GPAI Ledger › Claude Mythos Preview (Anthropic) › Capture 29 Aug 2026
Claude Mythos Preview — capture 20260829T190158Z
| Provider | Anthropic |
|---|---|
| Target | AIAL evaluation (earlier state) — https://raw.githubusercontent.com/AIAccountabilityLab/gpai-training-transparency/948877cb12c420f0cc45ba011ba255f0570f985e/evals/claude-mythos-preview.yaml |
| Fetched (UTC) | 2026-08-29T19:01:58Z |
| Upstream commit | 6 Aug 2026 — 948877cb12c4 (when this state began to stand in the upstream repository; this archive fetched it at the time above, not then) |
| Stored file | 4,966 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 | 449ca659017331bb370077b3883a0c7f7b80c4d6ad26a19804b578b069b912ae |
| OpenTimestamps proof | 449ca659017331bb370077b3883a0c7f7b80c4d6ad26a19804b578b069b912ae.yaml.20260829T190158Z.ots (calendar-attested; anchored in bitcoin over time) |
| Wayback | not saved |
| Prior capture of this target | 162d8142b7a493042430d1da8a82030abcc1e8fd19512b8fb5140dd547d03624 (captured 2026-08-29T18:57:52Z) |
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 | 4,966 bytes |
|---|---|
| Canonical text SHA-256 | 83098568e203fd3a09c2a0129b823691df2ad72e90766cec98add301b4d4b710 |
| Extracted text length | 644 words |