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Claude Haiku 4.5 vs Grok 4.3

Updated October 21, 2026. 73 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.

Replace Claude Haiku 4.5 Replace Grok 4.3
Claude Haiku 4.5Anthropic
Coding
49.8
Overall
16.9
Output $/M
$5.00
28
Grok 4.3xAI
Coding
22.5
Overall
24.9
Output $/M
$2.50
44
vs boards won of 73 shared, 1 tied

Decision reading

Pick Claude Haiku 4.5 for coding: it scores 49.8 on the Vibe Coding Index against 22.5 for Grok 4.3.

Pick Grok 4.3 when output tokens cost 2.0x less, or when a solved task costs $0.31 against $0.56.

Model AClaude Haiku 4.5Anthropic49.8/1003 independent benchmarks$0.56 per solved taskModel BGrok 4.3xAI22.5/1001 independent benchmark$0.31 per solved task
Shared results
73
Claude Haiku 4.5 only
21
Grok 4.3 only
31
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 Haiku 4.5 49.8 from 3 benchmarks, Grok 4.3 22.5 from 1 benchmark.
Widest category
Reasoning, 14.7 points apart on average over 7 shared benchmarks.
Widest single gap
LiveCodeBench (Vals AI): Claude Haiku 4.5 41.2% against Grok 4.3 84.5%, 43.3 points apart on a 0 to 100 scale.
Output price
Claude Haiku 4.5 $5.00 against Grok 4.3 $2.50 per million output tokens, 2.0x apart.
Context window
Claude Haiku 4.5 takes 200K tokens, Grok 4.3 1M.

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 Haiku 4.5BarsGrok 4.3Ties
Coding571 tie
Intelligence01
Agentic work24
Reasoning34
Math21
Knowledge57
Web design17
General1013
All shared boards28441 tie
CodingLike-for-likeFour of these boards feed the Vibe Coding Index57
Coding benchmarks for Claude Haiku 4.5 and Grok 4.3
BenchmarkClaude Haiku 4.5Grok 4.3Leader
SWE-bench Verified66.6%Not measuredOnly Claude Haiku 4.5 measured
SWE-bench Multilingual64.7%Not measuredOnly Claude Haiku 4.5 measured
LiveBench coding48.1%Not measuredOnly Claude Haiku 4.5 measured
LMArena WebDev13301358Grok 4.3
AA Coding Index43.942.2Claude Haiku 4.5
LiveCodeBench (Vals AI)41.2%84.5%Grok 4.3
SWE-bench Verified (Vals AI)66.6%71.4%Grok 4.3
Vibe Code Bench (Vals AI)11.4%19.4%Grok 4.3
Code migration (Vals AI)7.5%6.8%Claude Haiku 4.5
ProgramBench (Vals AI)0.0%0.0%Tie
Terminal-Bench 2.1 (Vals AI)43.8%42.0%Claude Haiku 4.5
SkillsBench (Vals AI)Not measured40.6%Only Grok 4.3 measured
SciCodeNot measured48.3%Only Grok 4.3 measured
Terminal-Bench Hard (Artificial Analysis run)Not measured37.9%Only Grok 4.3 measured
Terminal-Bench35.5%Not measuredOnly Claude Haiku 4.5 measured
WeirdML45.4%49.9%Grok 4.3
ALE-BenchNot measured944.2Only Grok 4.3 measured
LMArena Text: coding14541415Claude Haiku 4.5
LMArena Text: software and IT14391416Claude Haiku 4.5
LMArena WebDev: React13261353Grok 4.3
LMArena WebDev: HTML13181367Grok 4.3
LMArena WebDev: from an imageNot measured1375Only Grok 4.3 measured
Neither model has a result on the other 16 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index01
Intelligence benchmarks for Claude Haiku 4.5 and Grok 4.3
BenchmarkClaude Haiku 4.5Grok 4.3Leader
AA Intelligence Index16.924.9Grok 4.3
Epoch Capabilities Index142.2Not measuredOnly Claude Haiku 4.5 measured
Agentic workLike-for-likePublic boards, shown as published, kept out of the index24
Agentic work benchmarks for Claude Haiku 4.5 and Grok 4.3
BenchmarkClaude Haiku 4.5Grok 4.3Leader
AA Agentic Index8.015.5Grok 4.3
Design Arena: agents building web appsNot measured1126Only Grok 4.3 measured
Design Arena: agents building full-stack appsNot measured1006Only Grok 4.3 measured
Design Arena: agents building mobile appsNot measured1059Only Grok 4.3 measured
Design Arena: agents building Android appsNot measured967Only Grok 4.3 measured
Design Arena: agents building Godot gamesNot measured914Only Grok 4.3 measured
Design Arena: agents building gamesNot measured1007Only Grok 4.3 measured
Design Arena: HTML slidesNot measured1008Only Grok 4.3 measured
Design Arena: PowerPoint slidesNot measured1012Only Grok 4.3 measured
LiveBench research42.2%Not measuredOnly Claude Haiku 4.5 measured
LiveBench browser40.0%Not measuredOnly Claude Haiku 4.5 measured
LiveBench long agentic11.1%Not measuredOnly Claude Haiku 4.5 measured
Finance Agent (Vals AI)31.0%37.7%Grok 4.3
Tax Agent Bench (Vals AI)5.9%6.2%Grok 4.3
Legal Research Bench (Vals AI)10.6%15.4%Grok 4.3
Excel Modeling Benchmark (Vals AI)22.7%18.4%Claude Haiku 4.5
τ²-Bench TelecomNot measured97.7%Only Grok 4.3 measured
BALROG31.2%Not measuredOnly Claude Haiku 4.5 measured
DeepResearch Bench45.5%Not measuredOnly Claude Haiku 4.5 measured
Vending-Bench 2$459$35Claude Haiku 4.5
LMArena SearchNot measured1166Only Grok 4.3 measured
Neither model has a result on the other 18 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index34
Reasoning benchmarks for Claude Haiku 4.5 and Grok 4.3
BenchmarkClaude Haiku 4.5Grok 4.3Leader
GPQA Diamond72.2%91.4%Grok 4.3
LiveBench reasoning61.7%Not measuredOnly Claude Haiku 4.5 measured
MMMU Pro (Vals AI)46.1%83.1%Grok 4.3
GPQA Diamond (Artificial Analysis run)Not measured90.1%Only Grok 4.3 measured
Humanity's Last Exam (Artificial Analysis run)Not measured37.2%Only Grok 4.3 measured
GPQA Diamond (Epoch AI run)71.2%88.8%Grok 4.3
ARC-AGI47.7%Not measuredOnly Claude Haiku 4.5 measured
ARC-AGI-24.0%Not measuredOnly Claude Haiku 4.5 measured
Chess puzzles8.0%18.0%Grok 4.3
LMArena Text: hard prompts14211396Claude Haiku 4.5
LMArena Text: expert14431384Claude Haiku 4.5
LMArena Text: hard prompts in English14351402Claude Haiku 4.5
LMArena Vision: diagramsNot measured1241Only Grok 4.3 measured
LMArena Vision: homeworkNot measured1241Only Grok 4.3 measured
Neither model has a result on the other 7 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index21
Math benchmarks for Claude Haiku 4.5 and Grok 4.3
BenchmarkClaude Haiku 4.5Grok 4.3Leader
AIME82.7%Not measuredOnly Claude Haiku 4.5 measured
MGSM (Vals AI)92.2%Not measuredOnly Claude Haiku 4.5 measured
OTIS Mock AIME66.7%93.3%Grok 4.3
FrontierMath, tiers 1 to 3Not measured42.8%Only Grok 4.3 measured
FrontierMath, tier 4Not measured14.6%Only Grok 4.3 measured
ProofBenchNot measured11.0%Only Grok 4.3 measured
MATH level 596.4%Not measuredOnly Claude Haiku 4.5 measured
LMArena Text: math13981387Claude Haiku 4.5
LMArena Text: mathematical work14301396Claude Haiku 4.5
Neither model has a result on the other 4 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index57
Knowledge benchmarks for Claude Haiku 4.5 and Grok 4.3
BenchmarkClaude Haiku 4.5Grok 4.3Leader
MMLU Pro78.7%85.8%Grok 4.3
LegalBench (Vals AI)81.2%84.5%Grok 4.3
CaseLaw (Vals AI)56.5%79.3%Grok 4.3
CorpFin (Vals AI)60.6%68.5%Grok 4.3
TaxEval (Vals AI)67.5%70.8%Grok 4.3
MortgageTax (Vals AI)62.2%48.3%Claude Haiku 4.5
MedQA (Vals AI)79.6%Not measuredOnly Claude Haiku 4.5 measured
MedCode (Vals AI)32.7%38.1%Grok 4.3
SimpleQA Verified13.2%33.2%Grok 4.3
LMArena Text: science14061399Claude Haiku 4.5
LMArena Text: medicine and healthcare13941384Claude Haiku 4.5
LMArena Text: legal and government14001386Claude Haiku 4.5
LMArena Text: business and finance14001381Claude Haiku 4.5
Neither model has a result on the other 4 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index17
Web design benchmarks for Claude Haiku 4.5 and Grok 4.3
BenchmarkClaude Haiku 4.5Grok 4.3Leader
Design Arena: websites11221196Grok 4.3
Design Arena: UI components11001192Grok 4.3
Design Arena: game dev10971174Grok 4.3
Design Arena: data viz11241180Grok 4.3
Design Arena: 3D10721125Grok 4.3
Design Arena: all code categories11151187Grok 4.3
Design Arena: SVG10251081Grok 4.3
Design Arena: ASCII art11391125Claude Haiku 4.5
LiveBench design59.9%Not measuredOnly Claude Haiku 4.5 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index1013
General benchmarks for Claude Haiku 4.5 and Grok 4.3
BenchmarkClaude Haiku 4.5Grok 4.3Leader
LiveBench data analysis59.3%Not measuredOnly Claude Haiku 4.5 measured
Public Benefits Bench (Vals AI)54.3%51.7%Claude Haiku 4.5
SAGE (Vals AI)31.8%19.7%Claude Haiku 4.5
MedScribe (Vals AI)85.2%74.4%Claude Haiku 4.5
Vals Multimodal Index42.9%43.3%Grok 4.3
IFBenchNot measured83.3%Only Grok 4.3 measured
Long context reasoning (AA-LCR)Not measured75.0%Only Grok 4.3 measured
DTBench73.6%90.7%Grok 4.3
LMCA30.9%38.3%Grok 4.3
ExploitBench13.7%Not measuredOnly Claude Haiku 4.5 measured
LMArena Text13971397Claude Haiku 4.5
LMArena Text: instruction following14141366Claude Haiku 4.5
LMArena Text: creative writing13711380Grok 4.3
LMArena VisionNot measured1229Only Grok 4.3 measured
LMArena Text: English14141404Claude Haiku 4.5
LMArena Text: non-English13771385Grok 4.3
LMArena Text: Chinese14181422Grok 4.3
LMArena Text: German13741395Grok 4.3
LMArena Text: Japanese13381379Grok 4.3
LMArena Text: Korean13461354Grok 4.3
LMArena Text: French14111411Grok 4.3
LMArena Text: Spanish14211399Claude Haiku 4.5
LMArena Text: Russian13811399Grok 4.3
LMArena Text: Polish13431398Grok 4.3
LMArena Text: multi-turn14091406Claude Haiku 4.5
LMArena Text: longer queries14271393Claude Haiku 4.5
LMArena Text: writing and language13861385Claude Haiku 4.5
LMArena Text: entertainment and media13691370Grok 4.3
LMArena Vision: EnglishNot measured1235Only Grok 4.3 measured
LMArena Vision: ChineseNot measured1257Only Grok 4.3 measured
LMArena Vision: reading textNot measured1235Only Grok 4.3 measured
LMArena Vision: humorNot measured1222Only Grok 4.3 measured
LMArena Vision: recognizing thingsNot measured1217Only Grok 4.3 measured
LMArena Vision: creative writingNot measured1237Only Grok 4.3 measured
LMArena Document1420Not measuredOnly Claude Haiku 4.5 measured
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 Haiku 4.5 and Grok 4.3
BenchmarkClaude Haiku 4.5Grok 4.3Leader
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 Haiku 4.5$0.0035Fits in one request
Grok 4.3$0.0025Fits in one request

Grok 4.3 costs less

Repository review

50K input + 3K output tokens

Claude Haiku 4.5$0.065Fits in one request
Grok 4.3$0.070Fits in one request

Claude Haiku 4.5 costs less

Agent loop

200K input + 10K output tokens

Claude Haiku 4.5$0.250Exceeds the context window
Grok 4.3$0.275Fits in one request

Claude Haiku 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 Haiku 4.5 and Grok 4.3
SpecificationAnthropic Claude Haiku 4.5SpaceXAI Grok 4.3
MakerAnthropicxAI
WeightsNo public weights listedNo public weights listed
ReleasedOctober 15, 2025April 30, 2026
Context window200K1M
Input $/Mtok$1.00$1.25
Output $/Mtok$5.00$2.50
Coding index49.822.5
Independent measurements behind it31
Cost per solved task$0.56$0.31
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Haiku 4.5 better than Grok 4.3 for coding?

Pick Claude Haiku 4.5 for coding: it scores 49.8 on the Vibe Coding Index against 22.5 for Grok 4.3. Pick Grok 4.3 when output tokens cost 2.0x less, or when a solved task costs $0.31 against $0.56.

Which is cheaper, Claude Haiku 4.5 or Grok 4.3?

Claude Haiku 4.5 costs $1.00 per million input tokens and $5.00 per million output tokens; Grok 4.3 costs $1.25 and $2.50. Per solved SWE-bench Verified task, Claude Haiku 4.5 costs $0.56 and Grok 4.3 $0.31.

Which has the bigger context window, Claude Haiku 4.5 or Grok 4.3?

Grok 4.3, with 1M tokens against 200K.

How many benchmarks is the Claude Haiku 4.5 vs Grok 4.3 comparison based on?

73 benchmarks have a result for both models as of October 21, 2026. Claude Haiku 4.5's coding index rests on 3 independent benchmarks and Grok 4.3's on 1. Where only one model has a result, the page says so instead of naming a winner.

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