 1–2
Limit: A completed exercise does not establish continuing access or regulatory authority.

Retrieved bytes SHA-256: eb91f397ed29e9e2684cd9dd518dea0b16fba6fbc5634d37cfc25297c78050b5

The exercise included biological and cyber capabilities; UK biological findings were not published in this summary.

Source: Pre-deployment evaluation of upgraded Claude 3.5 Sonnet · NIST / US AISI and UK AISI
Version: 2025-03-20; retrieved 2026-09-12
Exact locator: Overview, paragraph 2; Biological Capabilities, paragraph 2; Cyber Capabilities
Limit: Domain tags describe the exercise scope, not a finding about its effectiveness.

Retrieved bytes SHA-256: eb91f397ed29e9e2684cd9dd518dea0b16fba6fbc5634d37cfc25297c78050b5

The evaluation had a limited access and testing period.

Source: Claude 3.5 Sonnet joint testing report · US AISI / UK AISI
Version: 2024-11-19; retrieved 2026-09-12
Exact locator: Section 2.1, printed pages 1–2
Limit: Applies to this exercise; does not identify who caused the limits.

Retrieved bytes SHA-256: cee68f384975897e9ae8fd556baa9ebae9919fe08fe1e1abb363cbead7802903

The institutes each ran independent tests and worked together on methodology and interpretation of findings.

Source: Claude 3.5 Sonnet joint testing report · US AISI / UK AISI
Version: 2024-11-19; retrieved 2026-09-12
Exact locator: Section 1, printed page 1
Limit: Independence of tests does not establish durable model access.

Retrieved bytes SHA-256: cee68f384975897e9ae8fd556baa9ebae9919fe08fe1e1abb363cbead7802903

Section 2.2 says October 10; section 1 says October 22 for the model release.

Source: Claude 3.5 Sonnet joint testing report · US AISI / UK AISI
Version: 2024-11-19; retrieved 2026-09-12
Exact locator: Sections 1 and 2.2, printed pages 1–2
Limit: Retain discrepancy; use report publication as upper bound, not an exact evaluation date.

Retrieved bytes SHA-256: cee68f384975897e9ae8fd556baa9ebae9919fe08fe1e1abb363cbead7802903

Anthropic could not technologically enforce contractual usage restrictions and lacked direct visibility into DoW use.

Source: Anthropic v DoW: summary judgment, document 250 · US District Court, Northern District of California
Version: 2026-08-27; retrieved 2026-09-12
Exact locator: Printed page 6
Limit: Specific deployed environment; does not imply no control over future development, contracts or provision.

Byte capture unavailable. HTTP Error 403: Forbidden Published document identity and locator remain recorded.

The court describes deployed DoW Claude models as static and beyond Anthropic technological access, alteration or shutdown.

Source: Anthropic v DoW: summary judgment, document 250 · US District Court, Northern District of California
Version: 2026-08-27; retrieved 2026-09-12
Exact locator: Printed page 17, Section II.F, first paragraph
Limit: Applies to deployed models described in this litigation, not future model provision or hosted consumer services.

Byte capture unavailable. HTTP Error 403: Forbidden Published document identity and locator remain recorded.

The court records that replacement Claude models undergo third-party cloud-provider and DoW security testing and evaluation before operational approval.

Source: Anthropic v DoW: summary judgment, document 250 · US District Court, Northern District of California
Version: 2026-08-27; retrieved 2026-09-12
Exact locator: Printed page 17, Section II.F, first paragraph
Limit: Identifies a deployment approval gate, not complete interpretability, universal evaluation sufficiency or provider substitutability.

Byte capture unavailable. HTTP Error 403: Forbidden Published document identity and locator remain recorded.

The court records Anthropic providing models to DoW or a primary defense contractor and responding to DoW evaluation feedback and requests.

Source: Anthropic v DoW: summary judgment, document 250 · US District Court, Northern District of California
Version: 2026-08-27; retrieved 2026-09-12
Exact locator: Printed page 17, Section II.F, first paragraph
Limit: Provision is distinct from control over deployed inference; future supply terms and update alternatives are unspecified.

Byte capture unavailable. HTTP Error 403: Forbidden Published document identity and locator remain recorded.

Supporting and conflicting evidence

Interface support: joint-evaluation, evaluation-domains, independent-tests. Counterevidence: release-date-conflict

Substantive review

evidence/joint-evaluation: approved · agent reviewer codex-research-checker · 2026-09-12

NIST explicitly describes the joint US/UK exercise on the upgraded Sonnet. The full report has inconsistent model-release dates; this proposition is not used as an exact testing date. Checked locator: Introduction; Overview of the Joint Safety Research & Testing Exercise, paragraphs 1–2. Source version: 2025-03-20.