Gemini 3 Pro vs GPT-5.6 Sol
Wins 0 of 8 areas
—
Wins 8 of 8 areas
Coding · Agents · Reasoning · Facts · Images and charts · Math · Long documents · Following instructions
GPT-5.6 Sol is the stronger all-rounder.Gemini 3 Pro is cheaper.
Scores updated · 36 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 software04GPT-5.6 Sol4 of 4 tests
- AgentsCarrying out multi-step tasks on its own04GPT-5.6 Sol4 of 4 tests
- ReasoningHard problems that need careful thinking14GPT-5.6 Sol4 of 5 tests
- FactsGetting facts right instead of making them up12GPT-5.6 Sol2 of 4 tests · 1 tie
- Images and chartsUnderstanding pictures, charts and video12GPT-5.6 Sol2 of 3 tests
- MathCompetition and research-level math01GPT-5.6 Sol1 of 1 test
- Long documentsFinding answers in very long texts01GPT-5.6 Sol1 of 1 test
- Following instructionsDoing exactly what it is asked01GPT-5.6 Sol1 of 1 test
Math, 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 Pro costs 42% 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 GPT-5.6 Sol pulls ahead
- Abstract visual puzzles that people can solveARC-AGI-2+61.4points ahead
- Finds hard-to-locate facts by browsing the webBrowseComp+31.2points ahead
- Multi-step tasks using many real software toolsMCP Atlas+29.5points ahead
Where Gemini 3 Pro pulls ahead
- Common-sense trick questionsSimpleBench+11.6points ahead
- Short factual questions, answered correctlySimpleQA Verified+3.2points ahead
Every test, side by side
All 36 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingGPT-5.6 Sol
- Terminal-Bench HardGPT-5.6 Sol by 24.241.765.9+24.2
- SWE-bench ProGPT-5.6 Sol by 21.343.364.6+21.3
- LMArena · WebDevGPT-5.6 Sol by 178 rating points14401618+178 rating
- SciCodeGPT-5.6 Sol by 156.157.1+1
AgentsGPT-5.6 Sol
- BrowseCompGPT-5.6 Sol by 31.259.290.4+31.2
- MCP AtlasGPT-5.6 Sol by 29.554.183.6+29.5
- AA ApexAgentsGPT-5.6 Sol by 21.518.439.9+21.5
- GDPValGPT-5.6 Sol by 21.434.255.6+21.4
ReasoningGPT-5.6 Sol
- ARC-AGI-2GPT-5.6 Sol by 61.431.192.5+61.4
- CritPtGPT-5.6 Sol by 23.29.132.3+23.2
- SimpleBenchGemini 3 Pro by 11.676.464.8+11.6
- Humanity's Last ExamGPT-5.6 Sol by 9.839.749.5+9.8
- GPQA DiamondGPT-5.6 Sol by 3.390.894.1+3.3
FactsGPT-5.6 Sol
- AA-Omniscience · AccuracyGPT-5.6 Sol by 3.655.859.4+3.6
- SimpleQA VerifiedGemini 3 Pro by 3.272.969.7+3.2
- Vectara HHEM hallucination ratelower is betterGPT-5.6 Sol by 1.213.612.4+1.2
- AA-Omniscience · Non-hallucinationtie8.57.8tie
Images and chartsGPT-5.6 Sol
- CharXiv (RQ)GPT-5.6 Sol by 4.481.485.8+4.4
- MMMU-ProGPT-5.6 Sol by 3.280.283.4+3.2
- LMArena · VisionGemini 3 Pro by 26 rating points13051279+26 rating
Following instructionsGPT-5.6 Sol
- IFBenchGPT-5.6 Sol by 2.370.472.7+2.3
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.
- MathArena Apex (Pass@1)GPT-5.6 Sol by 42.223.465.6+42.2
- Artificial Analysis Coding IndexGPT-5.6 Sol by 30.946.577.4+30.9
- ToolathlonGPT-5.6 Sol by 21.636.458+21.6
- ARC-AGI-1GPT-5.6 Sol by 21.57596.5+21.5
- AA IntelligenceGPT-5.6 Sol by 192847+19
- HLE (with tools)GPT-5.6 Sol by 18.745.864.5+18.7
- LVBenchGPT-5.6 Sol by 8.673.582.1+8.6
- AA-OmniscienceGPT-5.6 Sol by 6.715.322+6.7
- vectara_avg_summary_lengthGPT-5.6 Sol by 29.2 rating points101.9131.1+29.2 rating
- τ²-Bench Telecom (AA run)Gemini 3 Pro by 287.185.1+2
- AA Agentic IndexGemini 3 Pro by 1.55250.5+1.5
- vectara_factual_consistencyGPT-5.6 Sol by 1.286.487.6+1.2
- vectara_answer_ratetie99.499.1tie
Questions people ask
Which is better, Gemini 3 Pro or GPT-5.6 Sol?
GPT-5.6 Sol wins all eight areas we test: coding, agents, reasoning, facts, images and charts, math, long documents and following instructions. Gemini 3 Pro wins none, but costs 42% less.
Which is better for coding?
GPT-5.6 Sol. It wins 4 of the 4 coding tests both models report; Gemini 3 Pro wins none.
Which is cheaper?
Gemini 3 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 Pro about 42% cheaper for the same work.
How do you compare the two?
We use the 36 benchmark tests both models have published scores on. The verdict counts the 23 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.