GPAI Ledger › Claude Opus 4.8 (Anthropic) › Capture 29 Aug 2026
Claude Opus 4.8 — capture 20260829T184926Z
| Provider | Anthropic |
|---|---|
| Target | AIAL evaluation (earlier state) — https://raw.githubusercontent.com/AIAccountabilityLab/gpai-training-transparency/38dfbd8da731954fe4eef2364736805a3eef99be/evals/claude-opus-4-8.yaml |
| Fetched (UTC) | 2026-08-29T18:49:26Z |
| Upstream commit | 3 Aug 2026 — 38dfbd8da731 (when this state began to stand in the upstream repository; this archive fetched it at the time above, not then) |
| Stored file | 4,077 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 | bf55e291a75bc6e5c5281c9e52362911843732d366c27c281ca0e98a21cbf50d |
| OpenTimestamps proof | bf55e291a75bc6e5c5281c9e52362911843732d366c27c281ca0e98a21cbf50d.yaml.20260829T184926Z.ots (calendar-attested; anchored in bitcoin over time) |
| Wayback | not saved |
| Prior capture of this target | 852f3152cdb64cb7aa6d9d47f3cf81f4aa3abdbb5de6aa57a7d36274b3b296ef (captured 2026-08-29T18:48:41Z) |
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 | 4,077 bytes |
|---|---|
| Canonical text SHA-256 | 23551d5888867ef4288fcb393d5b7599c4e1867a054c6ed25df8937cd83a6b18 |
| Extracted text length | 531 words |