Claude Fable 5 vs Grok4.5
Wins 8 of 8 areas
Coding · Agents · Reasoning · Facts · Images and charts · Math · Long documents · Following instructions
Wins 0 of 8 areas
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Claude Fable 5 is the stronger all-rounder.Grok4.5 is cheaper.
Scores updated · 38 tests both models report · How we compare
Where each one wins
Tests won in each of the eight areas we test. Each piece is one test, so a longer bar means more evidence; grey means the two scored within a point of each other.
- CodingWriting and fixing software60Claude Fable 56 of 6 tests
- ReasoningHard problems that need careful thinking50Claude Fable 55 of 6 tests · 1 tie
- MathCompetition and research-level math30Claude Fable 53 of 3 tests
- Images and chartsUnderstanding pictures, charts and video20Claude Fable 52 of 2 tests
- AgentsCarrying out multi-step tasks on its own21Claude Fable 52 of 3 tests
- FactsGetting facts right instead of making them up21Claude Fable 52 of 3 tests
- Long documentsFinding answers in very long texts10Claude Fable 51 of 1 test
- Following instructionsDoing exactly what it is asked10Claude Fable 51 of 1 test
Long documents and following instructions rest on a single test each.
What it costs
Prices per million tokens, roughly 750,000 words. The bars show the cost of a million tokens read plus a million written.
Grok4.5 costs 87% less for the same work.
The biggest differences
The tests each model wins by the widest margin, up to three each. Scores are out of 100.
Where Claude Fable 5 pulls ahead
- Extremely hard research-level math problemsFrontierMath Tier 4+65.8points ahead
- Abstract visual puzzles that people can solveARC-AGI-2+36.6points ahead
- Complex command-line tasks across many fieldsTerminal-Bench 4.0+31.8points ahead
Where Grok4.5 pulls ahead
- Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+9.5points ahead
- Customer-service tasks in a simulated bankτ-Bench V3 · Banking+4points ahead
Every test, side by side
All 38 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingClaude Fable 5
- LiveBench · CodingClaude Fable 5 by 17.48668.6+17.4
- SWE-bench ProClaude Fable 5 by 15.38064.7+15.3
- LMArena · WebDevClaude Fable 5 by 73 rating points16251552+73 rating
- SciCodeClaude Fable 5 by 66155+6
- LiveBench · Agentic CodingClaude Fable 5 by 5.762.256.5+5.7
- Terminal-Bench 2.1Claude Fable 5 by 384.681.6+3
AgentsClaude Fable 5
- Terminal-Bench 4.0Claude Fable 5 by 31.842.410.6+31.8
- GDPValClaude Fable 5 by 11.155.644.5+11.1
- τ-Bench V3 · BankingGrok4.5 by 438.142.1+4
ReasoningClaude Fable 5
- ARC-AGI-2Claude Fable 5 by 36.689.252.6+36.6
- CritPtClaude Fable 5 by 13.228.615.4+13.2
- Humanity's Last ExamClaude Fable 5 by 12.855.542.7+12.8
- SimpleBenchClaude Fable 5 by 11.981.970+11.9
- LiveBench · ReasoningClaude Fable 5 by 2.589.787.2+2.5
- GPQA Diamondtie92.693.1tie
FactsClaude Fable 5
- SimpleQA VerifiedClaude Fable 5 by 22.470.748.3+22.4
- AA-Omniscience · AccuracyClaude Fable 5 by 13.865.351.5+13.8
- AA-Omniscience · Non-hallucinationGrok4.5 by 9.536.445.9+9.5
Images and chartsClaude Fable 5
- MMMU-ProClaude Fable 5 by 3.884.280.4+3.8
- LMArena · VisionClaude Fable 5 by 37 rating points13251288+37 rating
MathClaude Fable 5
- FrontierMath Tier 4Claude Fable 5 by 65.890.224.4+65.8
- FrontierMath Tiers 1-3 (v2)Claude Fable 5 by 29.88757.2+29.8
- LiveBench · MathematicsClaude Fable 5 by 5.29690.8+5.2
Following instructionsClaude Fable 5
- LiveBench · Instruction FollowingClaude Fable 5 by 4.375.871.5+4.3
Other results13 tests, not counted
Tests outside the eight areas. They are not counted above: several are summary scores built from other tests, or the same test under another name.
- Terminal-Bench 4.0Claude Fable 5 by 32.144.512.4+32.1
- GDPval-AA v2 EloClaude Fable 5 by 188 rating points17231535+188 rating
- AA-OmniscienceClaude Fable 5 by 1843.325.3+18
- DeepSWEClaude Fable 5 by 177053+17
- DeepSWE 1.1Claude Fable 5 by 167054+16
- ARC-AGI-1Claude Fable 5 by 12.898.585.7+12.8
- AA IntelligenceClaude Fable 5 by 10.849.638.8+10.8
- AA Agentic IndexClaude Fable 5 by 8.95142.1+8.9
- livebench_languageClaude Fable 5 by 7.990.782.8+7.9
- livebench_data_analysisClaude Fable 5 by 7.580.573+7.5
- τ³-Bench BankingGrok4.5 by 6.226.833+6.2
- SWE-MarathonClaude Fable 5 by 63529+6
- Artificial Analysis Coding IndexClaude Fable 5 by 4.176.572.4+4.1
Questions people ask
Which is better, Claude Fable 5 or Grok4.5?
Claude Fable 5 wins all eight areas we test: coding, agents, reasoning, facts, images and charts, math, long documents and following instructions. Grok4.5 wins none, but costs 87% less.
Which is better for coding?
Claude Fable 5. It wins 6 of the 6 coding tests both models report; Grok4.5 wins none.
Which is cheaper?
Claude Fable 5 costs $10.00 per million input tokens and $50.00 per million output tokens; Grok4.5 costs $2.00 and $6.00. That makes Grok4.5 about 87% cheaper for the same work.
How do you compare the two?
We use the 38 benchmark tests both models have published scores on. The verdict counts the 25 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 13 are listed but not counted, because several are summary scores or repeat a test. Each score is the one shown on the model's own page.