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GPT-5 vs Grok 4.5

Grok 4.5 leads GPT-5 on coding, 58.6 to 38.8 on the Vibe Coding Index, and Grok 4.5 costs 1.7x less per output token ($6.00 vs $10.00 per million). Updated October 22, 2026; 82 benchmarks have a result for both.

Replace GPT-5 Replace Grok 4.5
GPT-5OpenAI
Coding
38.8
Overall
51.5
Output $/M
$10.00
10
Grok 4.5xAI
Coding
58.6
Overall
62.1
Output $/M
$6.00
72
vs boards won of 82 shared

GPT-5 or Grok 4.5: which to pick

Pick Grok 4.5 for coding: it scores 58.6 on the Vibe Coding Index against 38.8 for GPT-5.

Pick GPT-5 for a lower cost per solved task ($0.39 against $0.62) and work measured by WeirdML or MMMU Pro (Vals AI), where it leads.

Model AGPT-5OpenAI38.8/1003 independent benchmarks$0.39 per solved taskModel BGrok 4.5xAI58.6/1006 independent benchmarks$0.62 per solved task
Shared results
82
GPT-5 only
31
Grok 4.5 only
41
Like-for-like categories
7 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
GPT-5 38.8 from 3 benchmarks, Grok 4.5 58.6 from 6 benchmarks.
Widest category
Coding, 18.0 points apart on average over 11 shared benchmarks.
Widest single gap
Vibe Code Bench (Vals AI): GPT-5 20.1% against Grok 4.5 69.0%, 48.9 points apart on a 0 to 100 scale.
Output price
GPT-5 $10.00 against Grok 4.5 $6.00 per million output tokens, 1.7x apart.
Context window
GPT-5 takes 400K tokens, Grok 4.5 500K.

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
CategoryGPT-5BarsGrok 4.5Ties
Coding110
Intelligence02
Reasoning213
Math06
Knowledge66
Web design08
General127
All shared boards1072
CodingLike-for-likeSix of these boards feed the Vibe Coding Index110
Coding benchmarks for GPT-5 and Grok 4.5
BenchmarkGPT-5Grok 4.5Leader
Aider polyglot88.0%Not measuredOnly GPT-5 measured
SWE-bench Verified74.4%Not measuredOnly GPT-5 measured
LiveBench codingNot measured94.3%Only Grok 4.5 measured
LMArena WebDev14181553Grok 4.5
AA Coding Index37.872.4Grok 4.5
LiveCodeBench (Vals AI)85.9%87.3%Grok 4.5
SWE-bench Verified (Vals AI)69.0%86.6%Grok 4.5
Terminal-Bench 4 (Vals AI)Not measured8.6%Only Grok 4.5 measured
Vibe Code Bench (Vals AI)20.1%69.0%Grok 4.5
Code migration (Vals AI)Not measured36.6%Only Grok 4.5 measured
ProgramBench (Vals AI)Not measured0.0%Only Grok 4.5 measured
IOI (Vals AI)Not measured40.6%Only Grok 4.5 measured
Terminal-Bench 2.1 (Vals AI)Not measured67.8%Only Grok 4.5 measured
SkillsBench (Vals AI)Not measured66.0%Only Grok 4.5 measured
CyberBench (Vals AI)Not measured71.0%Only Grok 4.5 measured
LiveCodeBench (Artificial Analysis run)84.6%Not measuredOnly GPT-5 measured
SciCodeNot measured55.0%Only Grok 4.5 measured
Terminal-Bench Hard (Artificial Analysis run)37.9%Not measuredOnly GPT-5 measured
Terminal-Bench49.6%Not measuredOnly GPT-5 measured
FrontierCodeNot measured42.4%Only Grok 4.5 measured
GSO-Bench6.9%Not measuredOnly GPT-5 measured
WeirdML60.7%46.4%GPT-5
ALE-Bench807.61309.3Grok 4.5
LMArena Text: coding14361474Grok 4.5
LMArena Text: software and IT14201471Grok 4.5
LMArena WebDev: ReactNot measured1556Only Grok 4.5 measured
LMArena WebDev: HTML14271567Grok 4.5
LMArena WebDev: from an imageNot measured1562Only Grok 4.5 measured
SciCode0.0%6.5%Grok 4.5
Neither model has a result on the other 10 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index02
Intelligence benchmarks for GPT-5 and Grok 4.5
BenchmarkGPT-5Grok 4.5Leader
AA Intelligence Index23.038.8Grok 4.5
Epoch Capabilities Index150.0154.1Grok 4.5
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index29 boards, none shared
Agentic work benchmarks for GPT-5 and Grok 4.5
BenchmarkGPT-5Grok 4.5Leader
AA Agentic IndexNot measured41.2Only Grok 4.5 measured
Design Arena: agents building web appsNot measured1218Only Grok 4.5 measured
Design Arena: agents building full-stack appsNot measured1249Only Grok 4.5 measured
Design Arena: agents building mobile appsNot measured1220Only Grok 4.5 measured
Design Arena: agents building Android appsNot measured1236Only Grok 4.5 measured
Design Arena: agents building Godot gamesNot measured1229Only Grok 4.5 measured
Design Arena: agents building gamesNot measured1236Only Grok 4.5 measured
Design Arena: HTML slidesNot measured1205Only Grok 4.5 measured
Design Arena: PowerPoint slidesNot measured1230Only Grok 4.5 measured
LiveBench researchNot measured85.9%Only Grok 4.5 measured
LiveBench browserNot measured44.0%Only Grok 4.5 measured
LiveBench long agenticNot measured27.9%Only Grok 4.5 measured
SREBench (Vals AI)Not measured0.8%Only Grok 4.5 measured
Finance Agent (Vals AI)Not measured48.4%Only Grok 4.5 measured
Tax Agent Bench (Vals AI)Not measured24.9%Only Grok 4.5 measured
Legal Research Bench (Vals AI)Not measured38.0%Only Grok 4.5 measured
Excel Modeling Benchmark (Vals AI)Not measured52.9%Only Grok 4.5 measured
Time Horizon Index (Vals AI)Not measured6.3%Only Grok 4.5 measured
τ²-Bench Telecom86.5%Not measuredOnly GPT-5 measured
APEX-AgentsNot measured56.2%Only Grok 4.5 measured
METR time horizons69.6%Not measuredOnly GPT-5 measured
Remote Labor Index1.7%Not measuredOnly GPT-5 measured
GDPval34.8%Not measuredOnly GPT-5 measured
BALROG32.8%Not measuredOnly GPT-5 measured
DeepResearch Bench49.6%Not measuredOnly GPT-5 measured
PostTrainBenchNot measured23.4%Only Grok 4.5 measured
Vending-Bench 2Not measured$3,887Only Grok 4.5 measured
LMArena SearchNot measured1216Only Grok 4.5 measured
BrowseComp-Plus80.0%Not measuredOnly GPT-5 measured
Neither model has a result on the other 12 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index213
Reasoning benchmarks for GPT-5 and Grok 4.5
BenchmarkGPT-5Grok 4.5Leader
GPQA Diamond85.6%92.9%Grok 4.5
LiveBench reasoningNot measured87.2%Only Grok 4.5 measured
MMMU Pro (Vals AI)81.5%61.8%GPT-5
GPQA Diamond (Artificial Analysis run)85.4%93.1%Grok 4.5
Humanity's Last Exam (Artificial Analysis run)28.5%42.7%Grok 4.5
GPQA Diamond (Epoch AI run)86.2%93.4%Grok 4.5
ARC-AGI65.7%87.2%Grok 4.5
ARC-AGI-29.9%52.6%Grok 4.5
SimpleBench56.7%70.0%Grok 4.5
Chess puzzles36.0%35.0%GPT-5
Mystery game puzzles23.0%Not measuredOnly GPT-5 measured
EBR-bench12.7%Not measuredOnly GPT-5 measured
VPCT66.0%Not measuredOnly GPT-5 measured
LMArena Text: hard prompts14151462Grok 4.5
LMArena Text: expert14191465Grok 4.5
LMArena Text: hard prompts in English14191464Grok 4.5
LMArena Vision: diagrams12521304Grok 4.5
LMArena Vision: homework12781295Grok 4.5
Kagi LLM Benchmark72.7%83.5%Grok 4.5
Neither model has a result on the other 3 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index06
Math benchmarks for GPT-5 and Grok 4.5
BenchmarkGPT-5Grok 4.5Leader
AIME93.4%Not measuredOnly GPT-5 measured
MATH 500 (Vals AI)96.0%Not measuredOnly GPT-5 measured
MGSM (Vals AI)92.8%Not measuredOnly GPT-5 measured
AA Math Index94.3Not measuredOnly GPT-5 measured
AIME 2025 (Artificial Analysis run)94.3%Not measuredOnly GPT-5 measured
OTIS Mock AIME91.4%97.8%Grok 4.5
FrontierMath, tiers 1 to 355.4%57.2%Grok 4.5
FrontierMath, tier 422.0%24.4%Grok 4.5
ProofBench18.0%31.0%Grok 4.5
MATH level 598.1%Not measuredOnly GPT-5 measured
LMArena Text: math14071460Grok 4.5
LMArena Text: mathematical work14051482Grok 4.5
Neither model has a result on the other 1 board here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index66
Knowledge benchmarks for GPT-5 and Grok 4.5
BenchmarkGPT-5Grok 4.5Leader
MMLU Pro86.5%89.2%Grok 4.5
LegalBench (Vals AI)86.0%86.0%GPT-5
CaseLaw (Vals AI)66.5%Not measuredOnly GPT-5 measured
CorpFin (Vals AI)61.1%67.4%Grok 4.5
TaxEval (Vals AI)73.4%71.7%GPT-5
MortgageTax (Vals AI)65.5%61.8%GPT-5
MedQA (Vals AI)96.3%Not measuredOnly GPT-5 measured
MedCode (Vals AI)49.6%43.3%GPT-5
MMLU Pro (Artificial Analysis run)87.1%Not measuredOnly GPT-5 measured
SimpleQA Verified50.1%48.3%GPT-5
GeoBench81.0%Not measuredOnly GPT-5 measured
LMArena Text: science14161464Grok 4.5
LMArena Text: medicine and healthcare14131440Grok 4.5
LMArena Text: legal and government14311463Grok 4.5
LMArena Text: business and finance14001441Grok 4.5
FACTS Benchmark Suite56.5%50.2%GPT-5
Neither model has a result on the other 2 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index08
Web design benchmarks for GPT-5 and Grok 4.5
BenchmarkGPT-5Grok 4.5Leader
Design Arena: websites11841281Grok 4.5
Design Arena: UI components11771280Grok 4.5
Design Arena: game dev11851264Grok 4.5
Design Arena: data viz12211266Grok 4.5
Design Arena: 3D10551257Grok 4.5
Design Arena: all code categories11671275Grok 4.5
Design Arena: SVG11881215Grok 4.5
Design Arena: ASCII art11411256Grok 4.5
LiveBench designNot measured78.1%Only Grok 4.5 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index127
General benchmarks for GPT-5 and Grok 4.5
BenchmarkGPT-5Grok 4.5Leader
LiveBench data analysisNot measured73.0%Only Grok 4.5 measured
SAGE (Vals AI)43.7%35.0%GPT-5
MedScribe (Vals AI)83.7%86.9%Grok 4.5
Vals Multimodal IndexNot measured63.4%Only Grok 4.5 measured
IFBench73.1%Not measuredOnly GPT-5 measured
Long context reasoning (AA-LCR)78.2%79.3%Grok 4.5
DTBench90.7%96.5%Grok 4.5
LMCA40.0%45.2%Grok 4.5
Fiction.LiveBench97.2%Not measuredOnly GPT-5 measured
Creative writing (Lech Mazur)86.0%Not measuredOnly GPT-5 measured
Surface Evolver BenchNot measured74.4%Only Grok 4.5 measured
Furniture assemblyNot measured22.5%Only Grok 4.5 measured
LMArena Text14061448Grok 4.5
LMArena Text: instruction following13881445Grok 4.5
LMArena Text: creative writing13651442Grok 4.5
LMArena Vision12321287Grok 4.5
LMArena Text: English14091453Grok 4.5
LMArena Text: non-English13971440Grok 4.5
LMArena Text: Chinese14221495Grok 4.5
LMArena Text: German14161448Grok 4.5
LMArena Text: Japanese14091430Grok 4.5
LMArena Text: Korean13601406Grok 4.5
LMArena Text: French14091457Grok 4.5
LMArena Text: Spanish13991451Grok 4.5
LMArena Text: Russian14071449Grok 4.5
LMArena Text: Polish14311432Grok 4.5
LMArena Text: multi-turn14261456Grok 4.5
LMArena Text: longer queries13991462Grok 4.5
LMArena Text: writing and language13841445Grok 4.5
LMArena Text: entertainment and media13791434Grok 4.5
LMArena Vision: English12311285Grok 4.5
LMArena Vision: Chinese12671345Grok 4.5
LMArena Vision: reading text12461293Grok 4.5
LMArena Vision: humor12191276Grok 4.5
LMArena Vision: captioning1212Not measuredOnly GPT-5 measured
LMArena Vision: recognizing things1263Not measuredOnly GPT-5 measured
LMArena Vision: creative writing12101293Grok 4.5
LMArena DocumentNot measured1452Only Grok 4.5 measured
Neither model has a result on the other 8 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for GPT-5 and Grok 4.5
BenchmarkGPT-5Grok 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

GPT-5$0.0063Fits in one request
Grok 4.5$0.0050Fits in one request

Grok 4.5 costs less

Repository review

50K input + 3K output tokens

GPT-5$0.092Fits in one request
Grok 4.5$0.118Fits in one request

GPT-5 costs less

Agent loop

200K input + 10K output tokens

GPT-5$0.350Fits in one request
Grok 4.5$0.460Fits in one request

GPT-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 GPT-5 and Grok 4.5
SpecificationOpenAI GPT-5SpaceXAI Grok 4.5
MakerOpenAIxAI
WeightsNo public weights listedNo public weights listed
ReleasedAugust 7, 2025July 8, 2026
Context window400K500K
Input $/Mtok$1.25$2.00
Output $/Mtok$10.00$6.00
Coding index38.858.6
Independent measurements behind it36
Cost per solved task$0.39$0.62
SourceOpenRouter listingOpenRouter listing

Questions

Is GPT-5 better than Grok 4.5 for coding?

Pick Grok 4.5 for coding: it scores 58.6 on the Vibe Coding Index against 38.8 for GPT-5. Pick GPT-5 for a lower cost per solved task ($0.39 against $0.62) and work measured by WeirdML or MMMU Pro (Vals AI), where it leads.

Which is cheaper, GPT-5 or Grok 4.5?

GPT-5 costs $1.25 per million input tokens and $10.00 per million output tokens; Grok 4.5 costs $2.00 and $6.00. Per solved SWE-bench Verified task, GPT-5 costs $0.39 and Grok 4.5 $0.62.

Which has the bigger context window, GPT-5 or Grok 4.5?

Grok 4.5, with 500K tokens against 400K.

How many benchmarks is the GPT-5 vs Grok 4.5 comparison based on?

82 benchmarks have a result for both models as of October 22, 2026. GPT-5's coding index rests on 3 independent benchmarks and Grok 4.5's on 6. Where only one model has a result, the page says so instead of naming a winner.

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