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Model comparison

Claude Opus 4.5 vs Gemma 4 12B

Data verified

Head-to-head evidence from 17 shared benchmark results across 7 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.

64.22/100
Margin
16.9pts
← winning
47.29/100
2 category wins2 category wins

Public leaderboard positions: Claude Opus 4.5 #34 (Supported); Gemma 4 12B #137 (Estimated). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.

Evidence parity. Claude Opus 4.5 and Gemma 4 12B share 17 comparable benchmark results. 4 of 8 categories are comparable. 42 results are unique to Claude Opus 4.5; 6 to Gemma 4 12B.

Updated July 23, 2026
Shared results
17
Claude Opus 4.5 only
42
Gemma 4 12B only
6
Comparable categories
4 / 8

Pick Claude Opus 4.5 if you want the stronger benchmark profile. Gemma 4 12B only becomes the better choice if mathematics is the priority or you need the larger 256K context window.

Confidence note. This is a partial-evidence comparison with 17 shared benchmark results across 7 evidence categories; 4 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.

Why this result

Claude Opus 4.5 is clearly ahead on the BenchAlign aggregate, 64.22 to 47.29. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.

Claude Opus 4.5's sharpest advantage is in reasoning, where it averages 64.4 against 43.4. The single biggest benchmark swing on the page is AIME26, 95.1% to 77.5%. Gemma 4 12B does hit back in mathematics, so the answer changes if that is the part of the workload you care about most.

Gemma 4 12B is the reasoning model in the pair, while Claude Opus 4.5 is not. That usually helps on harder chain-of-thought-heavy tests, but it can also mean more latency and more token spend in real use. Gemma 4 12B gives you the larger context window at 256K, compared with 200K for Claude Opus 4.5.

Category breakdown

Exact category averages are shown below. Not measured means BenchLM does not have enough sourced public coverage for that model and category.

Category scores and score margins for Claude Opus 4.5 and Gemma 4 12B
CategoryClaude Opus 4.5ΔGemma 4 12B
ReasoningClaude Opus 4.564.4Margin← 21.0Gemma 4 12B43.4
MathClaude Opus 4.557.5Margin→ 20.0Gemma 4 12B77.5
KnowledgeClaude Opus 4.558.1Margin→ 19.4Gemma 4 12B77.5
MultimodalClaude Opus 4.569.9Margin← 0.8Gemma 4 12B69.1
AgenticClaude Opus 4.562.6MarginNo overlapGemma 4 12BNot measured
CodingClaude Opus 4.571.7MarginNo overlapGemma 4 12BNot measured
MultilingualClaude Opus 4.585.7MarginNo overlapGemma 4 12BNot measured
Inst. FollowingClaude Opus 4.569.5MarginNo overlapGemma 4 12BNot measured

Decisive benchmark drivers

The largest measured benchmark gaps in this matchup, with exact reported values.

More
A · Claude Opus 4.5B · Gemma 4 12B

  1. AIME26

    Math
    Source ↗
    A 95.1%B 77.5%
    Winner: Claude Opus 4.5Δ 17.6
    AIME26: Claude Opus 4.5 scored 95.1%; Gemma 4 12B scored 77.5%. Claude Opus 4.5 wins this benchmark.

  2. MMLU-Pro

    Knowledge
    Source ↗
    A 89.5%B 77.2%
    Winner: Claude Opus 4.5Δ 12.3
    MMLU-Pro: Claude Opus 4.5 scored 89.5%; Gemma 4 12B scored 77.2%. Claude Opus 4.5 wins this benchmark.

  3. GPQA

    Knowledge
    Source ↗
    A 87%B 78.8%
    Winner: Claude Opus 4.5Δ 8.2
    GPQA: Claude Opus 4.5 scored 87%; Gemma 4 12B scored 78.8%. Claude Opus 4.5 wins this benchmark.

  4. MMMU-Pro

    Multimodal
    Source ↗
    A 70.6%B 69.1%
    Winner: Claude Opus 4.5Δ 1.5
    MMMU-Pro: Claude Opus 4.5 scored 70.6%; Gemma 4 12B scored 69.1%. Claude Opus 4.5 wins this benchmark.

Operational comparison

Runtime and commercial metrics are compared only when both models have a complete sourced value.

MetricClaude Opus 4.5Gemma 4 12BComparison
Input / output priceUSD per 1M tokensClaude Opus 4.5$5 input / $25 outputGemma 4 12BNot availableA complete price comparison is not available.
Generation speedtokens per secondClaude Opus 4.546 tok/sGemma 4 12BNot availableA complete speed comparison is not available.
First-answer latencyseconds to first tokenClaude Opus 4.51.01 sGemma 4 12BNot availableA complete latency comparison is not available.
Context windowmaximum listed tokensClaude Opus 4.5200KGemma 4 12B256KGemma 4 12B lists the larger context window.

Benchmark Deep Dive

Agentic
BenchmarkClaude Opus 4.5Gemma 4 12BResult
Terminal-Bench 2.0Source 59.3%—Not comparable
OSWorld-VerifiedSource 66.3%—Not comparable
OSWorldSource 66.3%—Not comparable
Claw-EvalSource 59.6%—Not comparable
QwenClawBenchSource 52.3%—Not comparable
τ³-bench resultsSource 70.2%—Not comparable
VITA-BenchSource 23.3%—Not comparable
DeepPlanningSource 26.4%—Not comparable
ToolathlonSource 43.5%—Not comparable
MCP AtlasSource 42.3%—Not comparable
MCP-TasksSource 71.8%—Not comparable
WideResearchSource 76.4%—Not comparable
CyberGymSource 50.6%—Not comparable
τ²-bench resultsSource 86.3%36.3%Claude Opus 4.5 leads
Gert LabsSource 64.23%—Not comparable
JobBenchSource 32.3%—Not comparable
Coding
BenchmarkClaude Opus 4.5Gemma 4 12BResult
SWE-bench VerifiedSource 80.9%—Not comparable
LiveCodeBench v6Source 84.8%—Not comparable
SWE-bench ProSource 57.1%—Not comparable
SWE MultilingualSource 77.5%—Not comparable
NL2RepoSource 43.2%—Not comparable
AA-SciCodeSource 47.0%38.2%Claude Opus 4.5 leads
ReasoningClaude Opus 4.5 wins
BenchmarkClaude Opus 4.5Gemma 4 12BResult
LongBench v2Source 64.4%—Not comparable
AI-NeedleSource 74%—Not comparable
AA-LCRSource 65.3%55.3%Claude Opus 4.5 leads
CritPtSource 0.3%0.0%Claude Opus 4.5 leads
BBHSource —53%Not comparable
MRCRv2Source —43.4%Not comparable
KnowledgeGemma 4 12B wins
BenchmarkClaude Opus 4.5Gemma 4 12BResult
GPQASource 87%78.8%Claude Opus 4.5 leads
SuperGPQASource 70.6%—Not comparable
MMLU-ProSource 89.5%77.2%Claude Opus 4.5 leads
MMLU-ReduxSource 96.6%—Not comparable
C-EvalSource 92.2%—Not comparable
HLESource 30.8%—Not comparable
Artificial Analysis Intelligence IndexSource 34.7%22.0%Claude Opus 4.5 leads
AA-GPQA DiamondSource 81.0%75.3%Claude Opus 4.5 leads
AA-HLESource 12.9%14.8%Gemma 4 12B leads
AA-Omniscience IndexSource -3.9%-51.9%Claude Opus 4.5 leads
AA-Omniscience AccuracySource 40.7%16.0%Claude Opus 4.5 leads
AA-Omniscience Hallucination RateSource 75.4%80.8%Claude Opus 4.5 leads
AA MMLU-ProSource 88.9%—Not comparable
GPQA-DSource —78.8%Not comparable
HLE w/o toolsSource —5.2%Not comparable
MMMLUSource —83.4%Not comparable
MathGemma 4 12B wins
BenchmarkClaude Opus 4.5Gemma 4 12BResult
AIME26Source 95.1%77.5%Claude Opus 4.5 leads
HMMT Feb 2025Source 92.9%—Not comparable
HMMT Nov 2025Source 93.3%—Not comparable
HMMT Feb 2026Source 85.3%—Not comparable
MMAnswerBenchSource 84.0%—Not comparable
FrontierMath v2 (Tiers 1-3)Source 20.690%—Not comparable
FrontierMath v2 (Tier 4)Source 4.167%—Not comparable
Multilingual
BenchmarkClaude Opus 4.5Gemma 4 12BResult
MMLU-ProXSource 85.7%—Not comparable
NOVA-63Source 56.7%—Not comparable
MultimodalClaude Opus 4.5 wins
BenchmarkClaude Opus 4.5Gemma 4 12BResult
MMMU-ProSource 70.6%69.1%Claude Opus 4.5 leads
MathVisionSource 74.3%79.7%Gemma 4 12B leads
CharXivSource 68.5%—Not comparable
VideoMMMUSource 84.4%—Not comparable
ScreenSpot ProSource 45.7%—Not comparable
V*Source 67.0%—Not comparable
AA-MMMU-ProSource 71.2%69.7%Claude Opus 4.5 leads
Design Arena WebsiteSource 1277—Not comparable
MedXpertQA (MM)Source —48.7%Not comparable
Inst. Following
BenchmarkClaude Opus 4.5Gemma 4 12BResult
IFEvalSource 90.9%—Not comparable
IFBenchSource 58%—Not comparable
AA-IFBenchSource 43.0%73.5%Gemma 4 12B leads
Frequently Asked Questions (5)

Which is better, Claude Opus 4.5 or Gemma 4 12B?

Claude Opus 4.5 is ahead on BenchLM's BenchAlign leaderboard, 64.22 to 47.29. The biggest single separator in this matchup is AIME26, where the scores are 95.1% and 77.5%.

Which is better for knowledge tasks, Claude Opus 4.5 or Gemma 4 12B?

Gemma 4 12B has the edge for knowledge tasks in this comparison, averaging 77.5 versus 58.1. Inside this category, AA-Omniscience Index is the benchmark that creates the most daylight between them.

Which is better for math, Claude Opus 4.5 or Gemma 4 12B?

Gemma 4 12B has the edge for math in this comparison, averaging 77.5 versus 57.5. Inside this category, AIME26 is the benchmark that creates the most daylight between them.

Which is better for reasoning, Claude Opus 4.5 or Gemma 4 12B?

Claude Opus 4.5 has the edge for reasoning in this comparison, averaging 64.4 versus 43.4. Inside this category, AA-LCR is the benchmark that creates the most daylight between them.

Which is better for multimodal and grounded tasks, Claude Opus 4.5 or Gemma 4 12B?

Claude Opus 4.5 has the edge for multimodal and grounded tasks in this comparison, averaging 69.9 versus 69.1. Inside this category, MathVision is the benchmark that creates the most daylight between them.

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