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Claude Fable 5 vs Grok 4.5

Claude Fable 5 leads Grok 4.5 on coding, 79.3 to 58.6 on the Vibe Coding Index, and Grok 4.5 costs 8.3x less per output token ($6.00 vs $50.00 per million). Updated October 22, 2026; 116 benchmarks have a result for both.

Replace Claude Fable 5 Replace Grok 4.5
Claude Fable 5Anthropic
Coding
79.3
Overall
79.0
Output $/M
$50.00
114
Grok 4.5xAI
Coding
58.6
Overall
62.1
Output $/M
$6.00
2
vs boards won of 116 shared

Claude Fable 5 or Grok 4.5: which to pick

Pick Claude Fable 5 for coding: it scores 79.3 on the Vibe Coding Index against 58.6 for Grok 4.5.

Pick Grok 4.5 for output tokens 8.3x cheaper ($6.00 vs $50.00 per million) and a lower cost per solved task ($0.62 against $2.16).

Model AClaude Fable 5Anthropic79.3/1006 independent benchmarks$2.16 per solved taskModel BGrok 4.5xAI58.6/1006 independent benchmarks$0.62 per solved task
Shared results
116
Claude Fable 5 only
11
Grok 4.5 only
7
Like-for-like categories
8 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 Fable 5 79.3 from 6 benchmarks, Grok 4.5 58.6 from 6 benchmarks.
Widest category
Math, 29.5 points apart on average over 6 shared benchmarks.
Widest single gap
FrontierMath, tier 4: Claude Fable 5 90.2% against Grok 4.5 24.4%, 65.8 points apart on a 0 to 100 scale.
Output price
Claude Fable 5 $50.00 against Grok 4.5 $6.00 per million output tokens, 8.3x apart.
Context window
Claude Fable 5 takes 1M 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
CategoryClaude Fable 5BarsGrok 4.5Ties
Coding190
Intelligence20
Agentic work200
Reasoning142
Math60
Knowledge110
Web design90
General330
All shared boards1142
CodingLike-for-likeSix of these boards feed the Vibe Coding Index190
Coding benchmarks for Claude Fable 5 and Grok 4.5
BenchmarkClaude Fable 5Grok 4.5Leader
LiveBench coding98.3%94.3%Claude Fable 5
LMArena WebDev16241553Claude Fable 5
AA Coding Index76.572.4Claude Fable 5
LiveCodeBench (Vals AI)89.8%87.3%Claude Fable 5
SWE-bench Verified (Vals AI)95.0%86.6%Claude Fable 5
Terminal-Bench 4 (Vals AI)41.4%8.6%Claude Fable 5
Vibe Code Bench (Vals AI)90.3%69.0%Claude Fable 5
Code migration (Vals AI)55.1%36.6%Claude Fable 5
ProgramBench (Vals AI)2.0%0.0%Claude Fable 5
IOI (Vals AI)Not measured40.6%Only Grok 4.5 measured
Terminal-Bench 2.1 (Vals AI)80.5%67.8%Claude Fable 5
SkillsBench (Vals AI)Not measured66.0%Only Grok 4.5 measured
CyberBench (Vals AI)Not measured71.0%Only Grok 4.5 measured
SciCode61.0%55.0%Claude Fable 5
Terminal-Bench Hard (Artificial Analysis run)62.9%Not measuredOnly Claude Fable 5 measured
FrontierCode53.5%42.4%Claude Fable 5
FrontierSWE47.0%Not measuredOnly Claude Fable 5 measured
GSO-Bench78.4%Not measuredOnly Claude Fable 5 measured
WeirdML91.9%46.4%Claude Fable 5
MirrorCode63.9%Not measuredOnly Claude Fable 5 measured
ALE-Bench2041.31309.3Claude Fable 5
LMArena Text: coding15181474Claude Fable 5
LMArena Text: software and IT15131471Claude Fable 5
LMArena WebDev: React16311556Claude Fable 5
LMArena WebDev: HTML16511567Claude Fable 5
LMArena WebDev: from an image16231562Claude Fable 5
SciCodeNot measured6.5%Only Grok 4.5 measured
Neither model has a result on the other 12 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Claude Fable 5 and Grok 4.5
BenchmarkClaude Fable 5Grok 4.5Leader
AA Intelligence Index49.638.8Claude Fable 5
Epoch Capabilities Index163.4154.1Claude Fable 5
Agentic workLike-for-likePublic boards, shown as published, kept out of the index200
Agentic work benchmarks for Claude Fable 5 and Grok 4.5
BenchmarkClaude Fable 5Grok 4.5Leader
AA Agentic Index50.741.2Claude Fable 5
Design Arena: agents building web apps12611218Claude Fable 5
Design Arena: agents building full-stack apps12801249Claude Fable 5
Design Arena: agents building mobile apps12641220Claude Fable 5
Design Arena: agents building Android apps12841236Claude Fable 5
Design Arena: agents building Godot games12921229Claude Fable 5
Design Arena: agents building games12851236Claude Fable 5
Design Arena: HTML slides12271205Claude Fable 5
Design Arena: PowerPoint slides12701230Claude Fable 5
LiveBench research86.9%85.9%Claude Fable 5
LiveBench browser92.0%44.0%Claude Fable 5
LiveBench long agentic53.2%27.9%Claude Fable 5
SREBench (Vals AI)Not measured0.8%Only Grok 4.5 measured
Finance Agent (Vals AI)56.3%48.4%Claude Fable 5
Tax Agent Bench (Vals AI)38.3%24.9%Claude Fable 5
Legal Research Bench (Vals AI)49.5%38.0%Claude Fable 5
Excel Modeling Benchmark (Vals AI)73.7%52.9%Claude Fable 5
Terminal-Bench-Science (Vals AI)15.7%Not measuredOnly Claude Fable 5 measured
Time Horizon Index (Vals AI)Not measured6.3%Only Grok 4.5 measured
τ²-Bench Telecom98.5%Not measuredOnly Claude Fable 5 measured
APEX-Agents63.6%56.2%Claude Fable 5
Remote Labor Index16.1%Not measuredOnly Claude Fable 5 measured
PostTrainBench41.8%23.4%Claude Fable 5
Vending-Bench 2$5,680$3,887Claude Fable 5
LMArena Search12291216Claude Fable 5
Neither model has a result on the other 16 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index142
Reasoning benchmarks for Claude Fable 5 and Grok 4.5
BenchmarkClaude Fable 5Grok 4.5Leader
GPQA Diamond93.2%92.9%Claude Fable 5
LiveBench reasoning89.7%87.2%Claude Fable 5
MMMU Pro (Vals AI)89.3%61.8%Claude Fable 5
GPQA Diamond (Artificial Analysis run)92.6%93.1%Grok 4.5
Humanity's Last Exam (Artificial Analysis run)55.5%42.7%Claude Fable 5
GPQA Diamond (Epoch AI run)85.9%93.4%Grok 4.5
ARC-AGI98.5%87.2%Claude Fable 5
ARC-AGI-289.2%52.6%Claude Fable 5
SimpleBench81.9%70.0%Claude Fable 5
Chess puzzles47.0%35.0%Claude Fable 5
Mystery game puzzles52.0%Not measuredOnly Claude Fable 5 measured
EBR-bench39.5%Not measuredOnly Claude Fable 5 measured
LMArena Text: hard prompts15071462Claude Fable 5
LMArena Text: expert15341465Claude Fable 5
LMArena Text: hard prompts in English15091464Claude Fable 5
LMArena Vision: diagrams13571304Claude Fable 5
LMArena Vision: homework13611295Claude Fable 5
Kagi LLM Benchmark91.4%83.5%Claude Fable 5
Neither model has a result on the other 4 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index60
Math benchmarks for Claude Fable 5 and Grok 4.5
BenchmarkClaude Fable 5Grok 4.5Leader
OTIS Mock AIME100.0%97.8%Claude Fable 5
FrontierMath, tiers 1 to 387.0%57.2%Claude Fable 5
FrontierMath, tier 490.2%24.4%Claude Fable 5
ProofBench95.0%31.0%Claude Fable 5
LMArena Text: math15161460Claude Fable 5
LMArena Text: mathematical work15151482Claude Fable 5
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index110
Knowledge benchmarks for Claude Fable 5 and Grok 4.5
BenchmarkClaude Fable 5Grok 4.5Leader
MMLU Pro91.5%89.2%Claude Fable 5
LegalBench (Vals AI)88.6%86.0%Claude Fable 5
CorpFin (Vals AI)71.8%67.4%Claude Fable 5
TaxEval (Vals AI)76.9%71.7%Claude Fable 5
MortgageTax (Vals AI)68.9%61.8%Claude Fable 5
MedCode (Vals AI)56.1%43.3%Claude Fable 5
SimpleQA Verified70.7%48.3%Claude Fable 5
LMArena Text: science15061464Claude Fable 5
LMArena Text: medicine and healthcare14801440Claude Fable 5
LMArena Text: legal and government14981463Claude Fable 5
LMArena Text: business and finance14801441Claude Fable 5
FACTS Benchmark SuiteNot measured50.2%Only Grok 4.5 measured
Neither model has a result on the other 6 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index90
Web design benchmarks for Claude Fable 5 and Grok 4.5
BenchmarkClaude Fable 5Grok 4.5Leader
Design Arena: websites12951281Claude Fable 5
Design Arena: UI components13161280Claude Fable 5
Design Arena: game dev13351264Claude Fable 5
Design Arena: data viz13041266Claude Fable 5
Design Arena: 3D13181257Claude Fable 5
Design Arena: all code categories13101275Claude Fable 5
Design Arena: SVG13021215Claude Fable 5
Design Arena: ASCII art13291256Claude Fable 5
LiveBench design84.7%78.1%Claude Fable 5
GeneralLike-for-likePublic boards, shown as published, kept out of the index330
General benchmarks for Claude Fable 5 and Grok 4.5
BenchmarkClaude Fable 5Grok 4.5Leader
LiveBench data analysis80.5%73.0%Claude Fable 5
Public Benefits Bench (Vals AI)70.4%Not measuredOnly Claude Fable 5 measured
SAGE (Vals AI)51.9%35.0%Claude Fable 5
MedScribe (Vals AI)88.5%86.9%Claude Fable 5
Vals Multimodal Index74.2%63.4%Claude Fable 5
IFBench63.5%Not measuredOnly Claude Fable 5 measured
Long context reasoning (AA-LCR)82.3%79.3%Claude Fable 5
DTBench98.4%96.5%Claude Fable 5
LMCA61.2%45.2%Claude Fable 5
Surface Evolver Bench95.0%74.4%Claude Fable 5
Furniture assembly35.8%22.5%Claude Fable 5
LMArena Text14911448Claude Fable 5
LMArena Text: instruction following15021445Claude Fable 5
LMArena Text: creative writing14941442Claude Fable 5
LMArena Vision13251287Claude Fable 5
LMArena Text: English14981453Claude Fable 5
LMArena Text: non-English14821440Claude Fable 5
LMArena Text: Chinese15431495Claude Fable 5
LMArena Text: German14861448Claude Fable 5
LMArena Text: Japanese15041430Claude Fable 5
LMArena Text: Korean14871406Claude Fable 5
LMArena Text: French15051457Claude Fable 5
LMArena Text: Spanish14981451Claude Fable 5
LMArena Text: Russian15031449Claude Fable 5
LMArena Text: Polish14941432Claude Fable 5
LMArena Text: multi-turn15041456Claude Fable 5
LMArena Text: longer queries15101462Claude Fable 5
LMArena Text: writing and language15011445Claude Fable 5
LMArena Text: entertainment and media14821434Claude Fable 5
LMArena Vision: English13231285Claude Fable 5
LMArena Vision: Chinese13731345Claude Fable 5
LMArena Vision: reading text13371293Claude Fable 5
LMArena Vision: humor13411276Claude Fable 5
LMArena Vision: creative writing13381293Claude Fable 5
LMArena Document14961452Claude Fable 5
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 Fable 5 and Grok 4.5
BenchmarkClaude Fable 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

Claude Fable 5$0.035Fits in one request
Grok 4.5$0.0050Fits in one request

Grok 4.5 costs less

Repository review

50K input + 3K output tokens

Claude Fable 5$0.650Fits in one request
Grok 4.5$0.118Fits in one request

Grok 4.5 costs less

Agent loop

200K input + 10K output tokens

Claude Fable 5$2.50Fits in one request
Grok 4.5$0.460Fits in one request

Grok 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 Fable 5 and Grok 4.5
SpecificationAnthropic Claude Fable 5SpaceXAI Grok 4.5
MakerAnthropicxAI
WeightsNo public weights listedNo public weights listed
ReleasedJune 9, 2026July 8, 2026
Context window1M500K
Input $/Mtok$10.00$2.00
Output $/Mtok$50.00$6.00
Coding index79.358.6
Independent measurements behind it66
Cost per solved task$2.16$0.62
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Fable 5 better than Grok 4.5 for coding?

Pick Claude Fable 5 for coding: it scores 79.3 on the Vibe Coding Index against 58.6 for Grok 4.5. Pick Grok 4.5 for output tokens 8.3x cheaper ($6.00 vs $50.00 per million) and a lower cost per solved task ($0.62 against $2.16).

Which is cheaper, Claude Fable 5 or Grok 4.5?

Claude Fable 5 costs $10.00 per million input tokens and $50.00 per million output tokens; Grok 4.5 costs $2.00 and $6.00. Per solved SWE-bench Verified task, Claude Fable 5 costs $2.16 and Grok 4.5 $0.62.

Which has the bigger context window, Claude Fable 5 or Grok 4.5?

Claude Fable 5, with 1M tokens against 500K.

How many benchmarks is the Claude Fable 5 vs Grok 4.5 comparison based on?

116 benchmarks have a result for both models as of October 22, 2026. Claude Fable 5's coding index rests on 6 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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