Anthropic

Claude Fable 5

Announced Jun 9, 2026

A new tier for demanding work

What could it do?

Anthropic introduced Fable for ambitious coding and professional projects.

What changed?

Introduced its fifth model generation.

WHY IT MATTERED

Targeted complex tasks spanning long sessions.

Where it fell short

Access was interrupted June 12 and restored July 1; announcement is not continuous availability.

Sources checked Oct 7, 2026

Release facts were checked against the sources below. Performance claims belong to the developers; we have not independently tested these models.

Developer announcement or release log

Benchmark results

EPOCH AI CAPABILITY ESTIMATE

162.1index points

Tested variant: Claude Fable 5Source interval: 159.3 to 166.2Variant date in source: Jun 9, 2026

A benchmark estimate, not a percentage or capability multiplier. Reasoning settings are not specified in this source table. Historical estimates can change in later snapshots.

Epoch AI methodology ↗Download the source snapshotChecked Oct 7, 2026 · CC BY 4.0

PUBLISHED BENCHMARK RESULT

1504rating points

Tested: claude-fable-5-highText Arena Overall · October 8, 2026Reported interval: 1500 to 150840,026 votes

One explicitly named variant per release. Scores come from the same Overall snapshot; preliminary entries and reported intervals are preserved. These are current ratings of earlier variants, not their launch day ratings.

Source: Text Arena ↗Download selected resultsChecked Oct 8, 2026

Understand the benchmarks Find this release on the chart

Access history

Jun 12, 2026: Fable and Mythos access paused

Jul 1, 2026: Fable and Mythos access restored