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#58

Claude Fable 5

Anthropic Release: 2026-06-10 Tested on: 2026-10-01 01:39 anthropic/claude-fable-5::medium
~9.5T total (~878B active)MoEClosedEstimated

Summary

Claude Fable 5 scores 8.9 on AI BENCHY and ranks #58. It has 10.0 reliability, a 79.7% pass rate, $5.089 total cost, and 16.84s average response time.

Model facts

Researched on 2026-08-12

Estimated
Parameters
~9.5T total (~878B active)
Architecture
MoE
Availability
Closed
License
-

Best estimate from public evidence; the vendor did not disclose every value. Unverified architecture reconstruction. Anthropic does not disclose parameter counts.

Parameter source Availability source

Score

8.9

Consistency

9.6

Reliability

10.0

Total Cost (Current Price)

$5.089

Total Output Tokens

47,285

Total Input Tokens

272,411

Input Price

$10.000 / 1M

Output Price

$50.000 / 1M

Cache Read Price

$1.000 / 1M

Cache Write Price

$12.500 / 1M

Cache prices apply to input tokens. Reads reuse cached prompts; writes store them and can cost extra. Output tokens use the output price.

Tests Correct

Wrong Tests: 5

Attempt pass rate: 79.7%

Flaky tests

1

Flaky tests had mixed outcomes across runs (at least one pass and one fail).

Response Time (avg)

16.84s

Response Time (max): 80.80s

Response Time (total): 387.26s

No answer: 3 Invalid tool call: 1 Wrong answer: 1

Hamster playing table tennis

Prompt: Create a detailed SVG illustration of a hamster playing table tennis.

#58 Claude Fable 5

medium
Cost
$0.606
Time
156.7s
Tokens
12,264 tok

Run history

Tested on Score Reliability Tests Correct Total Cost Compare
2026-10-01 01:39 Re-test 8.9 10.0 $5.089 Current run
2026-07-16 22:30 New test added 8.6 10.0 $3.478 Compare
2026-06-10 13:28 Initial run 8.7 10.0 $3.165 Compare

This run used a different benchmark suite. Keep suite changes in mind when reading historical movement.

Run comparison

RunBenchmark coverageScoreConsistencyReliabilityTests CorrectFlaky testsTotal Output TokensTotal Input TokensTotal CostResponse Time (avg)
2026-10-01 01:39 · Current run69/69 attempts8.99.610.018/23147,285272,411$5.08916.84s
2026-07-16 22:30 · New test added66/66 attempts8.69.610.017/22151,62989,643$3.47817.20s
Difference—+0.20.00.0+10-4344+182768+$1.611-363ms

Benchmark coverage differs: 69/69 attempts (Target: 3 repeats per test) versus 66/66 attempts (Target: 3 repeats per test). Totals and repeat-sensitive metrics are not directly comparable.

These two runs used different benchmark suites, so the deltas reflect both model changes and suite changes.

Price History

Historical pricing data for this model from OpenRouter.

Date Input Price Output Price Cache Read Price Cache Write Price
2026-08-14 12:51 $10.000 / 1M $50.000 / 1M N/A N/A
2026-10-01 18:33 $10.000 / 1M $50.000 / 1M $1.000 / 1M $12.500 / 1M

Charts

Choose the first model, then click a second model to open a side-by-side page.

Total Output Tokens

Score vs Total Output Tokens

Quick Compare

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Category Breakdown

Category Score Consistency Tests Correct
Agentic 10.0 10.0
Anti-AI Tricks 10.0 10.0
Coding 10.0 10.0
Combined 6.5 10.0
Data parsing and extraction 10.0 10.0
Domain specific 5.3 7.2
General Intelligence 10.0 10.0
Instructions following 10.0 10.0
Puzzle Solving 7.7 10.0
Tool Calling 10.0 10.0
Trivia 3.0 10.0

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