Claude Fable 5.1 vs GPT-5.6 Sol
Wins 7 of 8 areas
Coding · Agents · Facts · Images and charts · Math · Long documents · Following instructions
Wins 0 of 8 areas
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Claude Fable 5.1 is the stronger all-rounder.GPT-5.6 Sol is cheaper.
Both rank among the ten best models we track in reasoning, coding, agents and math.
Scores updated · 51 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 5.16 of 6 tests
- FactsGetting facts right instead of making them up30Claude Fable 5.13 of 3 tests
- AgentsCarrying out multi-step tasks on its own31Claude Fable 5.13 of 4 tests
- MathCompetition and research-level math20Claude Fable 5.12 of 3 tests · 1 tie
- Images and chartsUnderstanding pictures, charts and video10Claude Fable 5.11 of 1 test
- Long documentsFinding answers in very long texts10Claude Fable 5.11 of 1 test
- Following instructionsDoing exactly what it is asked10Claude Fable 5.11 of 1 test
- ReasoningHard problems that need careful thinking22Even2 each · 2 ties
Images and charts, 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.
GPT-5.6 Sol costs 60% less for the same work.
The biggest differences
The three tests each model wins by the widest margin. Scores are out of 100.
Where Claude Fable 5.1 pulls ahead
- Common-sense trick questionsSimpleBench+21.8points ahead
- Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+19.6points ahead
- Long, multi-file coding tasks in real codebasesSWE-bench Pro+16.6points ahead
Where GPT-5.6 Sol pulls ahead
- Finds the root cause of IT system incidentsAA IT-Bench SRE+6.7points ahead
- Research-level physics problemsCritPt+2.6points ahead
- Abstract visual puzzles that people can solveARC-AGI-2+2.5points ahead
Every test, side by side
All 51 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingClaude Fable 5.1
- SWE-bench ProClaude Fable 5.1 by 16.681.264.6+16.6
- LMArena · WebDevClaude Fable 5.1 by 126 rating points17431617+126 rating
- LiveBench · Agentic CodingClaude Fable 5.1 by 9.966.156.2+9.9
- SciCodeClaude Fable 5.1 by 663.157.1+6
- Terminal-Bench 2.1Claude Fable 5.1 by 3.491.488+3.4
- LiveBench · CodingClaude Fable 5.1 by 2.586.483.9+2.5
AgentsClaude Fable 5.1
- Terminal-Bench 4.0Claude Fable 5.1 by 12.15239.9+12.1
- GDPValClaude Fable 5.1 by 7.362.755.4+7.3
- AA IT-Bench SREGPT-5.6 Sol by 6.749.556.2+6.7
- τ-Bench V3 · BankingClaude Fable 5.1 by 2.947.244.3+2.9
ReasoningEven
- SimpleBenchClaude Fable 5.1 by 21.886.664.8+21.8
- Humanity's Last ExamClaude Fable 5.1 by 9.659.149.5+9.6
- CritPtGPT-5.6 Sol by 2.629.732.3+2.6
- ARC-AGI-2GPT-5.6 Sol by 2.59092.5+2.5
- GPQA Diamondtie93.794.1tie
- LiveBench · Reasoningtie91.791.7tie
FactsClaude Fable 5.1
- AA-Omniscience · Non-hallucinationClaude Fable 5.1 by 19.627.47.8+19.6
- AA-Omniscience · AccuracyClaude Fable 5.1 by 7.867.259.4+7.8
- SimpleQA VerifiedClaude Fable 5.1 by 1.170.869.7+1.1
Images and chartsClaude Fable 5.1
- LMArena · VisionClaude Fable 5.1 by 37 rating points13181281+37 rating
MathClaude Fable 5.1
- FrontierMath Tier 4Claude Fable 5.1 by 4.887.883+4.8
- FrontierMath Tiers 1-3 (v2)Claude Fable 5.1 by 1.190.289.1+1.1
- LiveBench · Mathematicstie9796.2tie
Following instructionsClaude Fable 5.1
- LiveBench · Instruction FollowingClaude Fable 5.1 by 1.17371.8+1.1
Other results26 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.
- Program BenchClaude Fable 5.1 by 62.687.625+62.6
- GDP (Surge AI)Claude Fable 5.1 by 54.485.130.7+54.4
- Terminal-Bench-Science 0.1Claude Fable 5.1 by 30.252.622.4+30.2
- HiL-Bench (Tools-allowed)Claude Fable 5.1 by 29.261.532.3+29.2
- AA-OmniscienceClaude Fable 5.1 by 21.543.522+21.5
- Terminal-Bench 4.0Claude Fable 5.1 by 18.555.837.3+18.5
- OSWorld 2.0Claude Fable 5.1 by 15.377.962.6+15.3
- OSWorld 2.0 (partial)Claude Fable 5.1 by 15.377.962.6+15.3
- GDPval-AA 2.1Claude Fable 5.1 by 147 rating points17351588+147 rating
- GDPval-AA v2Claude Fable 5.1 by 142 rating points18531711+142 rating
- GDPval-AA v2 EloClaude Fable 5.1 by 125 rating points18351710+125 rating
- AA Agentic IndexClaude Fable 5.1 by 7.55850.5+7.5
- AA IntelligenceClaude Fable 5.1 by 6.453.447+6.4
- OfficeQA ProClaude Fable 5.1 by 5.86963.2+5.8
- DeepSWE 1.1GPT-5.6 Sol by 5.667.473+5.6
- Artificial Analysis Coding IndexClaude Fable 5.1 by 4.281.677.4+4.2
- PostTrainBenchClaude Fable 5.1 by 440.236.2+4
- HealthBench length-adjustedClaude Fable 5.1 by 36057+3
- Toolathlon VerifiedClaude Fable 5.1 by 2.977.874.9+2.9
- LVBenchGPT-5.6 Sol by 2.479.782.1+2.4
- livebench_languageClaude Fable 5.1 by 1.889.587.7+1.8
- HealthBench ProfessionalClaude Fable 5.1 by 1.662.160.5+1.6
- HealthBench Professional length-adjustedClaude Fable 5.1 by 1.662.160.5+1.6
- ARC-AGI-1Claude Fable 5.1 by 197.596.5+1
- HLE (with tools)tie6564.5tie
- livebench_data_analysistie80.379.8tie
Questions people ask
Which is better, Claude Fable 5.1 or GPT-5.6 Sol?
Claude Fable 5.1 wins seven of the eight areas we test: coding, agents, facts, images and charts, math, long documents and following instructions. GPT-5.6 Sol wins none, but costs 60% less. They are level on reasoning.
Which is better for coding?
Claude Fable 5.1. It wins 6 of the 6 coding tests both models report; GPT-5.6 Sol wins none.
Which is cheaper?
Claude Fable 5.1 costs $10.00 per million input tokens and $50.00 per million output tokens; GPT-5.6 Sol costs $4.00 and $20.00. That makes GPT-5.6 Sol about 60% cheaper for the same work.
How do you compare the two?
We use the 51 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 26 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.