anthropic/claude-fable-5.1 · Model identity and integrity report
Last updated：Sep 2, 2026, 5:26 PM · Data window: past 90 days
Measured results (90 days)
7 runs · 4 hosts · 5 anomalies
Family-fingerprint consistency
anthropic 6 ██████████████████████░░░ 86% (expected) unknown 1 ████░░░░░░░░░░░░░░░░░░░░░ 14% (suspicious)
Observed V3 sub-model mapping
→ abstain 5 (71%) — low confidence → unknown 2 (29%) ⚠ mismatch
Capability score distribution (auxiliary)
0-49 ███████░░░░░░░░░░░░░░░░░░ 2 50-69 ███████░░░░░░░░░░░░░░░░░░ 2 70-89 ███████████░░░░░░░░░░░░░░ 3 90-100 ░░░░░░░░░░░░░░░░░░░░░░░░░ 0
Host integrity ranking
| Host | Runs | Average score | Family match | Most common V3 match |
|---|---|---|---|---|
| https://api.a6api.com/v1 | 3 | 53 | 67% | — |
| https://yuzapi.fun/v1 | 2 | 34 | 100% | — |
| https://www.poke2api.com/v1 | 1 | 64 | 100% | — |
| https://cheapai.lol/v1 | 1 | 74 | 100% | — |
Recent anomalies
https://api.a6api.com/v1Sep 2, 2026, 12:44 PM
- Self-claimed model
- claude-fable-5.1
- V2 predicted family
- anthropic
- V3 best match
- —
- Verdict
- V3 low confidence · Abstain
https://api.a6api.com/v1Sep 2, 2026, 12:39 PM
- Self-claimed model
- claude-fable-5.1
- V2 predicted family
- anthropic
- V3 best match
- —
- Verdict
- V3 low confidence · Abstain
https://www.poke2api.com/v1Sep 2, 2026, 10:07 AM
- Self-claimed model
- claude-fable-5-1
- V2 predicted family
- anthropic
- V3 best match
- —
- Verdict
- V3 low confidence · Abstain
https://yuzapi.fun/v1Sep 2, 2026, 6:43 AM
- Self-claimed model
- claude-fable-5-1
- V2 predicted family
- anthropic
- V3 best match
- —
- Verdict
- V3 low confidence · Abstain
https://cheapai.lol/v1Sep 2, 2026, 2:54 AM
- Self-claimed model
- claude-fable-5.1
- V2 predicted family
- anthropic
- V3 best match
- —
- Verdict
- V3 low confidence · Abstain
Methodology
BazaarLink Probe combines a Bayesian V2 family classifier across nine fingerprint categories with V3 sub-model references to verify endpoints claiming anthropic/claude-fable-5.1. Low family consistency, a different V3 match, or divergence from selfClaim is flagged as anomalous. BazaarLink Probe home.