Anthropic / arena-v1

Claude Opus 4.8 benchmark.

Blind preference, cited external scores, and evaluation economics. Every result keeps its sample count and source date attached.

Evidence levellow

Last update2026-08-07

Categories5

Combined quality

91.5

Arena score

51.2

Median latency

11889ms

Valid votes

1

Task analysis

Performance by task.

Category	Quality	Arena	External	Evidence
coding	97.3	Pending	97.3	Cited snapshot
general	96.6	Pending	96.6	Cited snapshot
overall	91.5	51.2	94.5	low / 1 votes
reasoning	91.9	Pending	91.9	Cited snapshot
writing	92.4	51.2	95.5	low / 1 votes

Provenance

External evidence.

LMArena Text Leaderboard

2026-08-03 text_style_control 0fdff69b4fd7

overallRank #221474.6 raw94.5 percentile

Bradley-Terry ratings from LMArena's style-controlled text leaderboard. RouterPlex preserves the raw rating, source rank, confidence interval, vote count, and publish date. The displayed external score is the source-rank percentile within each source category.

Published 2026-08-03 / 35,877 source votes / retrieved 2026-08-07 / LMArena leaderboard dataset, licensed CC BY 4.0. RouterPlex includes only exact case-insensitive model-ID matches. Official leaderboard: https://arena.ai/leaderboard. Dataset: https://huggingface.co/datasets/lmarena-ai/leaderboard-dataset. Dataset commit: 4e52c8e709c90a4cad8498d9db5aad11709b04e0. LMArena is not affiliated with RouterPlex.

LMArena Text Leaderboard

2026-08-03 text_style_control 0fdff69b4fd7

codingRank #111527.7 raw97.3 percentile

Bradley-Terry ratings from LMArena's style-controlled text leaderboard. RouterPlex preserves the raw rating, source rank, confidence interval, vote count, and publish date. The displayed external score is the source-rank percentile within each source category.

Published 2026-08-03 / 10,070 source votes / retrieved 2026-08-07 / LMArena leaderboard dataset, licensed CC BY 4.0. RouterPlex includes only exact case-insensitive model-ID matches. Official leaderboard: https://arena.ai/leaderboard. Dataset: https://huggingface.co/datasets/lmarena-ai/leaderboard-dataset. Dataset commit: 4e52c8e709c90a4cad8498d9db5aad11709b04e0. LMArena is not affiliated with RouterPlex.

LMArena Text Leaderboard

2026-08-03 text_style_control 0fdff69b4fd7

reasoningRank #311472.5 raw91.9 percentile

Bradley-Terry ratings from LMArena's style-controlled text leaderboard. RouterPlex preserves the raw rating, source rank, confidence interval, vote count, and publish date. The displayed external score is the source-rank percentile within each source category.

Published 2026-08-03 / 1,722 source votes / retrieved 2026-08-07 / LMArena leaderboard dataset, licensed CC BY 4.0. RouterPlex includes only exact case-insensitive model-ID matches. Official leaderboard: https://arena.ai/leaderboard. Dataset: https://huggingface.co/datasets/lmarena-ai/leaderboard-dataset. Dataset commit: 4e52c8e709c90a4cad8498d9db5aad11709b04e0. LMArena is not affiliated with RouterPlex.

LMArena Text Leaderboard

2026-08-03 text_style_control 0fdff69b4fd7

writingRank #181462.1 raw95.5 percentile

Bradley-Terry ratings from LMArena's style-controlled text leaderboard. RouterPlex preserves the raw rating, source rank, confidence interval, vote count, and publish date. The displayed external score is the source-rank percentile within each source category.

Published 2026-08-03 / 6,407 source votes / retrieved 2026-08-07 / LMArena leaderboard dataset, licensed CC BY 4.0. RouterPlex includes only exact case-insensitive model-ID matches. Official leaderboard: https://arena.ai/leaderboard. Dataset: https://huggingface.co/datasets/lmarena-ai/leaderboard-dataset. Dataset commit: 4e52c8e709c90a4cad8498d9db5aad11709b04e0. LMArena is not affiliated with RouterPlex.

LMArena Text Leaderboard

2026-08-03 text_style_control 0fdff69b4fd7

generalRank #141477.3 raw96.6 percentile

Bradley-Terry ratings from LMArena's style-controlled text leaderboard. RouterPlex preserves the raw rating, source rank, confidence interval, vote count, and publish date. The displayed external score is the source-rank percentile within each source category.

Published 2026-08-03 / 12,246 source votes / retrieved 2026-08-07 / LMArena leaderboard dataset, licensed CC BY 4.0. RouterPlex includes only exact case-insensitive model-ID matches. Official leaderboard: https://arena.ai/leaderboard. Dataset: https://huggingface.co/datasets/lmarena-ai/leaderboard-dataset. Dataset commit: 4e52c8e709c90a4cad8498d9db5aad11709b04e0. LMArena is not affiliated with RouterPlex.

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