Model lifecycle
Claude Fable 5
Released 2026-06-09 · Back to Claude
Exact-version signals observed 2026-06-12–2026-07-13 · n=8,995
Lifecycle updated daily · latest complete UTC day 2026-07-13
- Fixed 14-day baseline
- 67.9 n=2,166
- Latest 28 days
- 53.0 n=7,401
- Change vs baseline
- −15.0
- 90-day slope
- – pts / 30 days
14-day rolling experience
Each daily point summarizes the previous 14 complete UTC days. The dashed line is the fixed release baseline; the verdict still uses independent non-overlapping 14-day segments.
2 of 4 independent 14-day segments ready for trend judgment.
What explains the change
Experience change and discussion-mix change are separated. These are observational contributions, not proof of cause.
Largest negative experience contributions: General text, Coding, Reasoning.
| Category | Baseline → current | Category change | Weight share | Experience contribution | Discussion-mix contribution |
|---|---|---|---|---|---|
| General text | 46.9 → 33.9n=873 → 3330 | −13.0 | 36.7% → 41.9% | −5.11 | −1.04 |
| Coding | 81.6 → 66.5n=285 → 1000 | −15.2 | 14.1% → 14.1% | −2.14 | −0.00 |
| Reasoning | 93.2 → 88.8n=689 → 1774 | −4.4 | 34.9% → 26.4% | −1.36 | −2.57 |
| Speed & latency | 62.1 → 49.0n=84 → 452 | −13.1 | 3.9% → 6.1% | −0.66 | −0.11 |
| Safety & refusals | 13.1 → 8.1n=133 → 613 | −5.0 | 5.9% → 8.6% | −0.36 | −1.31 |
| Roleplay / creative | 81.5 → 76.7n=93 → 208 | −4.9 | 4.1% → 2.7% | −0.17 | −0.27 |
| Image / vision | not enough datan=6 → 21 | – | – | – | – |
| Local deploy | not enough datan=3 → 3 | – | – | – | – |
Unresolved contribution from categories below the sample threshold: +0.10 pts.
Lifecycle scores use the same experience-signal weights as the main index, without sample shrinkage after n=30. They measure public user perception, not model capability or backend causes.