Anthropic · proprietary on Arena · first on Arena 10 June 2026

claude-fable-5

142 days in first place

It held first place on Arena in WebDev (32 days) and Vision (110 days).

Embed

Who held first place

<iframe src="https://jesseahawkins.com/frontier/embed/" title="Frontier: who held first place on each Arena leaderboard, and for how long" width="100%" height="560" style="border:0;max-width:100%" loading="lazy"></iframe>

Credits LMArena.

The open-weights catch-up

<iframe src="https://jesseahawkins.com/frontier/embed/catch-up/" title="Frontier: the days until open weights matched each closed leader" width="100%" height="900" style="border:0;max-width:100%" loading="lazy"></iframe>

Credits LMArena.

The saturation clock

<iframe src="https://jesseahawkins.com/frontier/embed/clock/" title="Frontier: the days from each benchmark’s release to a model at 90%" width="100%" height="640" style="border:0;max-width:100%" loading="lazy"></iframe>

Credits Epoch AI.

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Cite

This page

Jesse Hawkins, “claude-fable-5 · Frontier”, jesseahawkins.com, data retrieved 30 Oct 2026. https://jesseahawkins.com/frontier/claude-fable-5/. Data: LMArena, Arena leaderboard dataset, revision 4491b06, CC BY 4.0; Epoch AI, Capabilities & benchmarking, CC BY 4.0.

BibTeX

@misc{hawkins2026frontierclaudefable5,
  author = {Hawkins, Jesse},
  title = {{claude-fable-5 · Frontier}},
  year = {2026},
  howpublished = {\url{https://jesseahawkins.com/frontier/claude-fable-5/}},
  note = {Data: LMArena, Arena leaderboard dataset, revision 4491b06, CC BY 4.0; Epoch AI, Capabilities \& benchmarking, CC BY 4.0, retrieved 2026-10-30}
}

Arena · LMArena

LMArena, "Arena leaderboard dataset", Hugging Face, revision 4491b06. https://huggingface.co/datasets/lmarena-ai/leaderboard-dataset. CC BY 4.0.

Benchmarks · Epoch AI

Epoch AI, 'Capabilities & benchmarking'. Published online at epoch.ai. Retrieved from 'https://epoch.ai/benchmarks' [online resource]. CC BY 4.0.

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Post on X

Text: best place 3

last on the board 13 September 2026

1st10th

On the board: 10 June 2026 to 13 September 2026
Score: 1493 (1488–1497) on 13 September 2026 · 30,057 votes

WebDev: 32 days in first place

last on the board 11 September 2026

1st10th

On the board: 10 June 2026 to 11 September 2026
Score: 1628 (1621–1635) on 11 September 2026 · 10,081 votes
First place: 10 June 2026 to 12 July 2026 · 32 days
Catch-up: Open weights matched it on 26 July 2026, 46 days after it first took first place: kimi-k3-max.

Vision: 110 days in first place

last on the board 13 September 2026

1st10th

On the board: 10 June 2026 to 13 September 2026
Score: 1326 (1318–1334) on 13 September 2026 · 11,304 votes
First place: 10 June 2026 to 28 September 2026 · 110 days
Catch-up: It left the board on 13 September 2026, 95 days after it first took first place. No open-weights model had matched it.

Epoch AI: Claude Fable 5

released 9 June 2026 · API access

Chess Puzzles 47.0%
EBR-bench 39.5%
FrontierMath-Tier-4-v2-Private 90.2%
FrontierMath-Tiers-1-3-v2-Private 87.0%
Furniture Assembly 35.8%
GPQA diamond 85.9%
MirrorCode 63.9%
Mystery Game Puzzles 52.0%
OTIS Mock AIME 2024-2025 100.0%
SimpleQA Verified 70.7%

When each vendor retires it

every model’s dates

Anthropic not before 9 Jun 2027 claude-fable-5
Azure AI Foundry 5 Dec 2027 claude-fable-5 (version 1)

Sources

Arena scores come from people voting between two anonymous answers. First place is the highest score; the top two are often within each other’s margin of error. LMArena, Arena leaderboard dataset, revision 4491b06, retrieved 30 October 2026; Epoch AI, Capabilities & benchmarking, retrieved 30 October 2026. Both CC BY 4.0. Retirement dates: each vendor’s own deprecation page, quoted and kept, listed with the record.