DeepSeek-V4.1-Flash vs GPT-5.6 Sol
Wins 0 of 8 areas
—
Wins 6 of 8 areas
Agents · Reasoning · Facts · Images and charts · Math · Following instructions
GPT-5.6 Sol is the stronger all-rounder.DeepSeek-V4.1-Flash is cheaper.
Scores updated · 48 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 thinking16GPT-5.6 Sol6 of 7 tests
- FactsGetting facts right instead of making them up03GPT-5.6 Sol3 of 3 tests
- MathCompetition and research-level math03GPT-5.6 Sol3 of 3 tests
- AgentsCarrying out multi-step tasks on its own02GPT-5.6 Sol2 of 3 tests · 1 tie
- Images and chartsUnderstanding pictures, charts and video02GPT-5.6 Sol2 of 3 tests · 1 tie
- Following instructionsDoing exactly what it is asked01GPT-5.6 Sol1 of 1 test
- CodingWriting and fixing software22Even2 each · 1 tie
- Long documentsFinding answers in very long texts00Even0 each · 1 tie
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.
DeepSeek-V4.1-Flash costs 94% 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+36.7points ahead
- Short factual questions, answered correctlySimpleQA Verified+26.8points ahead
- Research-level physics problemsCritPt+18points ahead
Where DeepSeek-V4.1-Flash pulls ahead
- Fixes real GitHub issues, working as an agentLiveBench · Agentic Coding+21.1points ahead
- Command-line tasks in a real terminalTerminal-Bench 2.1+2.6points ahead
- Common-sense trick questionsSimpleBench+1.9points ahead
Every test, side by side
All 48 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingEven
- LiveBench · Agentic CodingDeepSeek-V4.1-Flash by 21.177.356.2+21.1
- SciCodeGPT-5.6 Sol by 5.251.957.1+5.2
- LiveBench · CodingGPT-5.6 Sol by 3.98083.9+3.9
- Terminal-Bench 2.1DeepSeek-V4.1-Flash by 2.690.688+2.6
- LMArena · WebDevtie16191616tie
AgentsGPT-5.6 Sol
- Terminal-Bench 4.0GPT-5.6 Sol by 13.126.839.9+13.1
- AA IT-Bench SREGPT-5.6 Sol by 9.346.956.2+9.3
- GDPValtie5555.4tie
ReasoningGPT-5.6 Sol
- CritPtGPT-5.6 Sol by 1814.332.3+18
- ARC-AGI-2GPT-5.6 Sol by 14.478.192.5+14.4
- Humanity's Last ExamGPT-5.6 Sol by 10.339.249.5+10.3
- ARC-AGI-3GPT-5.6 Sol by 6.90.97.8+6.9
- LiveBench · ReasoningGPT-5.6 Sol by 586.791.7+5
- GPQA DiamondGPT-5.6 Sol by 3.290.994.1+3.2
- SimpleBenchDeepSeek-V4.1-Flash by 1.966.764.8+1.9
FactsGPT-5.6 Sol
- SimpleQA VerifiedGPT-5.6 Sol by 26.842.969.7+26.8
- AA-Omniscience · AccuracyGPT-5.6 Sol by 1346.459.4+13
- AA-Omniscience · Non-hallucinationGPT-5.6 Sol by 4.33.57.8+4.3
Images and chartsGPT-5.6 Sol
- CharXiv (RQ)GPT-5.6 Sol by 16.86985.8+16.8
- MMMU-ProGPT-5.6 Sol by 6.47783.4+6.4
- LMArena · Visiontie12781281tie
MathGPT-5.6 Sol
- FrontierMath Tier 4GPT-5.6 Sol by 36.746.383+36.7
- FrontierMath Tiers 1-3 (v2)GPT-5.6 Sol by 17.971.289.1+17.9
- LiveBench · MathematicsGPT-5.6 Sol by 2.993.396.2+2.9
Following instructionsGPT-5.6 Sol
- LiveBench · Instruction FollowingGPT-5.6 Sol by 1.97071.8+1.9
Other results22 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.
- AA-OmniscienceGPT-5.6 Sol by 27.3-5.322+27.3
- Agents' Last ExamGPT-5.6 Sol by 20.931.852.7+20.9
- SWE Refactor BenchGPT-5.6 Sol by 16.711.828.5+16.7
- OSWorld 2.0GPT-5.6 Sol by 8.354.362.6+8.3
- vectara_factual_consistencyDeepSeek-V4.1-Flash by 8.295.887.6+8.2
- AA IntelligenceGPT-5.6 Sol by 7.539.547+7.5
- livebench_languageGPT-5.6 Sol by 6.581.287.7+6.5
- Terminal-Bench 4.0GPT-5.6 Sol by 6.131.237.3+6.1
- PostTrain Bench v1.1GPT-5.6 Sol by 5.730.536.2+5.7
- Terminal-bench 3.0GPT-5.6 Sol by 4.43034.4+4.4
- ZeroBench-main (w/tools)GPT-5.6 Sol by 44953+4
- CyberGymDeepSeek-V4.1-Flash by 3.688.184.5+3.6
- ARC-AGI-1GPT-5.6 Sol by 393.596.5+3
- Program BenchGPT-5.6 Sol by 2.720.323+2.7
- vectara_avg_summary_lengthGPT-5.6 Sol by 22.9 rating points108.2131.1+22.9 rating
- DeepSWE 1.1DeepSeek-V4.1-Flash by 1.274.273+1.2
- Chartography w/ tools (Pass@1)GPT-5.6 Sol by 178.979.9+1
- vectara_answer_ratetie99.999.1tie
- BabyVisiontie89.688.9tie
- HLE (with tools)tie63.964.5tie
- livebench_data_analysistie79.379.8tie
- MathArena Apex (Pass@1)tie65.665.6tie
Questions people ask
Which is better, DeepSeek-V4.1-Flash or GPT-5.6 Sol?
GPT-5.6 Sol wins six of the eight areas we test: agents, reasoning, facts, images and charts, math and following instructions. DeepSeek-V4.1-Flash wins none, but costs 94% less. They are level on coding and long documents.
Which is better for coding?
Neither. They win 2 coding tests each of the 5 both models report, and 1 is a tie.
Which is cheaper?
DeepSeek-V4.1-Flash costs $0.30 per million input tokens and $1.20 per million output tokens; GPT-5.6 Sol costs $4.00 and $20.00. That makes DeepSeek-V4.1-Flash about 94% cheaper for the same work.
How do you compare the two?
We use the 48 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 22 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.