Microsoft ↔ UK AISI

1.0.0-rc.1 · Evidence cutoff 12 September 2026

Directly documented interface

Formal cooperation

Named parties enter a defined memorandum or research agreement; implementation separately documented.

undirected. undirected

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

Instrument and timeline

Instrument: Formal cooperation
Bindingness: Unknown; not inferred from announcement
Announced: 2026-05-05
Observed by: 2026-05-05 · day
Effective period: Unknown → Unknown
Event: Announced
Status at cutoff: unresolved/unknown
Last confirmation: 2026-05-05

No material conflict recorded; no absence of conflict inferred.

Announcement does not prove implementation, effectiveness or status at cutoff.

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: No material conflict recorded; no absence of conflict inferred.

Search queries

"microsoft" "uk-aisi" cooperation 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 tests establish capacity; explicit limited testing access narrows conclusions. Independently run assessments counters inference of provider-directed findings.

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.

public-authority: limited

Institutionally authorized power to make decisions binding in the specified context.

Institution × legal/operational context × assessed date. February 2024 stated evaluation and advisory remit; assessed 2024-02-09.

Self-described supplementary evaluation and policy-advice remit supports advisory anchor. It does not code the powers of DSIT or UK government as a whole.

Supporting evidence: aisi-remit . Counterevidence:

Historical institutional remit. Later capacity, legislative changes or government powers require separate evidence. Limited denotes advisory remit here, not limited binding authority.

Published rubric anchors

absent: Affirmative remit excludes binding public decisions in this context.
limited: Advisory or delegated bounded public decisions.
substantial: Binding decisions over a significant but bounded function.
binding-operational: Documented binding decision and ability to carry it into operation in the defined function.

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.

information-access: unresolved

Ability to obtain non-public model information independently of provider consent.

Institution × information category × jurisdiction/date. Compulsion of access to non-public frontier checkpoints; assessed 2026-09-12.

A limited voluntary exercise cannot prove absence of all compulsory authority. No jurisdiction-wide classification from this evidence.

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

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

Published rubric anchors

absent: Affirmative evidence excludes access in this context.
voluntary-provider-controlled: Access obtained through provider permission or negotiated instrument.
partial-compulsory: Specific compulsory information powers apply to some requested information.
broad-compulsory: Applicable legal powers reach the information needed for this defined task, subject to stated safeguards.

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

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

In its February 2024 approach document, AISI describes itself as a secondary check rather than a regulator.

Source: AI Safety Institute approach to evaluations · DSIT / AI Safety Institute
Version: published-2024-02-09; retrieved 2026-09-12
Exact locator: A note on evaluations, final paragraph
Limit: Historical stated remit; not an assessment of every governmental power or all powers at September 2026.

Retrieved bytes SHA-256: 3cf1fee953c6819e009c82b58e5340b7e67737a824477c3ceced9ca636be981c

Microsoft announced a research and evaluation agreement with UK AISI.

Source: Microsoft evaluation agreements · Microsoft
Version: 2026-05-05; retrieved 2026-09-12
Exact locator: Opening and UK subsection
Limit: Announcement does not prove implementation, effectiveness or status at cutoff.

Retrieved bytes SHA-256: 8e1809e719e788a829f56e4b473326d0cfa2cd030211e1cba4990beeb4b77c40

Supporting and conflicting evidence

Interface support: e-microsoft-uk-2026. Counterevidence: None recorded; this does not mean none exists.

Substantive review

evidence/access-limits: approved · agent reviewer codex-research-checker · 2026-09-12

Full joint report section 2.1 explicitly limits access and the testing window. It does not identify the institution responsible for either constraint. Checked locator: Section 2.1, printed pages 1–2. Source version: 2024-11-19.