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Claude Opus 5 vs Claude Fable 5

Of the 3 public leaderboards that rate both, Claude Opus 5 scores higher on 2 and Claude Fable 5 on 1. On the ArtificialWatch Index, which takes the median of each model's percentile across the boards that score it, Claude Opus 5 is at 74.1 and Claude Fable 5 at 60.4 (out of 100). On each maker's API, Claude Opus 5 costs $5 / $25 per 1M tokens (input / output) and Claude Fable 5 $10 / $50.

Scores as published by each board; table composed November 7, 2026.

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Leaderboard by leaderboard

BoardClaude Opus 5Claude Fable 5Higher
LMArena
Elo (community votes)
1,691.31,625Claude Opus 5
SimpleBench
AVG@5 % (private set)
80.681.9Claude Fable 5
LLM Stats
LLM Stats Score · composite (0-100), their rendered top 15
53.452.8Claude Opus 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 Opus 5 is at 86.7 (#6 of 45) and Claude Fable 5 at 88.1 (#5). Claude Opus 5 scores higher on 1 of the 2 coding boards that rate both and Claude Fable 5 on 1.

Coding boardClaude Opus 5Claude Fable 5
LMArena · Coding1,532.71,518.7
Vals Vibe Code Bench88.490.4

The full AI coding leaderboard →

Claude Opus 5 at a glance

Developer
Anthropic
Status
Live since July 24, 2026
API price
$5 input / $25 output per 1M tokens · Anthropic, claude-opus-5
Context window
1M tokens

Live — detected 16:51 UTC Jul 24, alert fired 61s later · superseded by Opus 5.5 on Sep 22 and moved to Anthropic's legacy list; still served at $5/$25, which is now MORE than its successor.

Claude Opus 5 is live — we detected it at 16:51 UTC and had alerts out 61 seconds later

2026-07-24 · Anthropic's Claude Opus 5 went live on the public API today. Our checkers saw the id appear at 16:51:33 UTC, confirmed it on the next 60-second sweep, and the alert blast went out at 16:52:34 — sixty-one seconds from first sighting to inbox.

Full Claude Opus 5 tracker →

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 →

Claude Opus 5 vs Claude Fable 5: quick answers

Which is better, Claude Opus 5 or Claude Fable 5?

It depends on what you measure. Of the 3 public leaderboards that rate both, Claude Opus 5 scores higher on 2 and Claude Fable 5 on 1. Claude Opus 5's widest lead is on LMArena; 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 Opus 5 is at 74.1 and Claude Fable 5 at 60.4 (out of 100).

Which is newer, Claude Opus 5 or Claude Fable 5?

Claude Opus 5. It went live on July 24, 2026, 23 days after Claude Fable 5 (July 1, 2026).

Which is cheaper, Claude Opus 5 or Claude Fable 5?

Claude Opus 5 is cheaper on both input and output. On each vendor's own API, Claude Opus 5 is $5 input / $25 output per million tokens and Claude Fable 5 is $10 input / $50 output per million tokens. Prices as published in the models.dev catalog, as of 2026-11-07.

Which has the bigger context window, Claude Opus 5 or Claude Fable 5?

Neither. Both take 1M tokens.

How do Claude Opus 5 and Claude Fable 5 compare for coding?

On the ArtificialWatch coding index, Claude Opus 5 is at 86.7 (#6 of 45) and Claude Fable 5 at 88.1 (#5). Claude Opus 5 scores higher on 1 of the 2 coding boards that rate both and Claude Fable 5 on 1.

Who makes Claude Opus 5 and Claude Fable 5?

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 7, 2026). Boards measure different things, so raw scores are only comparable within a row.

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