Gemini 3.5 Flash vs GPT-6.1 Sol
Wins 1 of 8 areas
Following instructions
Wins 6 of 8 areas
Coding · Agents · Reasoning · Facts · Math · Long documents
GPT-6.1 Sol is the stronger all-rounder.Gemini 3.5 Flash is cheaper and better at following instructions.
Scores updated · 29 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.
- ReasoningHard problems that need careful thinking05GPT-6.1 Sol5 of 5 tests
- CodingWriting and fixing software03GPT-6.1 Sol3 of 4 tests · 1 tie
- AgentsCarrying out multi-step tasks on its own03GPT-6.1 Sol3 of 3 tests
- FactsGetting facts right instead of making them up03GPT-6.1 Sol3 of 3 tests
- MathCompetition and research-level math03GPT-6.1 Sol3 of 3 tests
- Long documentsFinding answers in very long texts01GPT-6.1 Sol1 of 1 test
- Following instructionsDoing exactly what it is asked10Gemini 3.5 Flash1 of 1 test
- Images and chartsUnderstanding pictures, charts and video11Even1 each
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 3.5 Flash costs 13% 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-6.1 Sol pulls ahead
- Extremely hard research-level math problemsFrontierMath Tier 4+73.2points ahead
- Complex command-line tasks across many fieldsTerminal-Bench 4.0+49.5points ahead
- Unpublished advanced math problemsFrontierMath Tiers 1-3 (v2)+30.9points ahead
Where Gemini 3.5 Flash pulls ahead
- Follows detailed instructions exactlyLiveBench · Instruction Following+1.4points ahead
Every test, side by side
All 29 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingGPT-6.1 Sol
- LMArena · WebDevGPT-6.1 Sol by 250 rating points14991749+250 rating
- LiveBench · Agentic CodingGPT-6.1 Sol by 5.64954.5+5.6
- LiveBench · CodingGPT-6.1 Sol by 2.278.280.4+2.2
- SciCodetie53.954.2tie
AgentsGPT-6.1 Sol
- Terminal-Bench 4.0GPT-6.1 Sol by 49.56.656.1+49.5
- GDPValGPT-6.1 Sol by 19.635.154.7+19.6
- AA ApexAgentsGPT-6.1 Sol by 12.947.160+12.9
ReasoningGPT-6.1 Sol
- ARC-AGI-2GPT-6.1 Sol by 22.172.194.2+22.1
- CritPtGPT-6.1 Sol by 18.613.131.7+18.6
- LiveBench · ReasoningGPT-6.1 Sol by 10.68292.6+10.6
- Humanity's Last ExamGPT-6.1 Sol by 10.242.752.9+10.2
- SimpleBenchGPT-6.1 Sol by 6.276.782.9+6.2
FactsGPT-6.1 Sol
- AA-Omniscience · AccuracyGPT-6.1 Sol by 10.751.462.1+10.7
- AA-Omniscience · Non-hallucinationGPT-6.1 Sol by 7.937.845.7+7.9
- SimpleQA VerifiedGPT-6.1 Sol by 7.766.273.9+7.7
Images and chartsEven
- LMArena · VisionGemini 3.5 Flash by 20 rating points13081288+20 rating
- MMMU-ProGPT-6.1 Sol by 1.784.386+1.7
MathGPT-6.1 Sol
- FrontierMath Tier 4GPT-6.1 Sol by 73.226.8100+73.2
- FrontierMath Tiers 1-3 (v2)GPT-6.1 Sol by 30.962.893.7+30.9
- LiveBench · MathematicsGPT-6.1 Sol by 8.688.296.8+8.6
Following instructionsGemini 3.5 Flash
- LiveBench · Instruction FollowingGemini 3.5 Flash by 1.475.674.2+1.4
Other results7 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.
- DeepSWE 1.1GPT-6.1 Sol by 38.23775.2+38.2
- HiL-Bench (Tools-allowed)GPT-6.1 Sol by 34.627.762.3+34.6
- AA-OmniscienceGPT-6.1 Sol by 20.321.241.5+20.3
- AA IntelligenceGPT-6.1 Sol by 19.232.651.8+19.2
- livebench_data_analysisGPT-6.1 Sol by 17.864.982.7+17.8
- livebench_languageGPT-6.1 Sol by 5.584.690.1+5.5
- ARC-AGI-1GPT-6.1 Sol by 492.596.5+4
Questions people ask
Which is better, Gemini 3.5 Flash or GPT-6.1 Sol?
GPT-6.1 Sol wins six of the eight areas we test: coding, agents, reasoning, facts, math and long documents. Gemini 3.5 Flash wins following instructions, and costs 13% less. They are level on images and charts.
Which is better for coding?
GPT-6.1 Sol. It wins 3 of the 4 coding tests both models report; Gemini 3.5 Flash wins none, and 1 is a tie.
Which is cheaper?
Gemini 3.5 Flash costs $1.50 per million input tokens and $9.00 per million output tokens; GPT-6.1 Sol costs $2.00 and $10.00. That makes Gemini 3.5 Flash about 13% cheaper for the same work.
How do you compare the two?
We use the 29 benchmark tests both models have published scores on. The verdict counts the 22 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 7 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.