Model comparison

Claude Fable 5 vs GPT-5.5

A transparent comparison using blind RouterPlex votes, cited external data, live API pricing and observed evaluation latency.

Metric
Claude Fable 5
GPT-5.5
Combined quality
100.0
96.0
Arena score
Insufficient data
Insufficient data
External score
100.0
96.0
Median latency
Insufficient data
Insufficient data
Input / 1M
$10
$5
Output / 1M
$50
$30
Context
1M
256K

Head-to-head preference.

No direct RouterPlex Arena votes are published for this pair yet. The current quality comparison relies on the cited external snapshot below.

Which should you use?

Claude Fable 5 currently leads the combined quality signal. That does not settle every workload: compare the category result, token price and observed latency before choosing.

Evidence and freshness.

External scores preserve the original rating, rank, vote count and confidence interval. RouterPlex converts the source rank to a within-category percentile for the 0–100 display scale.

LMArena Text Leaderboard2026-07-21 text_style_control · retrieved 2026-07-22

Bradley-Terry ratings from LMArena's style-controlled text leaderboard. RouterPlex preserves the raw rating, source rank, confidence interval, vote count, and publish date. The displayed external score is the source-rank percentile within each source category.

LMArena leaderboard dataset, licensed CC BY 4.0. RouterPlex includes only exact case-insensitive model-ID matches. LMArena is not affiliated with RouterPlex.

Put both models on your prompt.

RouterPlex runs the same prompt through both models and reveals their names after your vote.

Compare in Arena
Claude Fable 5 vs GPT-5.5: Benchmark · RouterPlex