10a Labs
What it was engaged to test, on what terms, what it found in the document's own words, and what happened afterwards. Every line is a record; every record links to the document it was read from.
- FoundedSeptember 2022
- HQWashington, DC
- Registry idnone cited (company)
- TestsRed teaming of safeguards and classifiers (manual and automated), model evaluations, risk classification and threat intelligence on AI misuse; named in Anthropic's Fable 5 and Mythos 5, Opus 5, Fable 5.1 and Opus 5.5 cards (up to 6,700 prompts, 56 hours across 82 conversations); no other lab document read names it.
- Money, as the roster puts itBootstrapped by its own account; no investor, customer or revenue figure named; Washington, DC, founded September 2022.
- Filesdossier · observatory, sliced to it · graph
- Labs tested
- Anthropic
- Span of engagements
- 9 June 2026 – 22 September 2026
- Terms and findings
- 4 of 4 documents state a term · 4 quote a finding
- Money in, US dollars, stated single-recipient rows
- no stated figure 0 in · 0 out
- Seats, by side
- no seat names it
- Afterwards
- no later event on record
Each count is the number of store records that name this evaluator. An engagement is one lab document naming it for one model; an outcome is an event on the record afterwards; the money, seats and moves are the observatory's rows filtered to it. A cell that cannot be filled says not stated, and each table ends with how many of its rows state each field.
Filters combine: any of the values ticked within a dimension, all of the dimensions at once. A table that has no column for a dimension you have set says so instead of showing rows that cannot match. The address bar carries the slice.
What it was engaged to test 4 engagements, Anthropic
In date order, each from the lab document that names the evaluator. Under each: the four terms that document states (access, model stage, publication, payment) and the finding in its words. A term the document is silent on reads not stated; the tags beside the terms are read off their words and are what the console filters on.
- Document: Claude Fable 5 and Mythos 5 system card
- Access window"10a Labs spent about 20 hours red-teaming the classifiers on a ransomware-creation task using a variety of established jailbreaking techniques"
- Model stagenot stated
- Publicationnot stated
- Paymentnot stated
Finding, in the document's words"These attempts were unsuccessful. 10a Labs found that the classifiers detected not just risky keywords, but the broader operational pattern once enough pieces appeared together"
- Document: Claude Opus 5 system card
- Access window"10a Labs spent around 16 hours testing a variety of attack techniques"
- Model stagenot stated
- Publicationnot stated
- Paymentnot stated
Finding, in the document's words"did not find a jailbreak that accomplished the tasks provided"
Sources: Claude Opus 5 system card b2f1dfdeff - Access window"10a Labs ran over 6,700 automated and manual prompts against Fable 5.1"
- Model stagenot stated
- Publicationnot stated
- Paymentnot stated
Finding, in the document's words"They reported that 'refusal behavior was consistently restrictive in cyber tasks' and could not produce outputs that could be weaponized"
- Document: Claude Opus 5.5 system card
- Access window"10a Labs spent roughly 56 hours red teaming Claude Opus 5.5 across 82 multi-turn attack conversations"
- Model stagenot stated
- Publicationnot stated
- Paymentnot stated
Finding, in the document's words"No conversation advanced past proof of concept, and every directly offensive request was blocked"
Sources: Claude Opus 5.5 system card 9713b36cdb
Dated 4 of 4Model named 4 of 4Terms stated 4 of 4Finding quoted 4 of 4
The terms, as the documents state them
The same engagements as a grid, one row per document and model, so the silences line up: a document that gives an access window but no payment term, or a finding but no publication term, reads that way here.
| Document | Model | Access window | Model stage | Publication | Payment | Finding | Record |
|---|---|---|---|---|---|---|---|
| Claude Fable 5 and Mythos 5 system cardAnthropic · 9 June 2026 | Fable 5 | "10a Labs spent about 20 hours red-teaming the classifiers on a ransomware-creation task using a variety of established jailbreaking techniques" | not stated | not stated | not stated | quoted | 5bb0c7b128 |
| Claude Opus 5 system cardAnthropic · 24 July 2026 | Opus 5 | "10a Labs spent around 16 hours testing a variety of attack techniques" | not stated | not stated | not stated | quoted | b2f1dfdeff |
| Claude Fable 5.1 and Mythos 5.1 system cardAnthropic · 1 September 2026 | Fable 5.1 | "10a Labs ran over 6,700 automated and manual prompts against Fable 5.1" | not stated | not stated | not stated | quoted | 32948233ad |
| Claude Opus 5.5 system cardAnthropic · 22 September 2026 | Opus 5.5 | "10a Labs spent roughly 56 hours red teaming Claude Opus 5.5 across 82 multi-turn attack conversations" | not stated | not stated | not stated | quoted | 9713b36cdb |
Access window 4 of 4Model stage 0 of 4Publication 0 of 4Payment 0 of 4Finding, quoted 4 of 4
What happened afterwards 0 on record
Events a party published after an engagement: an incident on a model this evaluator's engagement covered, a correction or added disclosure, a later finding that cut against an earlier one, a lab's statement that it acted or did not act on the finding, or a move from this evaluator to a lab it graded. A row the source attaches to this evaluator by name is marked named; one that reaches it through the model it tested is marked via the model. The kind is what the record states, not why.
| Kind | Developer | Model | What the record states | When | Source | Id |
|---|---|---|---|---|---|---|
| no later event on record | ||||||
Dated 0 of 0Model named 0 of 0Tied to an engagement 0 of 0Evaluator named by the record 0 of 0
The money on record 0 rows
Rows of the observatory's money table that name this evaluator as recipient (in) or as funder (out), each as the record states it: a grant table line, a contract notice, a Form 990 schedule or the party's own disclosure. A figure quoted in prose is marked and never summed.
| Direction | Funder | Recipient | Amount, as recorded | When | Record | Source | Id |
|---|---|---|---|---|---|---|---|
| no money row names this evaluator | |||||||
Amount stated 0 of 0Dated 0 of 0Purpose stated 0 of 0Funder profiled 0 of 0Recipient on the roster 0 of 0
Seats and moves 0 seats · 0 moves
Seats read off a team page, a governance page, an appointment notice or a filing that name this organization, and the dated moves into or out of it, from the observatory's own tables.
| Person | Side | Seat, as the record states it | Role | Dates | Source | Id |
|---|---|---|---|---|---|---|
| no seat on record names this evaluator | ||||||
Role read 0 of 0Organization read 0 of 0Organization profiled 0 of 0Dated 0 of 0
Moves
| Person | From | To | When | Source | Id | |
|---|---|---|---|---|---|---|
| no move on record names this evaluator | ||||||
From profiled 0 of 0To profiled 0 of 0Person profiled 0 of 0Dated 0 of 0