Model vs model

Claude Opus 5 (Adaptive Reasoning, Xhigh Effort) vs A.X-K2

A debate-ready pair page: current winner, strongest alternative, decisive benchmarks, and the warning that should travel with the claim.

Use case · Everyday chatbot
Winner · Claude Opus 5 (Adaptive Reasoning, Xhigh Effort)
Sources · All public sources

Winner

Claude Opus 5 (Adaptive Reasoning, Xhigh Effort)

Anthropic

0benchmarks won

Chat / text
Reasoning / math / science


Intelligence Index AA · index Text · Chat / text	63n/a exact aliasverified runtimeContext only Row details Raw value 63 Percentile n/a Last updated recent Eligibility benchmark_derived_model Identity provider alias (0.94) Source label Claude Opus 5 (Adaptive Reasoning, Xhigh Effort) Source row	35n/a exact aliasverified runtimeContext only Row details Raw value 35 Percentile n/a Last updated recent Eligibility benchmark_derived_model Identity provider alias (0.94) Source label A.X-K2 Source row	n/a
Coding Index AA · index Code · Coding	77n/a exact aliasverified runtimeContext only Row details Raw value 77 Percentile n/a Last updated recent Eligibility benchmark_derived_model Identity provider alias (0.94) Source label Claude Opus 5 (Adaptive Reasoning, Xhigh Effort) Source row	39n/a exact aliasverified runtimeContext only Row details Raw value 39 Percentile n/a Last updated recent Eligibility benchmark_derived_model Identity provider alias (0.94) Source label A.X-K2 Source row	n/a
Agentic Index AA · index Code · Coding	58n/a exact aliasverified runtimeContext only Row details Raw value 58 Percentile n/a Last updated recent Eligibility benchmark_derived_model Identity provider alias (0.94) Source label Claude Opus 5 (Adaptive Reasoning, Xhigh Effort) Source row	26n/a exact aliasverified runtimeContext only Row details Raw value 26 Percentile n/a Last updated recent Eligibility benchmark_derived_model Identity provider alias (0.94) Source label A.X-K2 Source row	n/a
GPQA AA · % Text · Reasoning / math / science	93.7%n/a exact aliasverified runtimeContext only Row details Raw value 93.7% Percentile n/a Last updated recent Eligibility benchmark_derived_model Identity provider alias (0.94) Source label Claude Opus 5 (Adaptive Reasoning, Xhigh Effort) Source row	85.7%n/a exact aliasverified runtimeContext only Row details Raw value 85.7% Percentile n/a Last updated recent Eligibility benchmark_derived_model Identity provider alias (0.94) Source label A.X-K2 Source row	n/a
Humanity's Last Exam AA · % Text · Reasoning / math / science	54.4%n/a exact aliasverified runtimeContext only Row details Raw value 54.4% Percentile n/a Last updated recent Eligibility benchmark_derived_model Identity provider alias (0.94) Source label Claude Opus 5 (Adaptive Reasoning, Xhigh Effort) Source row	29.6%n/a exact aliasverified runtimeContext only Row details Raw value 29.6% Percentile n/a Last updated recent Eligibility benchmark_derived_model Identity provider alias (0.94) Source label A.X-K2 Source row	n/a
CritPt AA · % Text · Reasoning / math / science	27.7%n/a exact aliasverified runtimeContext only Row details Raw value 27.7% Percentile n/a Last updated recent Eligibility benchmark_derived_model Identity provider alias (0.94) Source label Claude Opus 5 (Adaptive Reasoning, Xhigh Effort) Source row	8.9%n/a exact aliasverified runtimeContext only Row details Raw value 8.9% Percentile n/a Last updated recent Eligibility benchmark_derived_model Identity provider alias (0.94) Source label A.X-K2 Source row	n/a
SciCode AA · % Code · Coding	55%n/a exact aliasverified runtimeContext only Row details Raw value 55% Percentile n/a Last updated recent Eligibility benchmark_derived_model Identity provider alias (0.94) Source label Claude Opus 5 (Adaptive Reasoning, Xhigh Effort) Source row	38.5%n/a exact aliasverified runtimeContext only Row details Raw value 38.5% Percentile n/a Last updated recent Eligibility benchmark_derived_model Identity provider alias (0.94) Source label A.X-K2 Source row	n/a
AA-Omniscience accuracy AA · % Text · Chat / text	59.5%n/a exact aliasverified runtimeContext only Row details Raw value 59.5% Percentile n/a Last updated recent Eligibility benchmark_derived_model Identity provider alias (0.94) Source label Claude Opus 5 (Adaptive Reasoning, Xhigh Effort) Source row	18.6%n/a exact aliasverified runtimeContext only Row details Raw value 18.6% Percentile n/a Last updated recent Eligibility benchmark_derived_model Identity provider alias (0.94) Source label A.X-K2 Source row	n/a
AA-Omniscience non-hallucination AA · % Text · Chat / text	40.5%n/a exact aliasverified runtimeContext only Row details Raw value 40.5% Percentile n/a Last updated recent Eligibility benchmark_derived_model Identity provider alias (0.94) Source label Claude Opus 5 (Adaptive Reasoning, Xhigh Effort) Source row	67%n/a exact aliasverified runtimeContext only Row details Raw value 67% Percentile n/a Last updated recent Eligibility benchmark_derived_model Identity provider alias (0.94) Source label A.X-K2 Source row	n/a
GDPval-AA AA · rating Text · Professional reasoning	1,814n/a exact aliasverified runtimeContext only Row details Raw value 1,814 Percentile n/a Last updated recent Eligibility benchmark_derived_model Identity provider alias (0.94) Source label Claude Opus 5 (Adaptive Reasoning, Xhigh Effort) Source row	1,109n/a exact aliasverified runtimeContext only Row details Raw value 1,109 Percentile n/a Last updated recent Eligibility benchmark_derived_model Identity provider alias (0.94) Source label A.X-K2 Source row	n/a
Long Context Reasoning AA · % Document · Long context	76.3%n/a exact aliasverified runtimeContext only Row details Raw value 76.3% Percentile n/a Last updated recent Eligibility benchmark_derived_model Identity provider alias (0.94) Source label Claude Opus 5 (Adaptive Reasoning, Xhigh Effort) Source row	66%n/a exact aliasverified runtimeContext only Row details Raw value 66% Percentile n/a Last updated recent Eligibility benchmark_derived_model Identity provider alias (0.94) Source label A.X-K2 Source row	n/a

Intelligence Index

AA · index

Text · Chat / text

63n/a

exact aliasverified runtimeContext only

Row details

Raw value: 63
Percentile: n/a
Last updated: recent
Eligibility: benchmark_derived_model
Identity: provider alias (0.94)
Source label: Claude Opus 5 (Adaptive Reasoning, Xhigh Effort)

Source row

35n/a

exact aliasverified runtimeContext only

Row details

Raw value: 35
Percentile: n/a
Last updated: recent
Eligibility: benchmark_derived_model
Identity: provider alias (0.94)
Source label: A.X-K2

Source row

n/a

Coding Index

AA · index

Code · Coding

77n/a

exact aliasverified runtimeContext only

Row details

Raw value: 77
Percentile: n/a
Last updated: recent
Eligibility: benchmark_derived_model
Identity: provider alias (0.94)
Source label: Claude Opus 5 (Adaptive Reasoning, Xhigh Effort)

Source row

39n/a

exact aliasverified runtimeContext only

Row details

Raw value: 39
Percentile: n/a
Last updated: recent
Eligibility: benchmark_derived_model
Identity: provider alias (0.94)
Source label: A.X-K2

Source row

n/a

Agentic Index

AA · index

Code · Coding

58n/a

exact aliasverified runtimeContext only

Row details

Raw value: 58
Percentile: n/a
Last updated: recent
Eligibility: benchmark_derived_model
Identity: provider alias (0.94)
Source label: Claude Opus 5 (Adaptive Reasoning, Xhigh Effort)

Source row

26n/a

exact aliasverified runtimeContext only

Row details

Raw value: 26
Percentile: n/a
Last updated: recent
Eligibility: benchmark_derived_model
Identity: provider alias (0.94)
Source label: A.X-K2

Source row

n/a

GPQA

AA · %

Text · Reasoning / math / science

93.7%n/a

exact aliasverified runtimeContext only

Row details

Raw value: 93.7%
Percentile: n/a
Last updated: recent
Eligibility: benchmark_derived_model
Identity: provider alias (0.94)
Source label: Claude Opus 5 (Adaptive Reasoning, Xhigh Effort)

Source row

85.7%n/a

exact aliasverified runtimeContext only

Row details

Raw value: 85.7%
Percentile: n/a
Last updated: recent
Eligibility: benchmark_derived_model
Identity: provider alias (0.94)
Source label: A.X-K2

Source row

n/a

Humanity's Last Exam

AA · %

Text · Reasoning / math / science

54.4%n/a

exact aliasverified runtimeContext only

Row details

Raw value: 54.4%
Percentile: n/a
Last updated: recent
Eligibility: benchmark_derived_model
Identity: provider alias (0.94)
Source label: Claude Opus 5 (Adaptive Reasoning, Xhigh Effort)

Source row

29.6%n/a

exact aliasverified runtimeContext only

Row details

Raw value: 29.6%
Percentile: n/a
Last updated: recent
Eligibility: benchmark_derived_model
Identity: provider alias (0.94)
Source label: A.X-K2

Source row

n/a

CritPt

AA · %

Text · Reasoning / math / science

27.7%n/a

exact aliasverified runtimeContext only

Row details

Raw value: 27.7%
Percentile: n/a
Last updated: recent
Eligibility: benchmark_derived_model
Identity: provider alias (0.94)
Source label: Claude Opus 5 (Adaptive Reasoning, Xhigh Effort)

Source row

8.9%n/a

exact aliasverified runtimeContext only

Row details

Raw value: 8.9%
Percentile: n/a
Last updated: recent
Eligibility: benchmark_derived_model
Identity: provider alias (0.94)
Source label: A.X-K2

Source row

n/a

SciCode

AA · %

Code · Coding

55%n/a

exact aliasverified runtimeContext only

Row details

Raw value: 55%
Percentile: n/a
Last updated: recent
Eligibility: benchmark_derived_model
Identity: provider alias (0.94)
Source label: Claude Opus 5 (Adaptive Reasoning, Xhigh Effort)

Source row

38.5%n/a

exact aliasverified runtimeContext only

Row details

Raw value: 38.5%
Percentile: n/a
Last updated: recent
Eligibility: benchmark_derived_model
Identity: provider alias (0.94)
Source label: A.X-K2

Source row

n/a

AA-Omniscience accuracy

AA · %

Text · Chat / text

59.5%n/a

exact aliasverified runtimeContext only

Row details

Raw value: 59.5%
Percentile: n/a
Last updated: recent
Eligibility: benchmark_derived_model
Identity: provider alias (0.94)
Source label: Claude Opus 5 (Adaptive Reasoning, Xhigh Effort)

Source row

18.6%n/a

exact aliasverified runtimeContext only

Row details

Raw value: 18.6%
Percentile: n/a
Last updated: recent
Eligibility: benchmark_derived_model
Identity: provider alias (0.94)
Source label: A.X-K2

Source row

n/a

AA-Omniscience non-hallucination

AA · %

Text · Chat / text

40.5%n/a

exact aliasverified runtimeContext only

Row details

Raw value: 40.5%
Percentile: n/a
Last updated: recent
Eligibility: benchmark_derived_model
Identity: provider alias (0.94)
Source label: Claude Opus 5 (Adaptive Reasoning, Xhigh Effort)

Source row

67%n/a

exact aliasverified runtimeContext only

Row details

Raw value: 67%
Percentile: n/a
Last updated: recent
Eligibility: benchmark_derived_model
Identity: provider alias (0.94)
Source label: A.X-K2

Source row

n/a

GDPval-AA

AA · rating

Text · Professional reasoning

1,814n/a

exact aliasverified runtimeContext only

Row details

Raw value: 1,814
Percentile: n/a
Last updated: recent
Eligibility: benchmark_derived_model
Identity: provider alias (0.94)
Source label: Claude Opus 5 (Adaptive Reasoning, Xhigh Effort)

Source row

1,109n/a

exact aliasverified runtimeContext only

Row details

Raw value: 1,109
Percentile: n/a
Last updated: recent
Eligibility: benchmark_derived_model
Identity: provider alias (0.94)
Source label: A.X-K2

Source row

n/a

Long Context Reasoning

AA · %

Document · Long context

76.3%n/a

exact aliasverified runtimeContext only

Row details

Raw value: 76.3%
Percentile: n/a
Last updated: recent
Eligibility: benchmark_derived_model
Identity: provider alias (0.94)
Source label: Claude Opus 5 (Adaptive Reasoning, Xhigh Effort)

Source row

66%n/a

exact aliasverified runtimeContext only

Row details

Raw value: 66%
Percentile: n/a
Last updated: recent
Eligibility: benchmark_derived_model
Identity: provider alias (0.94)
Source label: A.X-K2

Source row

n/a

Claude Opus 5 (Adaptive Reasoning, Xhigh Effort) vs A.X-K2

Claude Opus 5 (Adaptive Reasoning, Xhigh Effort)

Loading model comparison.

Claude Opus 5 (Adaptive Reasoning, Xhigh Effort) vs A.X-K2

Claude Opus 5 (Adaptive Reasoning, Xhigh Effort)

Claude Opus 5 (Adaptive Reasoning, Xhigh Effort) leads this compare set for everyday chatbot.

A.X-K2

Claude Opus 5 (Adaptive Reasoning, Xhigh Effort) case

A.X-K2 case

What changes the outcome

Why this result is surprising

Why this is not a clean win

Decisive benchmarks

Claude Opus 5 (Adaptive Reasoning, Xhigh Effort) vs A.X-K2

Claude Opus 5 (Adaptive Reasoning, Xhigh Effort)

Loading model comparison.

Claude Opus 5 (Adaptive Reasoning, Xhigh Effort) vs A.X-K2

Claude Opus 5 (Adaptive Reasoning, Xhigh Effort)

Claude Opus 5 (Adaptive Reasoning, Xhigh Effort) leads this compare set for everyday chatbot.

A.X-K2

Claude Opus 5 (Adaptive Reasoning, Xhigh Effort) case

A.X-K2 case

What changes the outcome

Why this result is surprising

Why this is not a clean win

Share the recommendation with the source data attached.

Open or copy the stable surfaces

Use the exact public framing

Pick the voice before you post

Compose a post that keeps the warning attached

Decisive benchmarks