Anthropic · proprietary on Arena · first on Arena 6 February 2026

claude-opus-4-6

72 days in first place

It held first place on Arena in Text (27 days), WebDev (35 days) and Vision (10 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.

Each frame links back to its page. Preview it.

Cite

This page

Jesse Hawkins, “claude-opus-4-6 · Frontier”, jesseahawkins.com, data retrieved 30 Oct 2026. https://jesseahawkins.com/frontier/claude-opus-4-6/. Data: LMArena, Arena leaderboard dataset, revision 4491b06, CC BY 4.0; Epoch AI, Capabilities & benchmarking, CC BY 4.0.

BibTeX

@misc{hawkins2026frontierclaudeopus46,
  author = {Hawkins, Jesse},
  title = {{claude-opus-4-6 · Frontier}},
  year = {2026},
  howpublished = {\url{https://jesseahawkins.com/frontier/claude-opus-4-6/}},
  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.

Download

Post on X

Text: 27 days in first place

place 10 of 419 on 28 October 2026

1st10th

On the board: 6 February 2026 to 28 October 2026, the newest snapshot
Score: 1496 (1493–1499) on 28 October 2026 · 89,324 votes
First place: 19 February 2026 to 18 March 2026 · 27 days
Catch-up: No open-weights model has matched it in the 251 days since it first took first place.

WebDev: 35 days in first place

place 52 of 152 on 28 October 2026

1st10th

On the board: 6 February 2026 to 28 October 2026, the newest snapshot
Score: 1537 (1532–1542) on 28 October 2026 · 20,576 votes
First place: 6 February 2026 to 9 February 2026 · 3 days
17 February 2026 to 4 March 2026 · 15 days
16 March 2026 to 2 April 2026 · 17 days
Catch-up: Open weights matched it on 16 June 2026, 130 days after it first took first place: glm-5.2 (max).

Vision: 10 days in first place

place 11 of 167 on 19 October 2026

1st10th

On the board: 26 March 2026 to 19 October 2026, the newest snapshot
Score: 1312 (1306–1319) on 19 October 2026 · 26,841 votes
First place: 31 March 2026 to 10 April 2026 · 10 days
Catch-up: No open-weights model has matched it in the 202 days since it first took first place.

Epoch AI: Claude Opus 4.6

released 5 February 2026 · API access

Chess Puzzles 21.0%
EBR-bench 12.7%
FrontierMath-2025-02-28-Private 40.7%
FrontierMath-Tier-4-2025-07-01-Private 22.9%
FrontierMath-Tier-4-v2-Private 26.8%
FrontierMath-Tiers-1-3-v2-Private 66.0%
Furniture Assembly 28.3%
GPQA diamond 90.5%
Mystery Game Puzzles 25.0%
OTIS Mock AIME 2024-2025 94.4%
SWE-Bench verified 78.7%
SimpleQA Verified 47.0%

When each vendor retires it

every model’s dates

Anthropic not before 5 Feb 2027 claude-opus-4-6
Azure AI Foundry 2 Feb 2027 claude-opus-4-6 (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.