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Claude Fable 5 vs Claude Opus 4.8
Claude Fable 5 scores higher than Claude Opus 4.8 on both public leaderboards that rate them. On the ArtificialWatch Index, which takes the median of each model's percentile across the boards that score it, Claude Fable 5 is at 60.4 and Claude Opus 4.8 at 30.4 (out of 100). On each maker's API, Claude Fable 5 costs $10 / $50 per 1M tokens (input / output) and Claude Opus 4.8 $5 / $25.
Scores as published by each board; table composed November 8, 2026.
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Leaderboard by leaderboard
| Board | Claude Fable 5 | Claude Opus 4.8 | Higher |
|---|---|---|---|
| LMArena Elo (community votes) | 1,625 | 1,555.9 | Claude Fable 5 |
| SimpleBench AVG@5 % (private set) | 81.9 | 64.8 | 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 88.1 (#5 of 45) and Claude Opus 4.8 at 52.3 (#18). Claude Fable 5 scores higher on both coding boards that rate them.
| Coding board | Claude Fable 5 | Claude Opus 4.8 |
|---|---|---|
| LMArena · Coding | 1,518.7 | 1,490.8 |
| Vals Vibe Code Bench | 90.4 | 82.7 |
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.
Claude Opus 4.8 at a glance
- Developer
- Anthropic
- Status
- Live since May 27, 2026
- API price
- $5 input / $25 output per 1M tokens · Anthropic, claude-opus-4-8
- Context window
- 1M tokens
Live.
Claude Fable 5 vs Claude Opus 4.8: quick answers
Which is better, Claude Fable 5 or Claude Opus 4.8?
It depends on what you measure. Claude Fable 5 scores higher than Claude Opus 4.8 on both public leaderboards that rate them. Claude Fable 5's widest lead is on SimpleBench. On the ArtificialWatch Index, which takes the median of each model's percentile across the boards that score it, Claude Fable 5 is at 60.4 and Claude Opus 4.8 at 30.4 (out of 100).
Which is newer, Claude Fable 5 or Claude Opus 4.8?
Claude Fable 5. It went live on July 1, 2026, 35 days after Claude Opus 4.8 (May 27, 2026).
Which is cheaper, Claude Fable 5 or Claude Opus 4.8?
Claude Opus 4.8 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 Claude Opus 4.8 is $5 input / $25 output per million tokens. Prices as published in the models.dev catalog, as of 2026-11-08.
Which has the bigger context window, Claude Fable 5 or Claude Opus 4.8?
Neither. Both take 1M tokens.
How do Claude Fable 5 and Claude Opus 4.8 compare for coding?
On the ArtificialWatch coding index, Claude Fable 5 is at 88.1 (#5 of 45) and Claude Opus 4.8 at 52.3 (#18). Claude Fable 5 scores higher on both coding boards that rate them.
Who makes Claude Fable 5 and Claude Opus 4.8?
Both are from Anthropic.
Where do these numbers come from?
Each score is the leaderboard's own published figure, read by ArtificialWatch (table composed November 8, 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