GPAI Ledger › Claude Opus 4.1 (Anthropic) › Capture 29 Aug 2026
Claude Opus 4.1 — capture 20260829T142305Z
| Provider | Anthropic |
|---|---|
| Target | AIAL evaluation — https://raw.githubusercontent.com/AIAccountabilityLab/gpai-training-transparency/main/evals/claude-opus-4-1.yaml |
| Fetched (UTC) | 2026-08-29T14:23:05Z |
| Stored file | 3,797 bytes — not served (third-party research, archived but not republished here); the hash, timestamp proof and Wayback witness below still establish what was published when |
| SHA-256 | 8423812d268e84b085a7c9aae56b6c865f61625c27490e1ff508a770a1a3bc6a |
| OpenTimestamps proof | 8423812d268e84b085a7c9aae56b6c865f61625c27490e1ff508a770a1a3bc6a.txt.20260829T142305Z.ots (calendar-attested; anchored in bitcoin over time) |
| Wayback | Wayback snapshot, 2026-08-29 14:37 UTC |
| Prior capture of this target | — first capture of this target |
Verify: obtain the file from the target address above, or from the Wayback snapshot below, then sha256sum it — it must equal the hash above; the .ots proof dates that hash.
Structured facts
This is another organisation's own research, and this project does not redistribute it: the file itself is not served here; these facts still pin its identity and let any copy be authenticated against this record.
| Document size | 3,797 bytes |
|---|---|
| Canonical text SHA-256 | 2ca41f9f6574364072902f4291a6c56eb7c461d961bc22817994960228de940b |
| Extracted text length | 435 words |