Claude Opus 4.5 vs Gemma 4 31B

Updated October 21, 2026. 46 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.

Replace Claude Opus 4.5 Replace Gemma 4 31B

Claude Opus 4.5Anthropic

Coding: 66.8
Overall: 29.1
Output $/M: $25.00

Gemma 4 31BGoogle

Coding: 38.3
Overall: 14.7
Output $/M: $0.40

vs boards won of 46 shared

Decision reading

Pick Claude Opus 4.5 for coding: it scores 66.8 on the Vibe Coding Index against 38.3 for Gemma 4 31B.

Pick Gemma 4 31B when output tokens cost 62.5x less, or when the context window is larger, 262K against 200K tokens.

Model AClaude Opus 4.5Anthropic66.8/1002 independent benchmarks$1.37 per solved task Model BGemma 4 31BGoogle38.3/1002 independent benchmarksNo cost per solved task

465922

Shared results: 46
Claude Opus 4.5 only: 59
Gemma 4 31B only: 22
Like-for-like categories: 7 of 9

Shared results can support a head-to-head reading. Results only one model has describe coverage, not superiority.

Which one for your work

Each card is decided by one number both models carry. Where only one has it, the card says so and makes no call.

Coding
Vibe Coding Index, four public coding benchmarks
Claude Opus 4.5
Claude Opus 4.5 scores 66.8 against 38.3.
2 benchmarks behind each score
Intelligence
AA Intelligence Index
Claude Opus 4.5
Claude Opus 4.5 leads, 29.1 against 14.7.
Same board, both measured
Agentic work
AA Agentic Index
No call
Only Gemma 4 31B has a AA Agentic Index result, 4.2.
Directional only
Reasoning
GPQA Diamond
No call
Only Claude Opus 4.5 has a GPQA Diamond result, 85.9%.
Directional only
Math
AIME
No call
Only Claude Opus 4.5 has a AIME result, 95.4%.
Directional only
Knowledge
MMLU Pro
No call
Only Claude Opus 4.5 has a MMLU Pro result, 87.3%.
Directional only
Web design
Design Arena: websites
No call
Only Claude Opus 4.5 has a Design Arena: websites result, 1247.
Directional only
Long documents
Listed context window
Gemma 4 31B
Gemma 4 31B takes 262K tokens against 200K.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Gemma 4 31B
Claude Opus 4.5 $0.018, Gemma 4 31B $0.0004 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
No call
Only Claude Opus 4.5 has the number, $1.37.
Directional only

At a glance

Coding index: Claude Opus 4.5 66.8 from 2 benchmarks, Gemma 4 31B 38.3 from 2 benchmarks.
Widest category: Agentic work, 24.0 points apart on average over 1 shared benchmark.
Widest single gap: SimpleQA Verified: Claude Opus 4.5 45.7% against Gemma 4 31B 10.4%, 35.3 points apart on a 0 to 100 scale.
Output price: Claude Opus 4.5 $25.00 against Gemma 4 31B $0.40 per million output tokens, 62.5x apart.
Context window: Claude Opus 4.5 takes 200K tokens, Gemma 4 31B 262K.

Benchmark by benchmark

First the score: boards each model leads, per category, where both have a result. Then every board, a category to a fold; bars are each result on a 0 to 100 scale, so compare the two in a row, not one row with another.

Boards won, where both have a result
Category	Claude Opus 4.5	Gemma 4 31B
Coding	7	0
Intelligence	2	0
Agentic work	1	0
Reasoning	6	0
Math	3	0
Knowledge	5	2
General	16	4
All shared boards	40	6

CodingLike-for-likeFour of these boards feed the Vibe Coding Index70

Coding benchmarks for Claude Opus 4.5 and Gemma 4 31B
Benchmark	Claude Opus 4.5	Gemma 4 31B	Leader
SWE-bench Verified	79.2%	Not measured	Only Claude Opus 4.5 measured
SWE-bench (full test set)	52.6%	Not measured	Only Claude Opus 4.5 measured
SWE-bench Multilingual	70.7%	Not measured	Only Claude Opus 4.5 measured
LiveBench coding	Not measured	49.0%	Only Gemma 4 31B measured
LMArena WebDev	1494	1367	Claude Opus 4.5
AA Coding Index	Not measured	43.4	Only Gemma 4 31B measured
LiveCodeBench (Vals AI)	83.7%	Not measured	Only Claude Opus 4.5 measured
SWE-bench Verified (Vals AI)	76.4%	Not measured	Only Claude Opus 4.5 measured
Vibe Code Bench (Vals AI)	20.6%	Not measured	Only Claude Opus 4.5 measured
LiveCodeBench (Artificial Analysis run)	87.1%	Not measured	Only Claude Opus 4.5 measured
SciCode	Not measured	45.5%	Only Gemma 4 31B measured
Terminal-Bench Hard (Artificial Analysis run)	47.0%	36.4%	Claude Opus 4.5
Terminal-Bench	63.1%	Not measured	Only Claude Opus 4.5 measured
GSO-Bench	26.5%	Not measured	Only Claude Opus 4.5 measured
WeirdML	63.7%	52.3%	Claude Opus 4.5
Cybench	82.0%	Not measured	Only Claude Opus 4.5 measured
ALE-Bench	Not measured	925.5	Only Gemma 4 31B measured
LMArena Text: coding	1503	1459	Claude Opus 4.5
LMArena Text: software and IT	1483	1463	Claude Opus 4.5
LMArena WebDev: React	1478	1359	Claude Opus 4.5
LMArena WebDev: HTML	1510	1380	Claude Opus 4.5
Neither model has a result on the other 17 boards here

IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20

Intelligence benchmarks for Claude Opus 4.5 and Gemma 4 31B
Benchmark	Claude Opus 4.5	Gemma 4 31B	Leader
AA Intelligence Index	29.1	14.7	Claude Opus 4.5
Epoch Capabilities Index	150.1	143.0	Claude Opus 4.5

Agentic workLike-for-likePublic boards, shown as published, kept out of the index10

Agentic work benchmarks for Claude Opus 4.5 and Gemma 4 31B
Benchmark	Claude Opus 4.5	Gemma 4 31B	Leader
AA Agentic Index	Not measured	4.2	Only Gemma 4 31B measured
Design Arena: agents building web apps	1159	Not measured	Only Claude Opus 4.5 measured
Design Arena: agents building full-stack apps	1156	Not measured	Only Claude Opus 4.5 measured
Design Arena: agents building mobile apps	1189	Not measured	Only Claude Opus 4.5 measured
Design Arena: agents building Android apps	1181	Not measured	Only Claude Opus 4.5 measured
LiveBench research	Not measured	44.4%	Only Gemma 4 31B measured
LiveBench browser	Not measured	4.0%	Only Gemma 4 31B measured
LiveBench long agentic	Not measured	13.3%	Only Gemma 4 31B measured
τ²-Bench Telecom	89.5%	65.5%	Claude Opus 4.5
METR time horizons	75.0%	Not measured	Only Claude Opus 4.5 measured
Remote Labor Index	3.8%	Not measured	Only Claude Opus 4.5 measured
GDPval	45.5%	Not measured	Only Claude Opus 4.5 measured
BALROG	43.5%	Not measured	Only Claude Opus 4.5 measured
DeepResearch Bench	54.8%	Not measured	Only Claude Opus 4.5 measured
OSWorld	66.3%	Not measured	Only Claude Opus 4.5 measured
Vending-Bench 2	$4,967	Not measured	Only Claude Opus 4.5 measured
Neither model has a result on the other 23 boards here

ReasoningLike-for-likePublic boards, shown as published, kept out of the index60

Reasoning benchmarks for Claude Opus 4.5 and Gemma 4 31B
Benchmark	Claude Opus 4.5	Gemma 4 31B	Leader
GPQA Diamond	85.9%	Not measured	Only Claude Opus 4.5 measured
LiveBench reasoning	Not measured	68.3%	Only Gemma 4 31B measured
MMMU Pro (Vals AI)	83.0%	Not measured	Only Claude Opus 4.5 measured
GPQA Diamond (Artificial Analysis run)	86.6%	85.7%	Claude Opus 4.5
Humanity's Last Exam (Artificial Analysis run)	30.1%	23.6%	Claude Opus 4.5
GPQA Diamond (Epoch AI run)	86.0%	75.8%	Claude Opus 4.5
ARC-AGI	80.0%	Not measured	Only Claude Opus 4.5 measured
ARC-AGI-2	37.6%	Not measured	Only Claude Opus 4.5 measured
SimpleBench	62.0%	Not measured	Only Claude Opus 4.5 measured
Chess puzzles	14.0%	Not measured	Only Claude Opus 4.5 measured
Mystery game puzzles	22.0%	Not measured	Only Claude Opus 4.5 measured
EBR-bench	14.3%	Not measured	Only Claude Opus 4.5 measured
VPCT	40.0%	Not measured	Only Claude Opus 4.5 measured
LMArena Text: hard prompts	1476	1448	Claude Opus 4.5
LMArena Text: expert	1487	1464	Claude Opus 4.5
LMArena Text: hard prompts in English	1482	1456	Claude Opus 4.5
LMArena Vision: diagrams	Not measured	1283	Only Gemma 4 31B measured
LMArena Vision: homework	Not measured	1310	Only Gemma 4 31B measured
Neither model has a result on the other 3 boards here

MathLike-for-likePublic boards, shown as published, kept out of the index30

Math benchmarks for Claude Opus 4.5 and Gemma 4 31B
Benchmark	Claude Opus 4.5	Gemma 4 31B	Leader
AIME	95.4%	Not measured	Only Claude Opus 4.5 measured
MGSM (Vals AI)	95.2%	Not measured	Only Claude Opus 4.5 measured
AA Math Index	91.3	Not measured	Only Claude Opus 4.5 measured
AIME 2025 (Artificial Analysis run)	91.3%	Not measured	Only Claude Opus 4.5 measured
OTIS Mock AIME	86.1%	73.3%	Claude Opus 4.5
FrontierMath, tiers 1 to 3	34.4%	Not measured	Only Claude Opus 4.5 measured
FrontierMath, tier 4	4.9%	Not measured	Only Claude Opus 4.5 measured
ProofBench	36.0%	Not measured	Only Claude Opus 4.5 measured
LMArena Text: math	1463	1463	Claude Opus 4.5
LMArena Text: mathematical work	1468	1465	Claude Opus 4.5
Neither model has a result on the other 3 boards here

KnowledgeLike-for-likePublic boards, shown as published, kept out of the index52

Knowledge benchmarks for Claude Opus 4.5 and Gemma 4 31B
Benchmark	Claude Opus 4.5	Gemma 4 31B	Leader
MMLU Pro	87.3%	Not measured	Only Claude Opus 4.5 measured
LegalBench (Vals AI)	84.6%	Not measured	Only Claude Opus 4.5 measured
CaseLaw (Vals AI)	62.6%	52.6%	Claude Opus 4.5
CorpFin (Vals AI)	65.1%	Not measured	Only Claude Opus 4.5 measured
TaxEval (Vals AI)	74.9%	Not measured	Only Claude Opus 4.5 measured
MortgageTax (Vals AI)	68.7%	61.4%	Claude Opus 4.5
MedQA (Vals AI)	95.9%	Not measured	Only Claude Opus 4.5 measured
MedCode (Vals AI)	49.2%	Not measured	Only Claude Opus 4.5 measured
MMLU Pro (Artificial Analysis run)	89.5%	Not measured	Only Claude Opus 4.5 measured
SimpleQA Verified	45.7%	10.4%	Claude Opus 4.5
GeoBench	75.0%	Not measured	Only Claude Opus 4.5 measured
LMArena Text: science	1454	1457	Gemma 4 31B
LMArena Text: medicine and healthcare	1444	1451	Gemma 4 31B
LMArena Text: legal and government	1459	1438	Claude Opus 4.5
LMArena Text: business and finance	1448	1430	Claude Opus 4.5
Neither model has a result on the other 2 boards here

Web designDirectional onlyPublic boards, shown as published, kept out of the index9 boards, none shared

Web design benchmarks for Claude Opus 4.5 and Gemma 4 31B
Benchmark	Claude Opus 4.5	Gemma 4 31B	Leader
Design Arena: websites	1247	Not measured	Only Claude Opus 4.5 measured
Design Arena: UI components	1238	Not measured	Only Claude Opus 4.5 measured
Design Arena: game dev	1229	Not measured	Only Claude Opus 4.5 measured
Design Arena: data viz	1243	Not measured	Only Claude Opus 4.5 measured
Design Arena: 3D	1214	Not measured	Only Claude Opus 4.5 measured
Design Arena: all code categories	1242	Not measured	Only Claude Opus 4.5 measured
Design Arena: SVG	1180	Not measured	Only Claude Opus 4.5 measured
Design Arena: ASCII art	1190	Not measured	Only Claude Opus 4.5 measured
LiveBench design	Not measured	58.4%	Only Gemma 4 31B measured

GeneralLike-for-likePublic boards, shown as published, kept out of the index164

General benchmarks for Claude Opus 4.5 and Gemma 4 31B
Benchmark	Claude Opus 4.5	Gemma 4 31B	Leader
LiveBench data analysis	Not measured	53.3%	Only Gemma 4 31B measured
SAGE (Vals AI)	52.1%	55.0%	Gemma 4 31B
MedScribe (Vals AI)	85.3%	Not measured	Only Claude Opus 4.5 measured
IFBench	58.0%	75.6%	Gemma 4 31B
Long context reasoning (AA-LCR)	77.3%	69.7%	Claude Opus 4.5
DTBench	89.9%	82.7%	Claude Opus 4.5
LMCA	44.5%	39.3%	Claude Opus 4.5
CL-bench	21.1%	Not measured	Only Claude Opus 4.5 measured
Surface Evolver Bench	Not measured	30.6%	Only Gemma 4 31B measured
Furniture assembly	28.3%	Not measured	Only Claude Opus 4.5 measured
LMArena Text	1451	1443	Claude Opus 4.5
LMArena Text: instruction following	1478	1433	Claude Opus 4.5
LMArena Text: creative writing	1445	1417	Claude Opus 4.5
LMArena Vision	Not measured	1276	Only Gemma 4 31B measured
LMArena Text: English	1461	1451	Claude Opus 4.5
LMArena Text: non-English	1438	1430	Claude Opus 4.5
LMArena Text: Chinese	1470	1475	Gemma 4 31B
LMArena Text: German	1449	Not measured	Only Claude Opus 4.5 measured
LMArena Text: Japanese	1417	Not measured	Only Claude Opus 4.5 measured
LMArena Text: Korean	1424	Not measured	Only Claude Opus 4.5 measured
LMArena Text: French	1471	1436	Claude Opus 4.5
LMArena Text: Spanish	1457	1442	Claude Opus 4.5
LMArena Text: Russian	1447	1460	Gemma 4 31B
LMArena Text: Polish	1439	1433	Claude Opus 4.5
LMArena Text: multi-turn	1466	1452	Claude Opus 4.5
LMArena Text: longer queries	1479	1446	Claude Opus 4.5
LMArena Text: writing and language	1452	1432	Claude Opus 4.5
LMArena Text: entertainment and media	1434	1405	Claude Opus 4.5
LMArena Vision: English	Not measured	1271	Only Gemma 4 31B measured
LMArena Vision: Chinese	Not measured	1326	Only Gemma 4 31B measured
LMArena Vision: reading text	Not measured	1282	Only Gemma 4 31B measured
LMArena Vision: humor	Not measured	1280	Only Gemma 4 31B measured
LMArena Vision: captioning	Not measured	1218	Only Gemma 4 31B measured
LMArena Vision: recognizing things	Not measured	1226	Only Gemma 4 31B measured
LMArena Vision: creative writing	Not measured	1285	Only Gemma 4 31B measured
LMArena Document	1462	1425	Claude Opus 4.5
Neither model has a result on the other 10 boards here

Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared

Image generation benchmarks for Claude Opus 4.5 and Gemma 4 31B
Benchmark	Claude Opus 4.5	Gemma 4 31B	Leader
Neither model has a result on 5 boards here

What each workload costs

Three fixed token mixes at each model's listed price, so per-token rates become a bill.

Chat turn

1K input + 500 output tokens

Claude Opus 4.5$0.018Fits in one request

Gemma 4 31B$0.0004Fits in one request

Gemma 4 31B costs less

Repository review

50K input + 3K output tokens

Claude Opus 4.5$0.325Fits in one request

Gemma 4 31B$0.011Fits in one request

Gemma 4 31B costs less

Agent loop

200K input + 10K output tokens

Claude Opus 4.5$1.25Exceeds the context window

Gemma 4 31B$0.044Fits in one request

Gemma 4 31B costs less

Listed OpenRouter rates, without cache or batch discounts. A workload that does not fit a model's context window would need splitting.

Specification differences

The leading value in a row is marked; a row with a missing value names no leader. Our two rows are marked in red.

Specifications of Claude Opus 4.5 and Gemma 4 31B
Specification	Anthropic Claude Opus 4.5	Google Gemma 4 31B
Maker	Anthropic	Google
Weights	No public weights listed	Open weights
Released	November 24, 2025	April 2, 2026
Context window	200K	262K
Input $/Mtok	$5.00	$0.20
Output $/Mtok	$25.00	$0.40
Coding index	66.8	38.3
Independent measurements behind it	2	2
Cost per solved task	$1.37	Not computable
Source	OpenRouter listing	OpenRouter listing

Questions

Is Claude Opus 4.5 better than Gemma 4 31B for coding?

Pick Claude Opus 4.5 for coding: it scores 66.8 on the Vibe Coding Index against 38.3 for Gemma 4 31B. Pick Gemma 4 31B when output tokens cost 62.5x less, or when the context window is larger, 262K against 200K tokens.

Which is cheaper, Claude Opus 4.5 or Gemma 4 31B?

Claude Opus 4.5 costs $5.00 per million input tokens and $25.00 per million output tokens; Gemma 4 31B costs $0.20 and $0.40. Cost per solved task is known for Claude Opus 4.5 only.

Which has the bigger context window, Claude Opus 4.5 or Gemma 4 31B?

Gemma 4 31B, with 262K tokens against 200K.

How many benchmarks is the Claude Opus 4.5 vs Gemma 4 31B comparison based on?

46 benchmarks have a result for both models as of October 21, 2026. Claude Opus 4.5's coding index rests on 2 independent benchmarks and Gemma 4 31B's on 2. Where only one model has a result, the page says so instead of naming a winner.

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Decision reading

Which one for your work

Coding

Intelligence

Agentic work

Reasoning

Math

Knowledge

Web design

Long documents

Everyday cost

Cost per solved task

At a glance

Benchmark by benchmark

What each workload costs

Chat turn

Repository review

Agent loop

Specification differences

Questions

Compare next