Model vs model

GPT-5.5 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 · GPT-5.5
Sources · All public sources

Winner

GPT-5.5

OpenAI

11benchmarks won

Professional reasoning

Versus · Everyday chatbot

GPT-5.5 leads this compare set for everyday chatbot.

GPT-5.511 of 11 wins

Verified but aging

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

Model vs model

GPT-5.5 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 · GPT-5.5
Sources · All public sources

Winner

GPT-5.5

OpenAI

11benchmarks won

Professional reasoning

Versus · Everyday chatbot

GPT-5.5 leads this compare set for everyday chatbot.

GPT-5.511 of 11 wins

Verified but aging

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


Intelligence Index AA · index Text · Chat / text	3687% exact aliasverified runtime Row details Raw value 36 Percentile 87% Last updated recent Eligibility headline eligible Identity provider alias (0.94) Source label GPT-5.5 (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	5677.1% exact aliasverified runtime Row details Raw value 56 Percentile 77.1% Last updated recent Eligibility headline eligible Identity provider alias (0.94) Source label GPT-5.5 (Non-reasoning) 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	2658.2% exact aliasverified runtime Row details Raw value 26 Percentile 58.2% Last updated recent Eligibility headline eligible Identity provider alias (0.94) Source label GPT-5.5 (Non-reasoning) 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	76.8%72.3% exact aliasverified runtime Row details Raw value 76.8% Percentile 72.3% Last updated recent Eligibility headline eligible Identity provider alias (0.94) Source label GPT-5.5 (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	13.7%75.3% exact aliasverified runtime Row details Raw value 13.7% Percentile 75.3% Last updated recent Eligibility headline eligible Identity provider alias (0.94) Source label GPT-5.5 (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	1.4%81.4% exact aliasverified runtime Row details Raw value 1.4% Percentile 81.4% Last updated recent Eligibility headline eligible Identity provider alias (0.94) Source label GPT-5.5 (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	47.3%92.5% exact aliasverified runtime Row details Raw value 47.3% Percentile 92.5% Last updated recent Eligibility headline eligible Identity provider alias (0.94) Source label GPT-5.5 (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	45.6%93.7% exact aliasverified runtime Row details Raw value 45.6% Percentile 93.7% Last updated recent Eligibility headline eligible Identity provider alias (0.94) Source label GPT-5.5 (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	7.3%19.7% exact aliasverified runtime Row details Raw value 7.3% Percentile 19.7% Last updated recent Eligibility headline eligible Identity provider alias (0.94) Source label GPT-5.5 (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	1,12464.1% exact aliasverified runtime Row details Raw value 1,124 Percentile 64.1% Last updated recent Eligibility headline eligible Identity provider alias (0.94) Source label GPT-5.5 (Non-reasoning) 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	58%70.3% exact aliasverified runtime Row details Raw value 58% Percentile 70.3% Last updated recent Eligibility headline eligible Identity provider alias (0.94) Source label GPT-5.5 (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

Intelligence Index

AA · index

Text · Chat / text

3687%

exact aliasverified runtime

Row details

Raw value: 36
Percentile: 87%
Last updated: recent
Eligibility: headline eligible
Identity: provider alias (0.94)
Source label: GPT-5.5 (Non-reasoning)

GPT-5.5 vs A.X-K2

GPT-5.5

GPT-5.5 leads this compare set for everyday chatbot.

Loading model comparison.

GPT-5.5 vs A.X-K2

GPT-5.5

GPT-5.5 leads this compare set for everyday chatbot.

A.X-K2

GPT-5.5 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