Model vs model

Claude Haiku 4.5 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 Haiku 4.5
Sources · All public sources

Winner

Claude Haiku 4.5

Anthropic

9benchmarks won

Chat / text

Versus · Everyday chatbot

Claude Haiku 4.5 leads this compare set for everyday chatbot.

Claude Haiku 4.59 of 9 wins

Verified and stable

0 shared benchmarks are still too close to call, so the win stays conditional. This compare uses all public sources, with provider-official evidence labeled separately.

Close calls: 0
Sources: All public

Full compare workspace Disagreement page

100%win share

Challenger

A.X-K2

Unknown

0benchmarks won

Chat / text
Reasoning / math / science

The cases in full

Claude Haiku 4.5 case

Chat / text

A.X-K2 case

Chat / text
Reasoning / math / science

What changes the outcome

Claude Haiku 4.5: 88 visible benchmark gaps still leave room for the result to move.
A.X-K2: 126 visible benchmark gaps still leave room for the result to move.

Why this result is surprising

The visible shared evidence is more decisive than usual for this compare set.
Very few shared benchmarks are decisively separating these models.

Why this is not a clean win

0 shared benchmarks are still too close to call, so the win stays conditional. This compare uses all public sources, with provider-official evidence labeled separately.
A.X-K2 remains the strongest alternative once you change use case, mode, or missing-evidence assumptions.

Open full compare workspace Open evidence page Open disagreement page

Decisive benchmarks

11 of 138 benchmarks


Intelligence Index AA · index Text · Chat / text	2472% exact aliasverified runtime Row details Raw value 24 Percentile 72% Last updated recent Eligibility headline eligible Identity provider alias (0.94) Source label Claude 4.5 Haiku (Non-reasoning) 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	16n/a proxy backfilledbackfilledContext only Row details Raw value 16 Percentile n/a Last updated recent Eligibility Fallback benchmark identity is visible for context but excluded from default ranking. Identity benchmark proxy (0.58) Source label Claude 3.5 Haiku 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
Openness Index AA · index Text · Chat / text	1111.3% exact aliasverified runtime Row details Raw value 11 Percentile 11.3% Last updated recent Eligibility headline eligible Identity provider alias (0.94) Source label Claude 4.5 Haiku (Non-reasoning) Source row	50n/a exact aliasverified runtimeContext only Row details Raw value 50 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	64.6%49.4% exact aliasverified runtime Row details Raw value 64.6% Percentile 49.4% Last updated recent Eligibility headline eligible Identity provider alias (0.94) Source label Claude 4.5 Haiku (Non-reasoning) 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	4.2%23.3% exact aliasverified runtime Row details Raw value 4.2% Percentile 23.3% Last updated recent Eligibility headline eligible Identity provider alias (0.94) Source label Claude 4.5 Haiku (Non-reasoning) 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	0%60.3% exact aliasverified runtime Row details Raw value 0% Percentile 60.3% Last updated recent Eligibility headline eligible Identity provider alias (0.94) Source label Claude 4.5 Haiku (Non-reasoning) 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	34.4%58.8% exact aliasverified runtime Row details Raw value 34.4% Percentile 58.8% Last updated recent Eligibility headline eligible Identity provider alias (0.94) Source label Claude 4.5 Haiku (Non-reasoning) 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	14.4%29% exact aliasverified runtime Row details Raw value 14.4% Percentile 29% Last updated recent Eligibility headline eligible Identity provider alias (0.94) Source label Claude 4.5 Haiku (Non-reasoning) 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	74.3%97.5% exact aliasverified runtime Row details Raw value 74.3% Percentile 97.5% Last updated recent Eligibility headline eligible Identity provider alias (0.94) Source label Claude 4.5 Haiku (Non-reasoning) 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	457n/a proxy backfilledbackfilledContext only Row details Raw value 457 Percentile n/a Last updated recent Eligibility Fallback benchmark identity is visible for context but excluded from default ranking. Identity benchmark proxy (0.58) Source label Claude 3.5 Haiku 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	48.3%61.7% exact aliasverified runtime Row details Raw value 48.3% Percentile 61.7% Last updated recent Eligibility headline eligible Identity provider alias (0.94) Source label Claude 4.5 Haiku (Non-reasoning) 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

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Intelligence Index

AA · index

Text · Chat / text

2472%

exact aliasverified runtime

Row details

Raw value: 24
Percentile: 72%
Last updated: recent
Eligibility: headline eligible
Identity: provider alias (0.94)
Source label: Claude 4.5 Haiku (Non-reasoning)

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

16n/a

proxy backfilledbackfilledContext only

Row details

Raw value: 16
Percentile: n/a
Last updated: recent
Eligibility: Fallback benchmark identity is visible for context but excluded from default ranking.
Identity: benchmark proxy (0.58)
Source label: Claude 3.5 Haiku

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

Openness Index

AA · index

Text · Chat / text

1111.3%

exact aliasverified runtime

Row details

Raw value: 11
Percentile: 11.3%
Last updated: recent
Eligibility: headline eligible
Identity: provider alias (0.94)
Source label: Claude 4.5 Haiku (Non-reasoning)

Source row

50n/a

exact aliasverified runtimeContext only

Row details

Raw value: 50
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

64.6%49.4%

exact aliasverified runtime

Row details

Raw value: 64.6%
Percentile: 49.4%
Last updated: recent
Eligibility: headline eligible
Identity: provider alias (0.94)
Source label: Claude 4.5 Haiku (Non-reasoning)

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

4.2%23.3%

exact aliasverified runtime

Row details

Raw value: 4.2%
Percentile: 23.3%
Last updated: recent
Eligibility: headline eligible
Identity: provider alias (0.94)
Source label: Claude 4.5 Haiku (Non-reasoning)

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

0%60.3%

exact aliasverified runtime

Row details

Raw value: 0%
Percentile: 60.3%
Last updated: recent
Eligibility: headline eligible
Identity: provider alias (0.94)
Source label: Claude 4.5 Haiku (Non-reasoning)

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

34.4%58.8%

exact aliasverified runtime

Row details

Raw value: 34.4%
Percentile: 58.8%
Last updated: recent
Eligibility: headline eligible
Identity: provider alias (0.94)
Source label: Claude 4.5 Haiku (Non-reasoning)

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

14.4%29%

exact aliasverified runtime

Row details

Raw value: 14.4%
Percentile: 29%
Last updated: recent
Eligibility: headline eligible
Identity: provider alias (0.94)
Source label: Claude 4.5 Haiku (Non-reasoning)

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

74.3%97.5%

exact aliasverified runtime

Row details

Raw value: 74.3%
Percentile: 97.5%
Last updated: recent
Eligibility: headline eligible
Identity: provider alias (0.94)
Source label: Claude 4.5 Haiku (Non-reasoning)

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

457n/a

proxy backfilledbackfilledContext only

Row details

Raw value: 457
Percentile: n/a
Last updated: recent
Eligibility: Fallback benchmark identity is visible for context but excluded from default ranking.
Identity: benchmark proxy (0.58)
Source label: Claude 3.5 Haiku

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

48.3%61.7%

exact aliasverified runtime

Row details

Raw value: 48.3%
Percentile: 61.7%
Last updated: recent
Eligibility: headline eligible
Identity: provider alias (0.94)
Source label: Claude 4.5 Haiku (Non-reasoning)

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 Haiku 4.5 vs A.X-K2

Claude Haiku 4.5

Claude Haiku 4.5 leads this compare set for everyday chatbot.

A.X-K2

Claude Haiku 4.5 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

Loading model comparison.

Claude Haiku 4.5 vs A.X-K2

Claude Haiku 4.5

Claude Haiku 4.5 leads this compare set for everyday chatbot.

A.X-K2

Claude Haiku 4.5 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