What's new

Anthropic

Claude Fable 5

AA reported #1 Intelligence Index on 2026-06-10, score 64.9; HLE 53%; GDPval-AA Elo 1932; Opus 4.8 fallback observed in some tasks.

84 Floor score

confidence: medium

84 Floor Capability

Finished benchmark shape.

58 Operating Envelope

Fable 5 DSWE is pending, so the operating score is capped until cost, time, and token rows exist.

92 Frontier Reality

AA Index 64.9 (#1)

82 Research Trust

Strong external capability signal, but fallback routing keeps the research-trust score provisional.

Current signal

AA Index 64.9 (#1)

Evidence completeness

74%

6 score dimensions represented.

DSWE

Not reported

Keep watch for a DeepSWE row.

Calculation

Score components

82 Accuracy + grounding

Correct, grounded answers on ordinary verifiable tasks.

82 Instruction discipline

Follows exact user constraints and output formats.

86 Honesty + reliability

Avoids unsupported confidence and remains stable across runs.

88 Reasoning floor

Handles non-flashy reasoning without brittle failures.

86 Agent/coding

Completes tool, coding, and agent-style tasks when evidence exists.

72 Operating envelope

Cost, speed, token burn, verbosity, and friction.

Caveat

What to watch

Current external frontier leader, but the public AA row includes Opus 4.8 fallback routing. Treat as provisional until internal prompt runs separate Fable from fallback.

Meaning

How to read the score

Each score is a 0-100 saturation scale. A score of 100 means that benchmark lane is complete for this model. Floor Capability is the finished benchmark shape; Operating Envelope, Frontier Reality, and Research Trust are provisional tabs that need prompt-pack backfill. Confidence is evidence quality, not another model grade. Evidence % is source coverage, not capability.

Citations

Benchmark sources

Artificial Analysis Intelligence IndexAA-OmniscienceHumanity's Last ExamGDPval-AATerminal-Bench Hard