Gemini 3.1 Pro vs GPT-5.6 Sol
Wins 2 of 8 areas
Facts · Following instructions
Wins 6 of 8 areas
Coding · Agents · Reasoning · Images and charts · Math · Long documents
GPT-5.6 Sol is the stronger all-rounder.Gemini 3.1 Pro is cheaper and better at facts.
Scores updated · 68 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.
- AgentsCarrying out multi-step tasks on its own08GPT-5.6 Sol8 of 8 tests
- CodingWriting and fixing software16GPT-5.6 Sol6 of 7 tests
- ReasoningHard problems that need careful thinking15GPT-5.6 Sol5 of 7 tests · 1 tie
- MathCompetition and research-level math04GPT-5.6 Sol4 of 4 tests
- Images and chartsUnderstanding pictures, charts and video12GPT-5.6 Sol2 of 3 tests
- Long documentsFinding answers in very long texts01GPT-5.6 Sol1 of 1 test
- FactsGetting facts right instead of making them up31Gemini 3.1 Pro3 of 4 tests
- Following instructionsDoing exactly what it is asked20Gemini 3.1 Pro2 of 2 tests
Long documents rests on a single test.
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 42% less for the same work.
The biggest differences
The three tests each model wins by the widest margin. Scores are out of 100.
Where GPT-5.6 Sol pulls ahead
- Extremely hard research-level math problemsFrontierMath Tier 4+56.2points ahead
- Real work tasks from 44 professionsGDPVal+40.9points ahead
- Complex command-line tasks across many fieldsTerminal-Bench 4.0+35.9points ahead
Where Gemini 3.1 Pro pulls ahead
- Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+41.3points ahead
- Common-sense trick questionsSimpleBench+14.8points ahead
- Follows detailed instructions exactlyLiveBench · Instruction Following+7.2points ahead
Every test, side by side
All 68 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingGPT-5.6 Sol
- LMArena · WebDevGPT-5.6 Sol by 174 rating points14461620+174 rating
- Terminal-Bench 2.1GPT-5.6 Sol by 14.273.888+14.2
- LiveBench · Agentic CodingGPT-5.6 Sol by 12.144.156.2+12.1
- Terminal-Bench HardGPT-5.6 Sol by 12.153.865.9+12.1
- SWE-bench ProGPT-5.6 Sol by 10.454.264.6+10.4
- LiveBench · CodingGPT-5.6 Sol by 7.476.583.9+7.4
- SciCodeGemini 3.1 Pro by 1.658.757.1+1.6
AgentsGPT-5.6 Sol
- GDPValGPT-5.6 Sol by 40.914.755.6+40.9
- Terminal-Bench 4.0GPT-5.6 Sol by 35.9439.9+35.9
- AA IT-Bench SREGPT-5.6 Sol by 25.930.356.2+25.9
- τ-Bench V3 · BankingGPT-5.6 Sol by 22.921.444.3+22.9
- MCP AtlasGPT-5.6 Sol by 14.469.283.6+14.4
- AA ApexAgentsGPT-5.6 Sol by 7.93239.9+7.9
- OSWorld-VerifiedGPT-5.6 Sol by 6.876.283+6.8
- BrowseCompGPT-5.6 Sol by 4.585.990.4+4.5
ReasoningGPT-5.6 Sol
- ARC-AGI-2GPT-5.6 Sol by 15.477.192.5+15.4
- SimpleBenchGemini 3.1 Pro by 14.879.664.8+14.8
- CritPtGPT-5.6 Sol by 14.617.732.3+14.6
- LiveBench · ReasoningGPT-5.6 Sol by 7.78491.7+7.7
- ARC-AGI-3GPT-5.6 Sol by 7.40.47.8+7.4
- Humanity's Last ExamGPT-5.6 Sol by 2.54749.5+2.5
- GPQA Diamondtie94.194.1tie
FactsGemini 3.1 Pro
- AA-Omniscience · Non-hallucinationGemini 3.1 Pro by 41.349.17.8+41.3
- AA-Omniscience · AccuracyGPT-5.6 Sol by 4.554.959.4+4.5
- SimpleQA VerifiedGemini 3.1 Pro by 3.873.569.7+3.8
- Vectara HHEM hallucination ratelower is betterGemini 3.1 Pro by 210.412.4+2
Images and chartsGPT-5.6 Sol
- CharXiv (RQ)GPT-5.6 Sol by 2.583.385.8+2.5
- LMArena · VisionGemini 3.1 Pro by 17 rating points12961279+17 rating
- MMMU-ProGPT-5.6 Sol by 182.483.4+1
MathGPT-5.6 Sol
- FrontierMath Tier 4GPT-5.6 Sol by 56.226.883+56.2
- FrontierMath Tiers 1-3 (v2)GPT-5.6 Sol by 29.459.689.1+29.4
- LiveBench · MathematicsGPT-5.6 Sol by 5.29196.2+5.2
- AIME 2026GPT-5.6 Sol by 1.698.399.9+1.6
Following instructionsGemini 3.1 Pro
- LiveBench · Instruction FollowingGemini 3.1 Pro by 7.279.171.8+7.2
- IFBenchGemini 3.1 Pro by 4.477.172.7+4.4
Other results32 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 v2GPT-5.6 Sol by 749 rating points9621711+749 rating
- GDPval-AA v2 EloGPT-5.6 Sol by 745 rating points9651710+745 rating
- DeepSWEGPT-5.6 Sol by 62.71072.7+62.7
- DeepSWE 1.1GPT-5.6 Sol by 611273+61
- CyberGymGPT-5.6 Sol by 45.738.884.5+45.7
- AA Agentic IndexGPT-5.6 Sol by 40.210.350.5+40.2
- SWE-MarathonGPT-5.6 Sol by 38.5442.5+38.5
- AA IntelligenceGPT-5.6 Sol by 17.329.747+17.3
- τ³-Bench BankingGPT-5.6 Sol by 16.516.533+16.5
- LVBenchGPT-5.6 Sol by 15.966.282.1+15.9
- PostTrainBenchGPT-5.6 Sol by 14.621.636.2+14.6
- Program BenchGemini 3.1 Pro by 14.539.525+14.5
- GDP (Surge AI)GPT-5.6 Sol by 1416.730.7+14
- HLE (with tools)GPT-5.6 Sol by 13.151.464.5+13.1
- τ²-Bench Telecom (AA run)Gemini 3.1 Pro by 10.595.685.1+10.5
- SWEBench Pro PublicGPT-5.6 Sol by 10.454.264.6+10.4
- AA-OmniscienceGemini 3.1 Pro by 9.931.922+9.9
- OfficeQA ProGemini 3.1 Pro by 9.372.563.2+9.3
- ToolathlonGPT-5.6 Sol by 9.248.858+9.2
- Artificial Analysis Coding IndexGPT-5.6 Sol by 8.668.877.4+8.6
- BrowseComp (w/ Ctx)GPT-5.6 Sol by 3.585.989.4+3.5
- HiL-Bench (Tools-allowed)Gemini 3.1 Pro by 335.332.3+3
- vectara_avg_summary_lengthGPT-5.6 Sol by 23.4 rating points107.7131.1+23.4 rating
- livebench_languageGPT-5.6 Sol by 2.385.487.7+2.3
- charxiv_rq_with_pythonGemini 3.1 Pro by 2.189.987.8+2.1
- vectara_factual_consistencyGemini 3.1 Pro by 289.687.6+2
- ARC-AGI-1Gemini 3.1 Pro by 1.59896.5+1.5
- ProteinGym HardGemini 3.1 Pro by 1.53735.5+1.5
- livebench_data_analysisGPT-5.6 Sol by 1.378.579.8+1.3
- Global-MMLU-Litetie92.791.8tie
- StrongREJECTtie9898.5tie
- vectara_answer_ratetie99.499.1tie
Questions people ask
Which is better, Gemini 3.1 Pro or GPT-5.6 Sol?
GPT-5.6 Sol 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 42% less.
Which is better for coding?
GPT-5.6 Sol. It wins 6 of the 7 coding tests both models report; Gemini 3.1 Pro wins 1.
Which is cheaper?
Gemini 3.1 Pro costs $2.00 per million input tokens and $12.00 per million output tokens; GPT-5.6 Sol costs $4.00 and $20.00. That makes Gemini 3.1 Pro about 42% cheaper for the same work.
How do you compare the two?
We use the 68 benchmark tests both models have published scores on. The verdict counts the 36 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 32 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.