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Claude Fable 5 vs GPT-5.5

Claude Fable 5 scores higher than GPT-5.5 on all 5 public leaderboards that rate both. On the ArtificialWatch Index, which takes the median of each model's percentile across the boards that score it, Claude Fable 5 is at 85.1 and GPT-5.5 at 44.8 (out of 100).

Scores as published by each board; table composed September 25, 2026.

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Leaderboard by leaderboard

BoardClaude Fable 5GPT-5.5Higher
LMArena
Elo (community votes)
1,626.81,510.1Claude Fable 5
LiveBench
global average (0-100)
8380.2Claude Fable 5
SimpleBench
AVG@5 % (private set)
81.976.9Claude Fable 5
Vals AI
Vals Index accuracy % · weighted finance + coding tasks
6657.4Claude Fable 5
Artificial Analysis
intelligence index · measured runs only
49.638.4Claude Fable 5

Raw scores are each board's own scale, so compare within a row, not across rows. Full table: the bench index.

Claude Fable 5 at a glance

Developer
Anthropic
Status
Live since July 1, 2026
API price
$10 input / $50 output per 1M tokens · Anthropic, claude-fable-5
Context window
1M tokens

Returned Jul 1.

Full Claude Fable 5 tracker →

GPT-5.5 at a glance

Developer
OpenAI
Status
Live since April 24, 2026
API price
$5 input / $30 output per 1M tokens · OpenAI, gpt-5.5
Context window
1.05M tokens

Live.

Full GPT-5.5 tracker →

Claude Fable 5 vs GPT-5.5: quick answers

Which is better, Claude Fable 5 or GPT-5.5?

It depends on what you measure. Claude Fable 5 scores higher than GPT-5.5 on all 5 public leaderboards that rate both. Claude Fable 5's widest lead is on LMArena. On the ArtificialWatch Index, which takes the median of each model's percentile across the boards that score it, Claude Fable 5 is at 85.1 and GPT-5.5 at 44.8 (out of 100).

Which is newer, Claude Fable 5 or GPT-5.5?

Claude Fable 5. It went live on July 1, 2026, 68 days after GPT-5.5 (April 24, 2026).

Which is cheaper, Claude Fable 5 or GPT-5.5?

GPT-5.5 is cheaper on both input and output. On each vendor's own API, Claude Fable 5 is $10 input / $50 output per million tokens and GPT-5.5 is $5 input / $30 output per million tokens. GPT-5.5's rate rises for prompts over 272K tokens. Prices as published in the models.dev catalog, as of 2026-09-25.

Which has the bigger context window, Claude Fable 5 or GPT-5.5?

GPT-5.5, at 1.05M tokens against Claude Fable 5's 1M, as each vendor lists it.

Who makes Claude Fable 5 and GPT-5.5?

Claude Fable 5 is from Anthropic; GPT-5.5 is from OpenAI.

Where do these numbers come from?

Each score is the leaderboard's own published figure, read by ArtificialWatch (table composed September 25, 2026). Boards measure different things, so raw scores are only comparable within a row.

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