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Claude Opus 4.8 vs Claude Sonnet 4.5

Updated October 21, 2026. 79 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.

Replace Claude Opus 4.8 Replace Claude Sonnet 4.5
Claude Opus 4.8Anthropic
Coding
66.0
Overall
41.8
Output $/M
$25.00
77
Claude Sonnet 4.5Anthropic
Coding
59.1
Overall
20.7
Output $/M
$15.00
2
vs boards won of 79 shared

Decision reading

Pick Claude Opus 4.8 for coding: it scores 66.0 on the Vibe Coding Index against 59.1 for Claude Sonnet 4.5.

Pick Claude Sonnet 4.5 when output tokens cost 1.7x less, or when a solved task costs $1.16 against $2.17.

Model AClaude Opus 4.8Anthropic66.0/1002 independent benchmarks$2.17 per solved taskModel BClaude Sonnet 4.5Anthropic59.1/1002 independent benchmarks$1.16 per solved task
Shared results
79
Claude Opus 4.8 only
47
Claude Sonnet 4.5 only
13
Like-for-like categories
8 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.

At a glance

Coding index
Claude Opus 4.8 66.0 from 2 benchmarks, Claude Sonnet 4.5 59.1 from 2 benchmarks.
Widest category
Math, 32.1 points apart on average over 6 shared benchmarks.
Widest single gap
Vibe Code Bench (Vals AI): Claude Opus 4.8 82.7% against Claude Sonnet 4.5 22.6%, 60.1 points apart on a 0 to 100 scale.
Output price
Claude Opus 4.8 $25.00 against Claude Sonnet 4.5 $15.00 per million output tokens, 1.7x apart.
Context window
Both take 1M tokens.

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
CategoryClaude Opus 4.8BarsClaude Sonnet 4.5Ties
Coding110
Intelligence20
Agentic work61
Reasoning120
Math60
Knowledge101
Web design80
General220
All shared boards772
CodingLike-for-likeFour of these boards feed the Vibe Coding Index110
Coding benchmarks for Claude Opus 4.8 and Claude Sonnet 4.5
BenchmarkClaude Opus 4.8Claude Sonnet 4.5Leader
SWE-bench VerifiedNot measured74.8%Only Claude Sonnet 4.5 measured
SWE-bench MultilingualNot measured67.0%Only Claude Sonnet 4.5 measured
LiveBench coding77.3%Not measuredOnly Claude Opus 4.8 measured
LMArena WebDev15561394Claude Opus 4.8
AA Coding Index74.352.1Claude Opus 4.8
LiveCodeBench (Vals AI)87.8%73.0%Claude Opus 4.8
SWE-bench Verified (Vals AI)88.6%70.0%Claude Opus 4.8
Terminal-Bench 4 (Vals AI)23.2%Not measuredOnly Claude Opus 4.8 measured
Vibe Code Bench (Vals AI)82.7%22.6%Claude Opus 4.8
Code migration (Vals AI)47.3%Not measuredOnly Claude Opus 4.8 measured
ProgramBench (Vals AI)1.0%Not measuredOnly Claude Opus 4.8 measured
Terminal-Bench 2.1 (Vals AI)71.9%Not measuredOnly Claude Opus 4.8 measured
SkillsBench (Vals AI)59.2%Not measuredOnly Claude Opus 4.8 measured
SciCode54.4%Not measuredOnly Claude Opus 4.8 measured
Terminal-Bench Hard (Artificial Analysis run)58.3%Not measuredOnly Claude Opus 4.8 measured
Terminal-BenchNot measured46.5%Only Claude Sonnet 4.5 measured
FrontierCode46.5%Not measuredOnly Claude Opus 4.8 measured
GSO-Bench47.1%14.7%Claude Opus 4.8
WeirdML82.9%47.7%Claude Opus 4.8
CybenchNot measured60.0%Only Claude Sonnet 4.5 measured
LMArena Text: coding14901488Claude Opus 4.8
LMArena Text: software and IT14881473Claude Opus 4.8
LMArena WebDev: React15571386Claude Opus 4.8
LMArena WebDev: HTML15431399Claude Opus 4.8
Neither model has a result on the other 14 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Claude Opus 4.8 and Claude Sonnet 4.5
BenchmarkClaude Opus 4.8Claude Sonnet 4.5Leader
AA Intelligence Index41.820.7Claude Opus 4.8
Epoch Capabilities Index159.0146.7Claude Opus 4.8
Agentic workLike-for-likePublic boards, shown as published, kept out of the index61
Agentic work benchmarks for Claude Opus 4.8 and Claude Sonnet 4.5
BenchmarkClaude Opus 4.8Claude Sonnet 4.5Leader
AA Agentic Index41.915.8Claude Opus 4.8
Design Arena: agents building web apps12331060Claude Opus 4.8
Design Arena: agents building full-stack apps12491050Claude Opus 4.8
Design Arena: agents building mobile apps12221137Claude Opus 4.8
Design Arena: agents building Android apps1237Not measuredOnly Claude Opus 4.8 measured
Design Arena: agents building Godot games1231Not measuredOnly Claude Opus 4.8 measured
Design Arena: agents building games1238Not measuredOnly Claude Opus 4.8 measured
Design Arena: HTML slides1221Not measuredOnly Claude Opus 4.8 measured
Design Arena: PowerPoint slides1227Not measuredOnly Claude Opus 4.8 measured
LiveBench research81.8%Not measuredOnly Claude Opus 4.8 measured
LiveBench browser96.0%Not measuredOnly Claude Opus 4.8 measured
LiveBench long agentic48.3%Not measuredOnly Claude Opus 4.8 measured
Finance Agent (Vals AI)53.9%Not measuredOnly Claude Opus 4.8 measured
Tax Agent Bench (Vals AI)30.0%Not measuredOnly Claude Opus 4.8 measured
Legal Research Bench (Vals AI)43.8%Not measuredOnly Claude Opus 4.8 measured
Excel Modeling Benchmark (Vals AI)69.4%Not measuredOnly Claude Opus 4.8 measured
Terminal-Bench-Science (Vals AI)4.3%Not measuredOnly Claude Opus 4.8 measured
Time Horizon Index (Vals AI)11.8%Not measuredOnly Claude Opus 4.8 measured
τ²-Bench Telecom94.4%Not measuredOnly Claude Opus 4.8 measured
APEX-Agents48.9%Not measuredOnly Claude Opus 4.8 measured
METR time horizonsNot measured67.4%Only Claude Sonnet 4.5 measured
Remote Labor Index8.3%2.1%Claude Opus 4.8
GDPvalNot measured42.5%Only Claude Sonnet 4.5 measured
OSWorld 2.020.6%Not measuredOnly Claude Opus 4.8 measured
DeepResearch Bench50.2%52.6%Claude Sonnet 4.5
PostTrainBench33.8%Not measuredOnly Claude Opus 4.8 measured
OSWorldNot measured62.9%Only Claude Sonnet 4.5 measured
Vending-Bench 2$5,787$3,839Claude Opus 4.8
LMArena Search1204Not measuredOnly Claude Opus 4.8 measured
Neither model has a result on the other 10 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index120
Reasoning benchmarks for Claude Opus 4.8 and Claude Sonnet 4.5
BenchmarkClaude Opus 4.8Claude Sonnet 4.5Leader
GPQA Diamond92.4%81.6%Claude Opus 4.8
LiveBench reasoning89.2%Not measuredOnly Claude Opus 4.8 measured
MMMU Pro (Vals AI)86.6%79.3%Claude Opus 4.8
GPQA Diamond (Artificial Analysis run)92.0%Not measuredOnly Claude Opus 4.8 measured
Humanity's Last Exam (Artificial Analysis run)48.7%Not measuredOnly Claude Opus 4.8 measured
GPQA Diamond (Epoch AI run)91.0%82.3%Claude Opus 4.8
ARC-AGI92.5%63.7%Claude Opus 4.8
ARC-AGI-272.1%13.6%Claude Opus 4.8
SimpleBench64.8%54.3%Claude Opus 4.8
Chess puzzles52.0%10.0%Claude Opus 4.8
Mystery game puzzles36.0%17.0%Claude Opus 4.8
EBR-bench28.6%2.4%Claude Opus 4.8
VPCTNot measured39.8%Only Claude Sonnet 4.5 measured
LMArena Text: hard prompts14821462Claude Opus 4.8
LMArena Text: expert15031483Claude Opus 4.8
LMArena Text: hard prompts in English14871471Claude Opus 4.8
LMArena Vision: diagrams1315Not measuredOnly Claude Opus 4.8 measured
LMArena Vision: homework1337Not measuredOnly Claude Opus 4.8 measured
Neither model has a result on the other 3 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index60
Math benchmarks for Claude Opus 4.8 and Claude Sonnet 4.5
BenchmarkClaude Opus 4.8Claude Sonnet 4.5Leader
AIMENot measured88.2%Only Claude Sonnet 4.5 measured
MGSM (Vals AI)Not measured94.3%Only Claude Sonnet 4.5 measured
OTIS Mock AIME98.3%77.8%Claude Opus 4.8
FrontierMath, tiers 1 to 380.0%23.9%Claude Opus 4.8
FrontierMath, tier 456.1%2.4%Claude Opus 4.8
ProofBench69.0%19.0%Claude Opus 4.8
MATH level 5Not measured97.7%Only Claude Sonnet 4.5 measured
LMArena Text: math14861449Claude Opus 4.8
LMArena Text: mathematical work14971462Claude Opus 4.8
Neither model has a result on the other 4 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index101
Knowledge benchmarks for Claude Opus 4.8 and Claude Sonnet 4.5
BenchmarkClaude Opus 4.8Claude Sonnet 4.5Leader
MMLU Pro89.6%87.4%Claude Opus 4.8
LegalBench (Vals AI)83.6%84.1%Claude Sonnet 4.5
CaseLaw (Vals AI)Not measured62.2%Only Claude Sonnet 4.5 measured
CorpFin (Vals AI)66.7%62.0%Claude Opus 4.8
TaxEval (Vals AI)75.6%73.3%Claude Opus 4.8
MortgageTax (Vals AI)69.9%64.0%Claude Opus 4.8
MedQA (Vals AI)Not measured94.7%Only Claude Sonnet 4.5 measured
MedCode (Vals AI)53.2%44.1%Claude Opus 4.8
SimpleQA Verified53.0%30.7%Claude Opus 4.8
LMArena Text: science14771448Claude Opus 4.8
LMArena Text: medicine and healthcare14641444Claude Opus 4.8
LMArena Text: legal and government14771451Claude Opus 4.8
LMArena Text: business and finance14581440Claude Opus 4.8
Neither model has a result on the other 4 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index80
Web design benchmarks for Claude Opus 4.8 and Claude Sonnet 4.5
BenchmarkClaude Opus 4.8Claude Sonnet 4.5Leader
Design Arena: websites12581190Claude Opus 4.8
Design Arena: UI components12561173Claude Opus 4.8
Design Arena: game dev12641166Claude Opus 4.8
Design Arena: data viz12401167Claude Opus 4.8
Design Arena: 3D12231158Claude Opus 4.8
Design Arena: all code categories12551183Claude Opus 4.8
Design Arena: SVG11941114Claude Opus 4.8
Design Arena: ASCII art12761204Claude Opus 4.8
LiveBench design78.8%Not measuredOnly Claude Opus 4.8 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index220
General benchmarks for Claude Opus 4.8 and Claude Sonnet 4.5
BenchmarkClaude Opus 4.8Claude Sonnet 4.5Leader
LiveBench data analysis66.0%Not measuredOnly Claude Opus 4.8 measured
Public Benefits Bench (Vals AI)68.1%Not measuredOnly Claude Opus 4.8 measured
SAGE (Vals AI)54.8%36.1%Claude Opus 4.8
MedScribe (Vals AI)85.8%84.5%Claude Opus 4.8
Vals Multimodal Index70.9%Not measuredOnly Claude Opus 4.8 measured
IFBench62.2%Not measuredOnly Claude Opus 4.8 measured
Long context reasoning (AA-LCR)77.7%Not measuredOnly Claude Opus 4.8 measured
DTBench94.9%83.2%Claude Opus 4.8
LMCA57.5%38.8%Claude Opus 4.8
Surface Evolver Bench87.5%Not measuredOnly Claude Opus 4.8 measured
Furniture assembly42.5%Not measuredOnly Claude Opus 4.8 measured
LMArena Text14611438Claude Opus 4.8
LMArena Text: instruction following14761459Claude Opus 4.8
LMArena Text: creative writing14541442Claude Opus 4.8
LMArena Vision1294Not measuredOnly Claude Opus 4.8 measured
LMArena Text: English14681450Claude Opus 4.8
LMArena Text: non-English14501425Claude Opus 4.8
LMArena Text: Chinese15061460Claude Opus 4.8
LMArena Text: German14721427Claude Opus 4.8
LMArena Text: Japanese14421390Claude Opus 4.8
LMArena Text: Korean14311402Claude Opus 4.8
LMArena Text: French14811459Claude Opus 4.8
LMArena Text: Spanish14651458Claude Opus 4.8
LMArena Text: Russian14741437Claude Opus 4.8
LMArena Text: Polish14591423Claude Opus 4.8
LMArena Text: multi-turn14761465Claude Opus 4.8
LMArena Text: longer queries14831475Claude Opus 4.8
LMArena Text: writing and language14611442Claude Opus 4.8
LMArena Text: entertainment and media14401428Claude Opus 4.8
LMArena Vision: English1293Not measuredOnly Claude Opus 4.8 measured
LMArena Vision: Chinese1346Not measuredOnly Claude Opus 4.8 measured
LMArena Vision: reading text1303Not measuredOnly Claude Opus 4.8 measured
LMArena Vision: humor1282Not measuredOnly Claude Opus 4.8 measured
LMArena Vision: creative writing1301Not measuredOnly Claude Opus 4.8 measured
LMArena Document14751450Claude Opus 4.8
Neither model has a result on the other 11 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Claude Opus 4.8 and Claude Sonnet 4.5
BenchmarkClaude Opus 4.8Claude Sonnet 4.5Leader
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 4.8$0.018Fits in one request
Claude Sonnet 4.5$0.011Fits in one request

Claude Sonnet 4.5 costs less

Repository review

50K input + 3K output tokens

Claude Opus 4.8$0.325Fits in one request
Claude Sonnet 4.5$0.195Fits in one request

Claude Sonnet 4.5 costs less

Agent loop

200K input + 10K output tokens

Claude Opus 4.8$1.25Fits in one request
Claude Sonnet 4.5$0.750Fits in one request

Claude Sonnet 4.5 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 4.8 and Claude Sonnet 4.5
SpecificationAnthropic Claude Opus 4.8Anthropic Claude Sonnet 4.5
MakerAnthropicAnthropic
WeightsNo public weights listedNo public weights listed
ReleasedMay 27, 2026September 29, 2025
Context window1M1M
Input $/Mtok$5.00$3.00
Output $/Mtok$25.00$15.00
Coding index66.059.1
Independent measurements behind it22
Cost per solved task$2.17$1.16
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Opus 4.8 better than Claude Sonnet 4.5 for coding?

Pick Claude Opus 4.8 for coding: it scores 66.0 on the Vibe Coding Index against 59.1 for Claude Sonnet 4.5. Pick Claude Sonnet 4.5 when output tokens cost 1.7x less, or when a solved task costs $1.16 against $2.17.

Which is cheaper, Claude Opus 4.8 or Claude Sonnet 4.5?

Claude Opus 4.8 costs $5.00 per million input tokens and $25.00 per million output tokens; Claude Sonnet 4.5 costs $3.00 and $15.00. Per solved SWE-bench Verified task, Claude Opus 4.8 costs $2.17 and Claude Sonnet 4.5 $1.16.

Which has the bigger context window, Claude Opus 4.8 or Claude Sonnet 4.5?

Neither: both take 1M tokens.

How many benchmarks is the Claude Opus 4.8 vs Claude Sonnet 4.5 comparison based on?

79 benchmarks have a result for both models as of October 21, 2026. Claude Opus 4.8's coding index rests on 2 independent benchmarks and Claude Sonnet 4.5's on 2. Where only one model has a result, the page says so instead of naming a winner.

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