Model vs model

Claude Opus 4.8 vs Agnes 2.5 Pro Alpha

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 4.8
Sources · All public sources

Winner

Claude Opus 4.8

Anthropic

17benchmarks won

Professional reasoning

Versus · Everyday chatbot

Claude Opus 4.8 leads this compare set for everyday chatbot.

Claude Opus 4.817 of 17 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

Agnes 2.5 Pro Alpha

Unknown

0benchmarks won

Reasoning / math / science

The cases in full

Claude Opus 4.8 case

Professional reasoning

Agnes 2.5 Pro Alpha case

Reasoning / math / science

What changes the outcome

Claude Opus 4.8: 87 visible benchmark gaps still leave room for the result to move.
Agnes 2.5 Pro Alpha: 121 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.
Agnes 2.5 Pro Alpha remains the strongest alternative once you change use case, mode, or missing-evidence assumptions.

Open full compare workspace Open evidence page Open disagreement page

Advanced framings and X composerNeutral, contrarian, open-model, and skeptical variants

Neutral analystLead with the recommendation, then attach the reason and warning.Claude Opus 4.8 leads this compare set for everyday chatbot.

ContrarianPush against the easy read and keep the strongest alternative live.Contrarian take: Claude Opus 4.8 leads this compare set for everyday chatbot.

Open-model angleBias the framing toward open weights and source transparency.Open-model angle: Model compare · Claude Opus 4.8 vs Agnes 2.5 Pro Alpha

Don't trust the headlineLead with the warning before you let the claim travel.Don't trust the headline: Model compare · Claude Opus 4.8 vs Agnes 2.5 Pro Alpha

Decisive benchmarks

17 of 138 benchmarks


Intelligence Index AA · index Text · Chat / text	5797.9% exact aliasverified runtime Row details Raw value 57 Percentile 97.9% Last updated recent Eligibility headline eligible Identity provider alias (0.94) Source label Claude Opus 4.8 (Adaptive Reasoning, Max Effort) Source row	40n/a exact aliasverified runtimeContext only Row details Raw value 40 Percentile n/a Last updated recent Eligibility preview_model Identity provider alias (0.94) Source label Agnes 2.5 Pro Alpha Source row	n/a
Time to first token AA · s Text · Chat / text	22.30s10.7% exact aliasverified runtime Row details Raw value 22.30s Percentile 10.7% Last updated recent Eligibility headline eligible Identity provider alias (0.94) Source label Claude Opus 4.8 (Adaptive Reasoning, Max Effort) Source row	2.09sn/a exact aliasverified runtimeContext only Row details Raw value 2.09s Percentile n/a Last updated recent Eligibility preview_model Identity provider alias (0.94) Source label Agnes 2.5 Pro Alpha Source row	n/a
Coding Index AA · index Code · Coding	7495.2% exact aliasverified runtime Row details Raw value 74 Percentile 95.2% Last updated recent Eligibility headline eligible Identity provider alias (0.94) Source label Claude Opus 4.8 (Adaptive Reasoning, Max Effort) Source row	59n/a exact aliasverified runtimeContext only Row details Raw value 59 Percentile n/a Last updated recent Eligibility preview_model Identity provider alias (0.94) Source label Agnes 2.5 Pro Alpha Source row	n/a
Agentic Index AA · index Code · Coding	4991% exact aliasverified runtime Row details Raw value 49 Percentile 91% Last updated recent Eligibility headline eligible Identity provider alias (0.94) Source label Claude Opus 4.8 (Adaptive Reasoning, Max Effort) Source row	25n/a exact aliasverified runtimeContext only Row details Raw value 25 Percentile n/a Last updated recent Eligibility preview_model Identity provider alias (0.94) Source label Agnes 2.5 Pro Alpha Source row	n/a
Output Speed AA · tokens/s Text · Chat / text	54.4 tokens/s22.3% exact aliasverified runtime Row details Raw value 54.4 tokens/s Percentile 22.3% Last updated recent Eligibility headline eligible Identity provider alias (0.94) Source label Claude Opus 4.8 (Adaptive Reasoning, Max Effort) Source row	132 tokens/sn/a exact aliasverified runtimeContext only Row details Raw value 132 tokens/s Percentile n/a Last updated recent Eligibility preview_model Identity provider alias (0.94) Source label Agnes 2.5 Pro Alpha Source row	n/a
Time to first answer token AA · s Text · Chat / text	22.30s37.5% exact aliasverified runtime Row details Raw value 22.30s Percentile 37.5% Last updated recent Eligibility headline eligible Identity provider alias (0.94) Source label Claude Opus 4.8 (Adaptive Reasoning, Max Effort) Source row	17.24sn/a exact aliasverified runtimeContext only Row details Raw value 17.24s Percentile n/a Last updated recent Eligibility preview_model Identity provider alias (0.94) Source label Agnes 2.5 Pro Alpha Source row	n/a
Blended price AA · /1M tokens Text · Chat / text	$10 /1M tokens7.6% exact aliasverified runtime Row details Raw value $10 /1M tokens Percentile 7.6% Last updated recent Eligibility headline eligible Identity provider alias (0.94) Source label Claude Opus 4.8 (Adaptive Reasoning, Max Effort) Source row	$0.6 /1M tokensn/a exact aliasverified runtimeContext only Row details Raw value $0.6 /1M tokens Percentile n/a Last updated recent Eligibility preview_model Identity provider alias (0.94) Source label Agnes 2.5 Pro Alpha Source row	n/a
Input price AA · /1M input tokens Text · Chat / text	$5 /1M input tokens8% exact aliasverified runtime Row details Raw value $5 /1M input tokens Percentile 8% Last updated recent Eligibility headline eligible Identity provider alias (0.94) Source label Claude Opus 4.8 (Adaptive Reasoning, Max Effort) Source row	$0.5 /1M input tokensn/a exact aliasverified runtimeContext only Row details Raw value $0.5 /1M input tokens Percentile n/a Last updated recent Eligibility preview_model Identity provider alias (0.94) Source label Agnes 2.5 Pro Alpha Source row	n/a
Output price AA · /1M output tokens Text · Chat / text	$25 /1M output tokens7.6% exact aliasverified runtime Row details Raw value $25 /1M output tokens Percentile 7.6% Last updated recent Eligibility headline eligible Identity provider alias (0.94) Source label Claude Opus 4.8 (Adaptive Reasoning, Max Effort) Source row	$0.9 /1M output tokensn/a exact aliasverified runtimeContext only Row details Raw value $0.9 /1M output tokens Percentile n/a Last updated recent Eligibility preview_model Identity provider alias (0.94) Source label Agnes 2.5 Pro Alpha Source row	n/a
GPQA AA · % Text · Reasoning / math / science	92%96.7% exact aliasverified runtime Row details Raw value 92% Percentile 96.7% Last updated recent Eligibility headline eligible Identity provider alias (0.94) Source label Claude Opus 4.8 (Adaptive Reasoning, Max Effort) Source row	87.6%n/a exact aliasverified runtimeContext only Row details Raw value 87.6% Percentile n/a Last updated recent Eligibility preview_model Identity provider alias (0.94) Source label Agnes 2.5 Pro Alpha Source row	n/a
Humanity's Last Exam AA · % Text · Reasoning / math / science	48.7%98.9% exact aliasverified runtime Row details Raw value 48.7% Percentile 98.9% Last updated recent Eligibility headline eligible Identity provider alias (0.94) Source label Claude Opus 4.8 (Adaptive Reasoning, Max Effort) Source row	33.6%n/a exact aliasverified runtimeContext only Row details Raw value 33.6% Percentile n/a Last updated recent Eligibility preview_model Identity provider alias (0.94) Source label Agnes 2.5 Pro Alpha Source row	n/a
CritPt AA · % Text · Reasoning / math / science	20.9%97.3% exact aliasverified runtime Row details Raw value 20.9% Percentile 97.3% Last updated recent Eligibility headline eligible Identity provider alias (0.94) Source label Claude Opus 4.8 (Adaptive Reasoning, Max Effort) Source row	10.9%n/a exact aliasverified runtimeContext only Row details Raw value 10.9% Percentile n/a Last updated recent Eligibility preview_model Identity provider alias (0.94) Source label Agnes 2.5 Pro Alpha Source row	n/a

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Intelligence Index

AA · index

Text · Chat / text

5797.9%

exact aliasverified runtime

Row details

Raw value: 57
Percentile: 97.9%
Last updated: recent
Eligibility: headline eligible
Identity: provider alias (0.94)
Source label: Claude Opus 4.8 (Adaptive Reasoning, Max Effort)

Claude Opus 4.8 vs Agnes 2.5 Pro Alpha

Claude Opus 4.8

Claude Opus 4.8 leads this compare set for everyday chatbot.

Agnes 2.5 Pro Alpha

Claude Opus 4.8 case

Agnes 2.5 Pro Alpha 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 Opus 4.8 vs Agnes 2.5 Pro Alpha

Claude Opus 4.8

Claude Opus 4.8 leads this compare set for everyday chatbot.

Agnes 2.5 Pro Alpha

Claude Opus 4.8 case

Agnes 2.5 Pro Alpha 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