Models / Claude Opus 5

Anthropic

Claude Opus 5

25 published results from 2 sources. Each card shows where the number comes from and what it does not measure. Results are never combined into one score.

Provider: Anthropic
Sources: 2
Our benchmarks: 0
Price: Not yet published

Reported by others

Reported by Arena (formerly LMArena)

0.07

Confirmed task success · rank 4 of 46

Unit: IPS effect estimate, higher is better
Range: 0.04 to 0.09
Sample: 20254 observations
Configuration: Claude Opus 5
Measured: 28 Sep 2026
Not shown: Not a success rate: the estimated effect of choosing this model as the agent's orchestrator, against an even mix of the models tested, inside Arena's own harness.

Reported by Arena (formerly LMArena)

0.10

Confirmed task success · rank 2 of 46

Unit: IPS effect estimate, higher is better
Range: 0.07 to 0.13
Sample: 14987 observations
Configuration: Claude Opus 5
Measured: 28 Sep 2026
Not shown: Not a success rate: the estimated effect of choosing this model as the agent's orchestrator, against an even mix of the models tested, inside Arena's own harness.

Reported by Arena (formerly LMArena)

0.18

Praise over complaint · rank 3 of 46

Unit: IPS effect estimate, higher is better
Range: 0.13 to 0.23
Sample: 8011 observations
Configuration: Claude Opus 5
Measured: 28 Sep 2026
Not shown: Not a success rate: the estimated effect of choosing this model as the agent's orchestrator, against an even mix of the models tested, inside Arena's own harness.

Reported by Arena (formerly LMArena)

0.17

Praise over complaint · rank 3 of 46

Unit: IPS effect estimate, higher is better
Range: 0.11 to 0.22
Sample: 5796 observations
Configuration: Claude Opus 5
Measured: 28 Sep 2026
Not shown: Not a success rate: the estimated effect of choosing this model as the agent's orchestrator, against an even mix of the models tested, inside Arena's own harness.

Reported by Arena (formerly LMArena)

0.11

Steerability · rank 1 of 46

Unit: IPS effect estimate, higher is better
Range: 0.08 to 0.13
Sample: 25690 observations
Configuration: Claude Opus 5
Measured: 28 Sep 2026
Not shown: Not a success rate: the estimated effect of choosing this model as the agent's orchestrator, against an even mix of the models tested, inside Arena's own harness.

Reported by Arena (formerly LMArena)

0.08

Steerability · rank 1 of 46

Unit: IPS effect estimate, higher is better
Range: 0.05 to 0.11
Sample: 17700 observations
Configuration: Claude Opus 5
Measured: 28 Sep 2026
Not shown: Not a success rate: the estimated effect of choosing this model as the agent's orchestrator, against an even mix of the models tested, inside Arena's own harness.

Reported by Arena (formerly LMArena)

0.00

Tool grounding · rank 1 of 46

Unit: IPS effect estimate, higher is better
Range: 0.00 to 0.00
Sample: 3160049 observations
Configuration: Claude Opus 5
Measured: 28 Sep 2026
Not shown: Not a success rate: the estimated effect of choosing this model as the agent's orchestrator, against an even mix of the models tested, inside Arena's own harness.

Reported by Arena (formerly LMArena)

0.00

Tool grounding · rank 1 of 46

Unit: IPS effect estimate, higher is better
Range: 0.00 to 0.00
Sample: 2704226 observations
Configuration: Claude Opus 5
Measured: 28 Sep 2026
Not shown: Not a success rate: the estimated effect of choosing this model as the agent's orchestrator, against an even mix of the models tested, inside Arena's own harness.

Reported by Arena (formerly LMArena)

1,490

Overall · rank 1 of 44

Unit: Arena rating, higher is better
Range: 1,483 to 1,497
Sample: 8794 votes
Configuration: Claude Opus 5 (high)
Measured: 13 Sep 2026
Not shown: Not accuracy or correctness: it ranks which answer voters preferred, with answer length and formatting controlled for.

Reported by Arena (formerly LMArena)

1,477

Overall · rank 7 of 177

Unit: Arena rating, higher is better
Range: 1,474 to 1,480
Sample: 54398 votes
Configuration: Claude Opus 5 (high)
Measured: 25 Sep 2026
Not shown: Not an error rate: claims that cannot be checked on the web are skipped, and preference still carries most of the weight.

Reported by Arena (formerly LMArena)

1,488

Overall · rank 2 of 177

Unit: Arena rating, higher is better
Range: 1,484 to 1,493
Sample: 26471 votes
Configuration: Claude Opus 5 (max)
Measured: 25 Sep 2026
Not shown: Not an error rate: claims that cannot be checked on the web are skipped, and preference still carries most of the weight.

Reported by Arena (formerly LMArena)

1,486

Business, management and finance · rank 6 of 402

Unit: Arena rating, higher is better
Range: 1,479 to 1,493
Sample: 10655 votes
Configuration: Claude Opus 5 (high)
Measured: 25 Sep 2026
Not shown: Not accuracy or correctness: it ranks which answer voters preferred, with answer length and formatting controlled for.

Reported by Arena (formerly LMArena)

1,482

Business, management and finance · rank 7 of 402

Unit: Arena rating, higher is better
Range: 1,473 to 1,491
Sample: 5132 votes
Configuration: Claude Opus 5 (max)
Measured: 25 Sep 2026
Not shown: Not accuracy or correctness: it ranks which answer voters preferred, with answer length and formatting controlled for.

Reported by Arena (formerly LMArena)

1,472

Creative writing · rank 6 of 407

Unit: Arena rating, higher is better
Range: 1,465 to 1,479
Sample: 11902 votes
Configuration: Claude Opus 5 (high)
Measured: 25 Sep 2026
Not shown: Not accuracy or correctness: it ranks which answer voters preferred, with answer length and formatting controlled for.

Reported by Arena (formerly LMArena)

1,470

Creative writing · rank 6 of 407

Unit: Arena rating, higher is better
Range: 1,461 to 1,479
Sample: 5870 votes
Configuration: Claude Opus 5 (max)
Measured: 25 Sep 2026
Not shown: Not accuracy or correctness: it ranks which answer voters preferred, with answer length and formatting controlled for.

Reported by Arena (formerly LMArena)

1,543

Expert prompts · rank 1 of 359

Unit: Arena rating, higher is better
Range: 1,534 to 1,551
Sample: 6288 votes
Configuration: Claude Opus 5 (high)
Measured: 25 Sep 2026
Not shown: Not accuracy or correctness: it ranks which answer voters preferred, with answer length and formatting controlled for.

Reported by Arena (formerly LMArena)

1,527

Expert prompts · rank 2 of 359

Unit: Arena rating, higher is better
Range: 1,516 to 1,539
Sample: 2915 votes
Configuration: Claude Opus 5 (max)
Measured: 25 Sep 2026
Not shown: Not accuracy or correctness: it ranks which answer voters preferred, with answer length and formatting controlled for.

Reported by Arena (formerly LMArena)

1,497

Instruction following · rank 2 of 409

Unit: Arena rating, higher is better
Range: 1,491 to 1,503
Sample: 19769 votes
Configuration: Claude Opus 5 (high)
Measured: 25 Sep 2026
Not shown: Not accuracy or correctness: it ranks which answer voters preferred, with answer length and formatting controlled for.

Reported by Arena (formerly LMArena)

1,493

Instruction following · rank 3 of 409

Unit: Arena rating, higher is better
Range: 1,485 to 1,500
Sample: 9392 votes
Configuration: Claude Opus 5 (max)
Measured: 25 Sep 2026
Not shown: Not accuracy or correctness: it ranks which answer voters preferred, with answer length and formatting controlled for.

Reported by Arena (formerly LMArena)

1,491

Overall · rank 5 of 409

Unit: Arena rating, higher is better
Range: 1,487 to 1,495
Sample: 55063 votes
Configuration: Claude Opus 5 (high)
Measured: 25 Sep 2026
Not shown: Not accuracy or correctness: it ranks which answer voters preferred, with answer length and formatting controlled for.

Reported by Arena (formerly LMArena)

1,488

Overall · rank 7 of 409

Unit: Arena rating, higher is better
Range: 1,483 to 1,493
Sample: 26760 votes
Configuration: Claude Opus 5 (max)
Measured: 25 Sep 2026
Not shown: Not accuracy or correctness: it ranks which answer voters preferred, with answer length and formatting controlled for.

Reported by Arena (formerly LMArena)

1,482

Writing, literature and language · rank 5 of 408

Unit: Arena rating, higher is better
Range: 1,476 to 1,489
Sample: 15394 votes
Configuration: Claude Opus 5 (high)
Measured: 25 Sep 2026
Not shown: Not accuracy or correctness: it ranks which answer voters preferred, with answer length and formatting controlled for.

Reported by Arena (formerly LMArena)

1,480

Writing, literature and language · rank 5 of 408

Unit: Arena rating, higher is better
Range: 1,473 to 1,488
Sample: 7534 votes
Configuration: Claude Opus 5 (max)
Measured: 25 Sep 2026
Not shown: Not accuracy or correctness: it ranks which answer voters preferred, with answer length and formatting controlled for.

Reported by tau2-bench

32.0%

Consistency (pass^4) · rank 2 of 21

Unit: % of tasks, higher is better
Configuration: Claude Opus 5 (max reasoning, tau2)
Measured: 3 Aug 2026
Not shown: Not your policies or customers: the tasks and policies are tau2's own, and the customer is simulated by gpt-5.2.

Reported by tau2-bench

48.7%

Task success (pass^1) · rank 2 of 21

Unit: % of tasks, higher is better
Configuration: Claude Opus 5 (max reasoning, tau2)
Measured: 3 Aug 2026
Not shown: Not your policies or customers: the tasks and policies are tau2's own, and the customer is simulated by gpt-5.2.

Claude Opus 5

Reported by others

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