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Claude Sonnet 4.5 vs GPT-4o (2024-08-06)

Claude Sonnet 4.5 leads GPT-4o (2024-08-06) on the Artificial Analysis Intelligence Index, 20.7 to 7.7, and GPT-4o (2024-08-06) costs 1.5x less per output token ($10.00 vs $15.00 per million). Updated October 22, 2026; 44 benchmarks have a result for both.

Replace Claude Sonnet 4.5 Replace GPT-4o (2024-08-06)
Claude Sonnet 4.5Anthropic
Coding
39.5
Overall
49.5
Output $/M
$15.00
44
GPT-4o (2024-08-06)OpenAI
Coding
No data
Overall
26.3
Output $/M
$10.00
0
vs boards won of 44 shared

Claude Sonnet 4.5 or GPT-4o (2024-08-06): which to pick

Only Claude Sonnet 4.5 has a coding score, 39.5 on the Vibe Coding Index; GPT-4o (2024-08-06) has none, so the two cannot be ranked on coding.

Pick GPT-4o (2024-08-06) for output tokens 1.5x cheaper ($10.00 vs $15.00 per million).

Model AClaude Sonnet 4.5Anthropic39.5/1003 independent benchmarks$1.16 per solved taskModel BGPT-4o (2024-08-06)OpenAINot benchmarkedNo coding benchmarkNo cost per solved task
Shared results
44
Claude Sonnet 4.5 only
56
GPT-4o (2024-08-06) only
14
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, GPT-4o (2024-08-06) not benchmarked.
Widest category
Math, 39.2 points apart on average over 7 shared benchmarks.
Widest single gap
AIME: Claude Sonnet 4.5 88.2% against GPT-4o (2024-08-06) 14.0%, 74.2 points apart on a 0 to 100 scale.
Output price
Claude Sonnet 4.5 $15.00 against GPT-4o (2024-08-06) $10.00 per million output tokens, 1.5x apart.
Context window
Claude Sonnet 4.5 takes 1M tokens, GPT-4o (2024-08-06) 128K.

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 4.5BarsGPT-4o (2024-08-06)Ties
Coding20
Intelligence10
Reasoning70
Math70
Knowledge110
General160
All shared boards440
CodingLike-for-likeSix of these boards feed the Vibe Coding Index20
Coding benchmarks for Claude Sonnet 4.5 and GPT-4o (2024-08-06)
BenchmarkClaude Sonnet 4.5GPT-4o (2024-08-06)Leader
Aider polyglotNot measured23.1%Only GPT-4o (2024-08-06) measured
SWE-bench Verified74.8%Not measuredOnly Claude Sonnet 4.5 measured
SWE-bench LiteNot measured21.7%Only GPT-4o (2024-08-06) 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%Not measuredOnly Claude Sonnet 4.5 measured
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 measured31.7%Only GPT-4o (2024-08-06) measured
Terminal-Bench Hard (Artificial Analysis run)Not measured8.3%Only GPT-4o (2024-08-06) measured
Terminal-Bench46.5%Not measuredOnly Claude Sonnet 4.5 measured
GSO-Bench14.7%Not measuredOnly Claude Sonnet 4.5 measured
WeirdML47.7%Not measuredOnly Claude Sonnet 4.5 measured
Cybench60.0%Not measuredOnly Claude Sonnet 4.5 measured
LMArena Text: coding14881283Claude Sonnet 4.5
LMArena Text: software and IT14731278Claude Sonnet 4.5
LMArena WebDev: React1386Not measuredOnly Claude Sonnet 4.5 measured
LMArena WebDev: HTML1399Not measuredOnly Claude Sonnet 4.5 measured
Neither model has a result on the other 24 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index10
Intelligence benchmarks for Claude Sonnet 4.5 and GPT-4o (2024-08-06)
BenchmarkClaude Sonnet 4.5GPT-4o (2024-08-06)Leader
AA Intelligence Index20.77.7Claude Sonnet 4.5
Epoch Capabilities Index146.7Not measuredOnly Claude Sonnet 4.5 measured
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index13 boards, none shared
Agentic work benchmarks for Claude Sonnet 4.5 and GPT-4o (2024-08-06)
BenchmarkClaude Sonnet 4.5GPT-4o (2024-08-06)Leader
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 apps1136Not measuredOnly Claude Sonnet 4.5 measured
τ²-Bench TelecomNot measured28.9%Only GPT-4o (2024-08-06) 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
MCP Atlas59.5%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 index70
Reasoning benchmarks for Claude Sonnet 4.5 and GPT-4o (2024-08-06)
BenchmarkClaude Sonnet 4.5GPT-4o (2024-08-06)Leader
GPQA Diamond81.6%Not measuredOnly Claude Sonnet 4.5 measured
MMMU Pro (Vals AI)79.3%64.0%Claude Sonnet 4.5
GPQA Diamond (Artificial Analysis run)Not measured52.1%Only GPT-4o (2024-08-06) measured
Humanity's Last Exam (Artificial Analysis run)Not measured2.3%Only GPT-4o (2024-08-06) measured
GPQA Diamond (Epoch AI run)82.3%49.2%Claude Sonnet 4.5
ARC-AGI63.7%Not measuredOnly Claude Sonnet 4.5 measured
ARC-AGI-213.6%Not measuredOnly Claude Sonnet 4.5 measured
SimpleBench54.3%17.8%Claude Sonnet 4.5
Chess puzzles10.0%6.0%Claude Sonnet 4.5
Mystery game puzzles17.0%Not measuredOnly Claude Sonnet 4.5 measured
EBR-bench2.4%Not measuredOnly Claude Sonnet 4.5 measured
VPCT39.8%Not measuredOnly Claude Sonnet 4.5 measured
LMArena Text: hard prompts14621264Claude Sonnet 4.5
LMArena Text: expert14831241Claude Sonnet 4.5
LMArena Text: hard prompts in English14711277Claude Sonnet 4.5
Kagi LLM Benchmark57.9%Not measuredOnly Claude Sonnet 4.5 measured
Neither model has a result on the other 7 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index70
Math benchmarks for Claude Sonnet 4.5 and GPT-4o (2024-08-06)
BenchmarkClaude Sonnet 4.5GPT-4o (2024-08-06)Leader
AIME88.2%14.0%Claude Sonnet 4.5
MATH 500 (Vals AI)Not measured75.2%Only GPT-4o (2024-08-06) measured
MGSM (Vals AI)94.3%90.7%Claude Sonnet 4.5
OTIS Mock AIME77.8%6.4%Claude Sonnet 4.5
FrontierMath, tiers 1 to 323.9%0.4%Claude Sonnet 4.5
FrontierMath, tier 42.4%Not measuredOnly Claude Sonnet 4.5 measured
ProofBench19.0%Not measuredOnly Claude Sonnet 4.5 measured
MATH level 597.7%53.3%Claude Sonnet 4.5
LMArena Text: math14491285Claude Sonnet 4.5
LMArena Text: mathematical work14621283Claude Sonnet 4.5
MathArena12.6%Not measuredOnly Claude Sonnet 4.5 measured
Neither model has a result on the other 3 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index110
Knowledge benchmarks for Claude Sonnet 4.5 and GPT-4o (2024-08-06)
BenchmarkClaude Sonnet 4.5GPT-4o (2024-08-06)Leader
MMLU Pro87.4%74.1%Claude Sonnet 4.5
LegalBench (Vals AI)84.1%80.1%Claude Sonnet 4.5
CaseLaw (Vals AI)62.2%Not measuredOnly Claude Sonnet 4.5 measured
CorpFin (Vals AI)62.0%39.4%Claude Sonnet 4.5
TaxEval (Vals AI)73.3%71.1%Claude Sonnet 4.5
MortgageTax (Vals AI)64.0%61.0%Claude Sonnet 4.5
MedQA (Vals AI)94.7%88.2%Claude Sonnet 4.5
MedCode (Vals AI)44.1%Not measuredOnly Claude Sonnet 4.5 measured
SimpleQA Verified30.7%26.0%Claude Sonnet 4.5
MMLUNot measured84.3%Only GPT-4o (2024-08-06) measured
LMArena Text: science14481274Claude Sonnet 4.5
LMArena Text: medicine and healthcare14441252Claude Sonnet 4.5
LMArena Text: legal and government14511275Claude Sonnet 4.5
LMArena Text: business and finance14401232Claude Sonnet 4.5
FACTS Benchmark Suite40.6%Not measuredOnly Claude Sonnet 4.5 measured
PRBench Finance43.8%Not measuredOnly Claude Sonnet 4.5 measured
PRBench Legal40.8%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 GPT-4o (2024-08-06)
BenchmarkClaude Sonnet 4.5GPT-4o (2024-08-06)Leader
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: SVG1114Not 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 index160
General benchmarks for Claude Sonnet 4.5 and GPT-4o (2024-08-06)
BenchmarkClaude Sonnet 4.5GPT-4o (2024-08-06)Leader
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 measured36.0%Only GPT-4o (2024-08-06) measured
Long context reasoning (AA-LCR)Not measured41.0%Only GPT-4o (2024-08-06) measured
DTBench83.2%Not measuredOnly Claude Sonnet 4.5 measured
LMCA38.8%Not measuredOnly Claude Sonnet 4.5 measured
LMArena Text14381283Claude Sonnet 4.5
LMArena Text: instruction following14591267Claude Sonnet 4.5
LMArena Text: creative writing14421274Claude Sonnet 4.5
LMArena VisionNot measured1065Only GPT-4o (2024-08-06) measured
LMArena Text: English14501297Claude Sonnet 4.5
LMArena Text: non-English14251262Claude Sonnet 4.5
LMArena Text: Chinese14601254Claude Sonnet 4.5
LMArena Text: German14271257Claude Sonnet 4.5
LMArena Text: Japanese13901234Claude Sonnet 4.5
LMArena Text: Korean14021218Claude Sonnet 4.5
LMArena Text: French14591263Claude Sonnet 4.5
LMArena Text: Spanish14581269Claude Sonnet 4.5
LMArena Text: Russian14371272Claude Sonnet 4.5
LMArena Text: Polish1423Not measuredOnly Claude Sonnet 4.5 measured
LMArena Text: multi-turn14651279Claude Sonnet 4.5
LMArena Text: longer queries14751283Claude Sonnet 4.5
LMArena Text: writing and language14421290Claude Sonnet 4.5
LMArena Text: entertainment and media14281267Claude Sonnet 4.5
LMArena Vision: EnglishNot measured1072Only GPT-4o (2024-08-06) measured
LMArena Vision: ChineseNot measured1009Only GPT-4o (2024-08-06) measured
LMArena Document1450Not measuredOnly Claude Sonnet 4.5 measured
MultiChallenge55.3%Not 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 GPT-4o (2024-08-06)
BenchmarkClaude Sonnet 4.5GPT-4o (2024-08-06)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 Sonnet 4.5$0.011Fits in one request
GPT-4o (2024-08-06)$0.0075Fits in one request

GPT-4o (2024-08-06) costs less

Repository review

50K input + 3K output tokens

Claude Sonnet 4.5$0.195Fits in one request
GPT-4o (2024-08-06)$0.155Fits in one request

GPT-4o (2024-08-06) costs less

Agent loop

200K input + 10K output tokens

Claude Sonnet 4.5$0.750Fits in one request
GPT-4o (2024-08-06)$0.600Exceeds the context window

GPT-4o (2024-08-06) 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 GPT-4o (2024-08-06)
SpecificationAnthropic Claude Sonnet 4.5OpenAI GPT-4o (2024-08-06)
MakerAnthropicOpenAI
WeightsNo public weights listedNo public weights listed
ReleasedSeptember 29, 2025August 6, 2024
Context window1M128K
Input $/Mtok$3.00$2.50
Output $/Mtok$15.00$10.00
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 GPT-4o (2024-08-06) for coding?

Only Claude Sonnet 4.5 has a coding score, 39.5 on the Vibe Coding Index; GPT-4o (2024-08-06) has none, so the two cannot be ranked on coding. Pick GPT-4o (2024-08-06) for output tokens 1.5x cheaper ($10.00 vs $15.00 per million).

Which is cheaper, Claude Sonnet 4.5 or GPT-4o (2024-08-06)?

Claude Sonnet 4.5 costs $3.00 per million input tokens and $15.00 per million output tokens; GPT-4o (2024-08-06) costs $2.50 and $10.00. Cost per solved task is known for Claude Sonnet 4.5 only.

Which has the bigger context window, Claude Sonnet 4.5 or GPT-4o (2024-08-06)?

Claude Sonnet 4.5, with 1M tokens against 128K.

How many benchmarks is the Claude Sonnet 4.5 vs GPT-4o (2024-08-06) comparison based on?

44 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 GPT-4o (2024-08-06)'s on 0. Where only one model has a result, the page says so instead of naming a winner.

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