Next AI ModelTrack every AI release. Know what's coming next.

Claude Fable 5

Anthropic · Claude Fable line · flagship

Released June 9, 2026Replaced by Claude Fable 5.1

What changed

Anthropic's new top-end model: a big jump on hard coding tasks over Opus 4.8 — at twice the price.

Compared with Claude Opus 4.8 · the model it replaces

Solves 8 in 10 hard real-world coding tasks

SWE-bench Pro — fixing real bugs in real software projects

80.3%

▲ up from 69.2% · +11 points

Solves about 3 in 10 research-grade coding problems

FrontierCode Diamond — the hardest tier of coding evals

29.3%

▲ up from 13.4% · more than doubled

Costs developers twice as much to run

Price per 1M tokens — what developers pay, input / output

$10 / $50

price doubled — was $5 / $25

Sources: Anthropic · Anthropic Docs · Vellum

Where the Claude Fable line stands

Claude Fable 5.1 is the current model in this line. The card shows how long it has been since the last release against the line's usual gap and its recent ones — the rhythm, not a date.

Claude Fable 5.1

Anthropic · Claude Fable line · flagship
Just releasedreleased 8 days ago — usual gap is ~84

Anthropic's top model, refreshed: big jumps on long coding and scientific-research tasks, and cached input now costs 75% less — same headline price as Fable 5.

Released Sep 1, 2026 · what changed →
Days since last release
Claude Fable 5.1 · Sep 1, 2026
8
days
Usual gap
84
days
Recent gaps
Claude Fable 5.1 · Sep 2026
84

Every Claude Fable release

Newest first. See the full line with every card →

  1. Sep 1, 2026Claude Fable 5.1
  2. Jun 9, 2026Claude Fable 5 · this page

Get the weekly drop

One email a week: what AI models shipped, the actual differences vs the previous version, and what's coming next. No filler.