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Claude Fable 5 vs GPT-5.5
Claude Fable 5 scores higher than GPT-5.5 on all 3 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 69.9 and GPT-5.5 at 66.7 (out of 100). On each maker's API, Claude Fable 5 costs $10 / $50 per 1M tokens (input / output) and GPT-5.5 $5 / $30.
Scores as published by each board; table composed November 10, 2026.
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Leaderboard by leaderboard
| Board | Claude Fable 5 | GPT-5.5 | Higher |
|---|---|---|---|
| LMArena Elo (community votes) | 1,625.2 | 1,511.9 | Claude Fable 5 |
| SimpleBench AVG@5 % (private set) | 81.9 | 76.9 | Claude Fable 5 |
| Epoch AI Epoch Capabilities Index (ECI) · many benchmarks on one scale | 164.3 | 162.8 | Claude Fable 5 |
Raw scores are each board's own scale, so compare within a row, not across rows. Full table: the bench index.
For coding
On the ArtificialWatch coding index, Claude Fable 5 is at 88.8 (#4 of 47) and GPT-5.5 at 38.4 (#29). Claude Fable 5 scores higher on both coding boards that rate them.
| Coding board | Claude Fable 5 | GPT-5.5 |
|---|---|---|
| LMArena · Coding | 1,518.6 | 1,493.9 |
| Vals Vibe Code Bench | 90.4 | 69.8 |
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.
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.
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 3 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 69.9 and GPT-5.5 at 66.7 (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 2026-11-10.
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.
How do Claude Fable 5 and GPT-5.5 compare for coding?
On the ArtificialWatch coding index, Claude Fable 5 is at 88.8 (#4 of 47) and GPT-5.5 at 38.4 (#29). Claude Fable 5 scores higher on both coding boards that rate them.
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 November 10, 2026). Boards measure different things, so raw scores are only comparable within a row.
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Also: the bench index · API pricing · what a workload costs on each · the wire