GPAI Ledger › Claude Opus 4.8 (Anthropic) › Capture 29 Aug 2026
Claude Opus 4.8 — capture 20260829T190638Z
| Provider | Anthropic |
|---|---|
| Target | AIAL evaluation (earlier state) — https://raw.githubusercontent.com/AIAccountabilityLab/gpai-training-transparency/a3575567d55d0b1e4744c902cf7806232eaef55d/evals/claude-opus-4-8.yaml |
| Fetched (UTC) | 2026-08-29T19:06:38Z |
| Upstream commit | 6 Aug 2026 — a3575567d55d (when this state began to stand in the upstream repository; this archive fetched it at the time above, not then) |
| Stored file | 4,962 bytes — not served (third-party research, archived but not republished here); the hash and timestamp proof below still establish what was published when |
| SHA-256 | eaf90fd74c3c4ca26ec03baeb4924f80f3084e5c46580509e7fdc7e023d8ad1c |
| OpenTimestamps proof | eaf90fd74c3c4ca26ec03baeb4924f80f3084e5c46580509e7fdc7e023d8ad1c.yaml.20260829T190638Z.ots (calendar-attested; anchored in bitcoin over time; identical bytes were first archived on 29 Aug 2026 — that version carries the earliest attestation) |
| Wayback | not saved |
| Prior capture of this target | dcdedf4200e0bf0b434b095646e165b136ee1b01c04f2ed8d99728036a70e6a8 (captured 2026-08-29T19:02:14Z) |
Verify: obtain the file from the target address above, 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 | 4,962 bytes |
|---|---|
| Canonical text SHA-256 | 1efeaef24f8bb16905320d0da184a63479e43b07f6186e840229f4b92d864d1d |
| Extracted text length | 644 words |