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Claude Sonnet 4.5 vs o3 Mini

Claude Sonnet 4.5 leads o3 Mini on the Artificial Analysis Intelligence Index, 20.7 to 12.5, and o3 Mini costs 3.4x less per output token ($4.40 vs $15.00 per million). Updated October 22, 2026; 56 benchmarks have a result for both.

Replace Claude Sonnet 4.5 Replace o3 Mini
Claude Sonnet 4.5Anthropic
Coding
39.5
Overall
49.5
Output $/M
$15.00
54
o3 MiniOpenAI
Coding
No data
Overall
38.0
Output $/M
$4.40
2
vs boards won of 56 shared

Claude Sonnet 4.5 or o3 Mini: which to pick

Only Claude Sonnet 4.5 has a coding score, 39.5 on the Vibe Coding Index; o3 Mini has none, so the two cannot be ranked on coding.

Pick o3 Mini for output tokens 3.4x cheaper ($4.40 vs $15.00 per million) and work measured by Chess puzzles or MedQA (Vals AI), where it leads.

Model AClaude Sonnet 4.5Anthropic39.5/1003 independent benchmarks$1.16 per solved taskModel Bo3 MiniOpenAINot benchmarkedNo coding benchmarkNo cost per solved task
Shared results
56
Claude Sonnet 4.5 only
39
o3 Mini only
15
Like-for-like categories
6 of 9

Only benchmarks that tested both models count toward a pick; a result only one model has is shown but not compared.

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 Sonnet 4.5 39.5 from 3 benchmarks, o3 Mini not benchmarked.
Widest category
General, 19.8 points apart on average over 19 shared benchmarks.
Widest single gap
Cybench: Claude Sonnet 4.5 60.0% against o3 Mini 22.5%, 37.5 points apart on a 0 to 100 scale.
Output price
Claude Sonnet 4.5 $15.00 against o3 Mini $4.40 per million output tokens, 3.4x apart.
Context window
Claude Sonnet 4.5 takes 1M tokens, o3 Mini 200K.

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 Sonnet 4.5Barso3 MiniTies
Coding70
Intelligence20
Reasoning91
Math80
Knowledge91
General190
All shared boards542
CodingLike-for-likeSix of these boards feed the Vibe Coding Index70
Coding benchmarks for Claude Sonnet 4.5 and o3 Mini
BenchmarkClaude Sonnet 4.5o3 MiniLeader
Aider polyglotNot measured60.4%Only o3 Mini measured
SWE-bench Verified74.8%42.4%Claude Sonnet 4.5
SWE-bench LiteNot measured32.3%Only o3 Mini measured
SWE-bench Multilingual67.0%Not measuredOnly Claude Sonnet 4.5 measured
LMArena WebDev1394Not measuredOnly Claude Sonnet 4.5 measured
AA Coding Index52.1Not measuredOnly Claude Sonnet 4.5 measured
LiveCodeBench (Vals AI)73.0%71.5%Claude Sonnet 4.5
SWE-bench Verified (Vals AI)70.0%Not measuredOnly Claude Sonnet 4.5 measured
Vibe Code Bench (Vals AI)22.6%Not measuredOnly Claude Sonnet 4.5 measured
LiveCodeBench (Artificial Analysis run)Not measured73.4%Only o3 Mini measured
SciCodeNot measured42.8%Only o3 Mini measured
Terminal-Bench Hard (Artificial Analysis run)Not measured6.8%Only o3 Mini measured
Terminal-Bench46.5%Not measuredOnly Claude Sonnet 4.5 measured
GSO-Bench14.7%1.3%Claude Sonnet 4.5
WeirdML47.7%43.7%Claude Sonnet 4.5
Cybench60.0%22.5%Claude Sonnet 4.5
LMArena Text: coding14881378Claude Sonnet 4.5
LMArena Text: software and IT14731364Claude Sonnet 4.5
LMArena WebDev: React1386Not measuredOnly Claude Sonnet 4.5 measured
LMArena WebDev: HTML1399Not measuredOnly Claude Sonnet 4.5 measured
SciCodeNot measured7.7%Only o3 Mini measured
Neither model has a result on the other 18 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Claude Sonnet 4.5 and o3 Mini
BenchmarkClaude Sonnet 4.5o3 MiniLeader
AA Intelligence Index20.712.5Claude Sonnet 4.5
Epoch Capabilities Index146.7140.2Claude Sonnet 4.5
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index12 boards, none shared
Agentic work benchmarks for Claude Sonnet 4.5 and o3 Mini
BenchmarkClaude Sonnet 4.5o3 MiniLeader
AA Agentic Index15.8Not measuredOnly Claude Sonnet 4.5 measured
Design Arena: agents building web apps1060Not measuredOnly Claude Sonnet 4.5 measured
Design Arena: agents building full-stack apps1050Not measuredOnly Claude Sonnet 4.5 measured
Design Arena: agents building mobile apps1137Not measuredOnly Claude Sonnet 4.5 measured
τ²-Bench TelecomNot measured31.3%Only o3 Mini measured
METR time horizons67.4%Not measuredOnly Claude Sonnet 4.5 measured
Remote Labor Index2.1%Not measuredOnly Claude Sonnet 4.5 measured
GDPval42.5%Not measuredOnly Claude Sonnet 4.5 measured
DeepResearch Bench52.6%Not measuredOnly Claude Sonnet 4.5 measured
OSWorld62.9%Not measuredOnly Claude Sonnet 4.5 measured
Vending-Bench 2$3,839Not measuredOnly Claude Sonnet 4.5 measured
Berkeley Function Calling Leaderboard (BFCL)73.2%Not measuredOnly Claude Sonnet 4.5 measured
Neither model has a result on the other 29 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index91
Reasoning benchmarks for Claude Sonnet 4.5 and o3 Mini
BenchmarkClaude Sonnet 4.5o3 MiniLeader
GPQA Diamond81.6%75.5%Claude Sonnet 4.5
MMMU Pro (Vals AI)79.3%Not measuredOnly Claude Sonnet 4.5 measured
GPQA Diamond (Artificial Analysis run)Not measured77.3%Only o3 Mini measured
Humanity's Last Exam (Artificial Analysis run)Not measured12.0%Only o3 Mini measured
GPQA Diamond (Epoch AI run)82.3%77.0%Claude Sonnet 4.5
ARC-AGI63.7%34.5%Claude Sonnet 4.5
ARC-AGI-213.6%3.0%Claude Sonnet 4.5
SimpleBench54.3%22.8%Claude Sonnet 4.5
Chess puzzles10.0%15.0%o3 Mini
Mystery game puzzles17.0%7.0%Claude Sonnet 4.5
EBR-bench2.4%Not measuredOnly Claude Sonnet 4.5 measured
VPCT39.8%Not measuredOnly Claude Sonnet 4.5 measured
LMArena Text: hard prompts14621365Claude Sonnet 4.5
LMArena Text: expert14831364Claude Sonnet 4.5
LMArena Text: hard prompts in English14711375Claude Sonnet 4.5
Kagi LLM Benchmark57.9%Not measuredOnly Claude Sonnet 4.5 measured
Neither model has a result on the other 6 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index80
Math benchmarks for Claude Sonnet 4.5 and o3 Mini
BenchmarkClaude Sonnet 4.5o3 MiniLeader
AIME88.2%86.5%Claude Sonnet 4.5
MATH 500 (Vals AI)Not measured91.8%Only o3 Mini measured
MGSM (Vals AI)94.3%91.3%Claude Sonnet 4.5
OTIS Mock AIME77.8%76.9%Claude Sonnet 4.5
FrontierMath, tiers 1 to 323.9%18.6%Claude Sonnet 4.5
FrontierMath, tier 42.4%0.0%Claude Sonnet 4.5
ProofBench19.0%Not measuredOnly Claude Sonnet 4.5 measured
MATH level 597.7%96.5%Claude Sonnet 4.5
LMArena Text: math14491396Claude Sonnet 4.5
LMArena Text: mathematical work14621399Claude Sonnet 4.5
Neither model has a result on the other 3 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index91
Knowledge benchmarks for Claude Sonnet 4.5 and o3 Mini
BenchmarkClaude Sonnet 4.5o3 MiniLeader
MMLU Pro87.4%78.7%Claude Sonnet 4.5
LegalBench (Vals AI)84.1%71.5%Claude Sonnet 4.5
CaseLaw (Vals AI)62.2%Not measuredOnly Claude Sonnet 4.5 measured
CorpFin (Vals AI)62.0%45.3%Claude Sonnet 4.5
TaxEval (Vals AI)73.3%69.4%Claude Sonnet 4.5
MortgageTax (Vals AI)64.0%Not measuredOnly Claude Sonnet 4.5 measured
MedQA (Vals AI)94.7%94.8%o3 Mini
MedCode (Vals AI)44.1%Not measuredOnly Claude Sonnet 4.5 measured
MMLU Pro (Artificial Analysis run)Not measured80.2%Only o3 Mini measured
SimpleQA Verified30.7%15.3%Claude Sonnet 4.5
LMArena Text: science14481339Claude Sonnet 4.5
LMArena Text: medicine and healthcare14441330Claude Sonnet 4.5
LMArena Text: legal and government14511328Claude Sonnet 4.5
LMArena Text: business and finance14401313Claude Sonnet 4.5
FACTS Benchmark Suite40.6%Not measuredOnly Claude Sonnet 4.5 measured
Neither model has a result on the other 3 boards here
Web designDirectional onlyPublic boards, shown as published, kept out of the index8 boards, none shared
Web design benchmarks for Claude Sonnet 4.5 and o3 Mini
BenchmarkClaude Sonnet 4.5o3 MiniLeader
Design Arena: websites1189Not measuredOnly Claude Sonnet 4.5 measured
Design Arena: UI components1170Not measuredOnly Claude Sonnet 4.5 measured
Design Arena: game dev1166Not measuredOnly Claude Sonnet 4.5 measured
Design Arena: data viz1167Not measuredOnly Claude Sonnet 4.5 measured
Design Arena: 3D1157Not measuredOnly Claude Sonnet 4.5 measured
Design Arena: all code categories1182Not measuredOnly Claude Sonnet 4.5 measured
Design Arena: SVG1115Not measuredOnly Claude Sonnet 4.5 measured
Design Arena: ASCII art1205Not measuredOnly Claude Sonnet 4.5 measured
Neither model has a result on the other 1 board here
GeneralLike-for-likePublic boards, shown as published, kept out of the index190
General benchmarks for Claude Sonnet 4.5 and o3 Mini
BenchmarkClaude Sonnet 4.5o3 MiniLeader
SAGE (Vals AI)36.1%Not measuredOnly Claude Sonnet 4.5 measured
MedScribe (Vals AI)84.5%Not measuredOnly Claude Sonnet 4.5 measured
IFBenchNot measured67.1%Only o3 Mini measured
Long context reasoning (AA-LCR)Not measured43.0%Only o3 Mini measured
DTBench83.2%68.8%Claude Sonnet 4.5
LMCA38.8%19.0%Claude Sonnet 4.5
Fiction.LiveBenchNot measured50.0%Only o3 Mini measured
Creative writing (Lech Mazur)Not measured61.7%Only o3 Mini measured
LMArena Text14381337Claude Sonnet 4.5
LMArena Text: instruction following14591337Claude Sonnet 4.5
LMArena Text: creative writing14421286Claude Sonnet 4.5
LMArena Text: English14501351Claude Sonnet 4.5
LMArena Text: non-English14251319Claude Sonnet 4.5
LMArena Text: Chinese14601379Claude Sonnet 4.5
LMArena Text: German14271303Claude Sonnet 4.5
LMArena Text: Japanese13901286Claude Sonnet 4.5
LMArena Text: Korean14021313Claude Sonnet 4.5
LMArena Text: French14591334Claude Sonnet 4.5
LMArena Text: Spanish14581321Claude Sonnet 4.5
LMArena Text: Russian14371304Claude Sonnet 4.5
LMArena Text: Polish14231294Claude Sonnet 4.5
LMArena Text: multi-turn14651320Claude Sonnet 4.5
LMArena Text: longer queries14751343Claude Sonnet 4.5
LMArena Text: writing and language14421313Claude Sonnet 4.5
LMArena Text: entertainment and media14281283Claude Sonnet 4.5
LMArena Document1450Not measuredOnly Claude Sonnet 4.5 measured
Neither model has a result on the other 20 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Claude Sonnet 4.5 and o3 Mini
BenchmarkClaude Sonnet 4.5o3 MiniLeader
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 Sonnet 4.5$0.011Fits in one request
o3 Mini$0.0033Fits in one request

o3 Mini costs less

Repository review

50K input + 3K output tokens

Claude Sonnet 4.5$0.195Fits in one request
o3 Mini$0.068Fits in one request

o3 Mini costs less

Agent loop

200K input + 10K output tokens

Claude Sonnet 4.5$0.750Fits in one request
o3 Mini$0.264Exceeds the context window

o3 Mini 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 Sonnet 4.5 and o3 Mini
SpecificationAnthropic Claude Sonnet 4.5OpenAI o3 Mini
MakerAnthropicOpenAI
WeightsNo public weights listedNo public weights listed
ReleasedSeptember 29, 2025January 31, 2025
Context window1M200K
Input $/Mtok$3.00$1.10
Output $/Mtok$15.00$4.40
Coding index39.5Not benchmarked
Independent measurements behind it30
Cost per solved task$1.16Not computable
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Sonnet 4.5 better than o3 Mini for coding?

Only Claude Sonnet 4.5 has a coding score, 39.5 on the Vibe Coding Index; o3 Mini has none, so the two cannot be ranked on coding. Pick o3 Mini for output tokens 3.4x cheaper ($4.40 vs $15.00 per million) and work measured by Chess puzzles or MedQA (Vals AI), where it leads.

Which is cheaper, Claude Sonnet 4.5 or o3 Mini?

Claude Sonnet 4.5 costs $3.00 per million input tokens and $15.00 per million output tokens; o3 Mini costs $1.10 and $4.40. Cost per solved task is known for Claude Sonnet 4.5 only.

Which has the bigger context window, Claude Sonnet 4.5 or o3 Mini?

Claude Sonnet 4.5, with 1M tokens against 200K.

How many benchmarks is the Claude Sonnet 4.5 vs o3 Mini comparison based on?

56 benchmarks have a result for both models as of October 22, 2026. Claude Sonnet 4.5's coding index rests on 3 independent benchmarks and o3 Mini's on 0. Where only one model has a result, the page says so instead of naming a winner.

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