Claude Fable 5.1 vs Gemini 3.1 Pro
Wins 6 of 8 areas
Coding · Agents · Reasoning · Images and charts · Math · Long documents
Wins 2 of 8 areas
Facts · Following instructions
Claude Fable 5.1 is the stronger all-rounder.Gemini 3.1 Pro is cheaper and better at facts.
Both rank among the ten best models we track in facts.
Scores updated · 44 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 software70Claude Fable 5.17 of 7 tests
- ReasoningHard problems that need careful thinking50Claude Fable 5.15 of 6 tests · 1 tie
- AgentsCarrying out multi-step tasks on its own40Claude Fable 5.14 of 4 tests
- MathCompetition and research-level math30Claude Fable 5.13 of 3 tests
- 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
- FactsGetting facts right instead of making them up12Gemini 3.1 Pro2 of 3 tests
- Following instructionsDoing exactly what it is asked01Gemini 3.1 Pro1 of 1 test
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.
Gemini 3.1 Pro costs 77% 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
- Extremely hard research-level math problemsFrontierMath Tier 4+61points ahead
- Real work tasks from 44 professionsGDPVal+48.1points ahead
- Complex command-line tasks across many fieldsTerminal-Bench 4.0+48points ahead
Where Gemini 3.1 Pro pulls ahead
- Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+21.7points ahead
- Follows detailed instructions exactlyLiveBench · Instruction Following+6.1points ahead
- Short factual questions, answered correctlySimpleQA Verified+2.7points ahead
Every test, side by side
All 44 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingClaude Fable 5.1
- LMArena · WebDevClaude Fable 5.1 by 296 rating points17431447+296 rating
- SWE-bench ProClaude Fable 5.1 by 2781.254.2+27
- LiveBench · Agentic CodingClaude Fable 5.1 by 2266.144.1+22
- Terminal-Bench 2.1Claude Fable 5.1 by 17.691.473.8+17.6
- SWE-bench MultilingualClaude Fable 5.1 by 12.289.176.9+12.2
- LiveBench · CodingClaude Fable 5.1 by 9.986.476.5+9.9
- SciCodeClaude Fable 5.1 by 4.463.158.7+4.4
AgentsClaude Fable 5.1
- GDPValClaude Fable 5.1 by 48.162.714.6+48.1
- Terminal-Bench 4.0Claude Fable 5.1 by 48524+48
- τ-Bench V3 · BankingClaude Fable 5.1 by 25.847.221.4+25.8
- AA IT-Bench SREClaude Fable 5.1 by 19.249.530.3+19.2
ReasoningClaude Fable 5.1
- ARC-AGI-2Claude Fable 5.1 by 12.99077.1+12.9
- Humanity's Last ExamClaude Fable 5.1 by 12.159.147+12.1
- CritPtClaude Fable 5.1 by 1229.717.7+12
- LiveBench · ReasoningClaude Fable 5.1 by 7.791.784+7.7
- SimpleBenchClaude Fable 5.1 by 786.679.6+7
- GPQA Diamondtie93.794.1tie
FactsGemini 3.1 Pro
- AA-Omniscience · Non-hallucinationGemini 3.1 Pro by 21.727.449.1+21.7
- AA-Omniscience · AccuracyClaude Fable 5.1 by 12.367.254.9+12.3
- SimpleQA VerifiedGemini 3.1 Pro by 2.770.873.5+2.7
Images and chartsClaude Fable 5.1
- LMArena · VisionClaude Fable 5.1 by 23 rating points13191296+23 rating
MathClaude Fable 5.1
- FrontierMath Tier 4Claude Fable 5.1 by 6187.826.8+61
- FrontierMath Tiers 1-3 (v2)Claude Fable 5.1 by 30.590.259.6+30.5
- LiveBench · MathematicsClaude Fable 5.1 by 69791+6
Following instructionsGemini 3.1 Pro
- LiveBench · Instruction FollowingGemini 3.1 Pro by 6.17379.1+6.1
Other results18 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.
- GDPval-AA v2Claude Fable 5.1 by 891 rating points1853962+891 rating
- GDPval-AA v2 EloClaude Fable 5.1 by 870 rating points1835965+870 rating
- GDP (Surge AI)Claude Fable 5.1 by 68.485.116.7+68.4
- DeepSWE 1.1Claude Fable 5.1 by 55.467.412+55.4
- Program BenchClaude Fable 5.1 by 48.187.639.5+48.1
- AA Agentic IndexClaude Fable 5.1 by 47.75810.3+47.7
- GDPval-AA (Elo)Claude Fable 5.1 by 418 rating points17351317+418 rating
- HiL-Bench (Tools-allowed)Claude Fable 5.1 by 26.261.535.3+26.2
- AA IntelligenceClaude Fable 5.1 by 23.753.429.7+23.7
- PostTrainBenchClaude Fable 5.1 by 18.640.221.6+18.6
- HLE (with tools)Claude Fable 5.1 by 14.265.651.4+14.2
- LVBenchClaude Fable 5.1 by 13.579.766.2+13.5
- Artificial Analysis Coding IndexClaude Fable 5.1 by 12.881.668.8+12.8
- AA-OmniscienceClaude Fable 5.1 by 11.643.531.9+11.6
- livebench_languageClaude Fable 5.1 by 4.189.585.4+4.1
- OfficeQA ProGemini 3.1 Pro by 3.56972.5+3.5
- livebench_data_analysisClaude Fable 5.1 by 1.880.378.5+1.8
- ARC-AGI-1tie97.598tie
Questions people ask
Which is better, Claude Fable 5.1 or Gemini 3.1 Pro?
Claude Fable 5.1 wins six of the eight areas we test: coding, agents, reasoning, images and charts, math and long documents. Gemini 3.1 Pro wins facts and following instructions, and costs 77% less.
Which is better for coding?
Claude Fable 5.1. It wins 7 of the 7 coding tests both models report; Gemini 3.1 Pro wins none.
Which is cheaper?
Claude Fable 5.1 costs $10.00 per million input tokens and $50.00 per million output tokens; Gemini 3.1 Pro costs $2.00 and $12.00. That makes Gemini 3.1 Pro about 77% cheaper for the same work.
How do you compare the two?
We use the 44 benchmark tests both models have published scores on. The verdict counts the 26 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 18 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.