Claude Fable 5.1 vs GPT-6.1 Sol
Wins 3 of 8 areas
Coding · Images and charts · Long documents
Wins 3 of 8 areas
Facts · Math · Following instructions
The two are evenly matched.Claude Fable 5.1 is better at coding and images and charts; GPT-6.1 Sol at math and facts.
Both rank among the ten best models we track in reasoning, facts and math.
Scores updated · 34 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 software30Claude Fable 5.13 of 4 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
- MathCompetition and research-level math02GPT-6.1 Sol2 of 3 tests · 1 tie
- FactsGetting facts right instead of making them up12GPT-6.1 Sol2 of 3 tests
- Following instructionsDoing exactly what it is asked01GPT-6.1 Sol1 of 1 test
- AgentsCarrying out multi-step tasks on its own11Even1 each
- ReasoningHard problems that need careful thinking22Even2 each · 1 tie
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-6.1 Sol costs 80% 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
- Fixes real GitHub issues, working as an agentLiveBench · Agentic Coding+11.5points ahead
- Code for real scientific research problemsSciCode+8.9points ahead
- Real work tasks from 44 professionsGDPVal+8points ahead
Where GPT-6.1 Sol pulls ahead
- Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+18.3points ahead
- Extremely hard research-level math problemsFrontierMath Tier 4+12.2points ahead
- Abstract visual puzzles that people can solveARC-AGI-2+4.2points ahead
Every test, side by side
All 34 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingClaude Fable 5.1
- LiveBench · Agentic CodingClaude Fable 5.1 by 11.566.154.5+11.5
- SciCodeClaude Fable 5.1 by 8.963.154.2+8.9
- LiveBench · CodingClaude Fable 5.1 by 686.480.4+6
- LMArena · WebDevtie17421749tie
AgentsEven
- GDPValClaude Fable 5.1 by 862.754.7+8
- Terminal-Bench 4.0GPT-6.1 Sol by 4.15256.1+4.1
ReasoningEven
- Humanity's Last ExamClaude Fable 5.1 by 6.259.152.9+6.2
- ARC-AGI-2GPT-6.1 Sol by 4.29094.2+4.2
- SimpleBenchClaude Fable 5.1 by 3.786.682.9+3.7
- CritPtGPT-6.1 Sol by 229.731.7+2
- LiveBench · Reasoningtie91.792.6tie
FactsGPT-6.1 Sol
- AA-Omniscience · Non-hallucinationGPT-6.1 Sol by 18.327.445.7+18.3
- AA-Omniscience · AccuracyClaude Fable 5.1 by 5.167.262.1+5.1
- SimpleQA VerifiedGPT-6.1 Sol by 3.170.873.9+3.1
Images and chartsClaude Fable 5.1
- LMArena · VisionClaude Fable 5.1 by 31 rating points13191288+31 rating
MathGPT-6.1 Sol
- FrontierMath Tier 4GPT-6.1 Sol by 12.287.8100+12.2
- FrontierMath Tiers 1-3 (v2)GPT-6.1 Sol by 3.590.293.7+3.5
- LiveBench · Mathematicstie9796.8tie
Following instructionsGPT-6.1 Sol
- LiveBench · Instruction FollowingGPT-6.1 Sol by 1.27374.2+1.2
Other results14 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.
- GDP (Surge AI)Claude Fable 5.1 by 53.185.132+53.1
- HealthBenchClaude Fable 5.1 by 8.266.758.5+8.2
- DeepSWE 1.1GPT-6.1 Sol by 7.867.475.2+7.8
- OSWorld 2.0Claude Fable 5.1 by 6.577.971.4+6.5
- Terminal-Bench-Science 0.1GPT-6.1 Sol by 4.452.657+4.4
- livebench_data_analysisGPT-6.1 Sol by 2.480.382.7+2.4
- Terminal-Bench 4.0GPT-6.1 Sol by 2.455.858.2+2.4
- HealthBench ProfessionalGPT-6.1 Sol by 2.162.164.2+2.1
- HealthBench Professional length-adjustedGPT-6.1 Sol by 2.162.164.2+2.1
- AA-OmniscienceClaude Fable 5.1 by 243.541.5+2
- AA IntelligenceClaude Fable 5.1 by 1.653.451.8+1.6
- ARC-AGI-1Claude Fable 5.1 by 197.596.5+1
- HiL-Bench (Tools-allowed)tie61.562.3tie
- livebench_languagetie89.590.1tie
Questions people ask
Which is better, Claude Fable 5.1 or GPT-6.1 Sol?
Claude Fable 5.1 and GPT-6.1 Sol each win three of the eight areas we test. Claude Fable 5.1 wins coding, images and charts and long documents; GPT-6.1 Sol wins facts, math and following instructions. GPT-6.1 Sol costs 80% less. They are level on agents and reasoning.
Which is better for coding?
Claude Fable 5.1. It wins 3 of the 4 coding tests both models report; GPT-6.1 Sol wins none, and 1 is a tie.
Which is cheaper?
Claude Fable 5.1 costs $10.00 per million input tokens and $50.00 per million output tokens; GPT-6.1 Sol costs $2.00 and $10.00. That makes GPT-6.1 Sol about 80% cheaper for the same work.
How do you compare the two?
We use the 34 benchmark tests both models have published scores on. The verdict counts the 20 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 14 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.