DeepSeek-V4-Flash vs GPT-5.6 Sol
Wins 0 of 7 areas
—
Wins 6 of 7 areas
Coding · Agents · Reasoning · Facts · Math · Long documents
GPT-5.6 Sol is the stronger all-rounder.DeepSeek-V4-Flash is cheaper.
Scores updated · 49 tests both models report · How we compare
Where each one wins
Tests won in each of the seven areas where both have results. 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 software07GPT-5.6 Sol7 of 7 tests
- AgentsCarrying out multi-step tasks on its own06GPT-5.6 Sol6 of 6 tests
- ReasoningHard problems that need careful thinking06GPT-5.6 Sol6 of 6 tests
- MathCompetition and research-level math04GPT-5.6 Sol4 of 4 tests
- FactsGetting facts right instead of making them up02GPT-5.6 Sol2 of 3 tests · 1 tie
- Long documentsFinding answers in very long texts01GPT-5.6 Sol1 of 1 test
- Following instructionsDoing exactly what it is asked11Even1 each
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.
DeepSeek-V4-Flash costs 93% 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
- Extremely hard research-level math problemsFrontierMath Tier 4+58.6points ahead
- Short factual questions, answered correctlySimpleQA Verified+35.6points ahead
- Unpublished advanced math problemsFrontierMath Tiers 1-3 (v2)+31.6points ahead
Where DeepSeek-V4-Flash pulls ahead
- Follows unfamiliar, precisely checkable instructionsIFBench+6.5points ahead
Every test, side by side
All 49 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 30.335.665.9+30.3
- LMArena · WebDevGPT-5.6 Sol by 190 rating points14301620+190 rating
- SWE-bench ProGPT-5.6 Sol by 1252.664.6+12
- LiveBench · Agentic CodingGPT-5.6 Sol by 9.446.856.2+9.4
- Terminal-Bench 2.1GPT-5.6 Sol by 9.378.788+9.3
- LiveBench · CodingGPT-5.6 Sol by 8.97583.9+8.9
- SciCodeGPT-5.6 Sol by 6.850.357.1+6.8
AgentsGPT-5.6 Sol
- Terminal-Bench 4.0GPT-5.6 Sol by 27.812.139.9+27.8
- AA IT-Bench SREGPT-5.6 Sol by 24.731.556.2+24.7
- BrowseCompGPT-5.6 Sol by 17.273.290.4+17.2
- MCP AtlasGPT-5.6 Sol by 14.66983.6+14.6
- GDPValGPT-5.6 Sol by 8.746.955.6+8.7
- τ-Bench V3 · BankingGPT-5.6 Sol by 4.939.444.3+4.9
ReasoningGPT-5.6 Sol
- ARC-AGI-2GPT-5.6 Sol by 31.161.492.5+31.1
- SimpleBenchGPT-5.6 Sol by 18.546.364.8+18.5
- CritPtGPT-5.6 Sol by 15.716.632.3+15.7
- Humanity's Last ExamGPT-5.6 Sol by 10.938.649.5+10.9
- LiveBench · ReasoningGPT-5.6 Sol by 5.186.691.7+5.1
- GPQA DiamondGPT-5.6 Sol by 3.390.894.1+3.3
FactsGPT-5.6 Sol
- SimpleQA VerifiedGPT-5.6 Sol by 35.634.169.7+35.6
- AA-Omniscience · AccuracyGPT-5.6 Sol by 1940.459.4+19
- AA-Omniscience · Non-hallucinationtie8.37.8tie
MathGPT-5.6 Sol
- FrontierMath Tier 4GPT-5.6 Sol by 58.624.483+58.6
- FrontierMath Tiers 1-3 (v2)GPT-5.6 Sol by 31.657.589.1+31.6
- LiveBench · MathematicsGPT-5.6 Sol by 9.486.896.2+9.4
- AIME 2026GPT-5.6 Sol by 4.195.899.9+4.1
Following instructionsEven
- IFBenchDeepSeek-V4-Flash by 6.579.272.7+6.5
- LiveBench · Instruction FollowingGPT-5.6 Sol by 6.465.571.8+6.4
Other results20 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 522 rating points11891711+522 rating
- AA-OmniscienceGPT-5.6 Sol by 36.3-14.322+36.3
- Agents' Last ExamGPT-5.6 Sol by 27.525.252.7+27.5
- HLE (with tools)GPT-5.6 Sol by 19.445.164.5+19.4
- DeepSWE 1.1GPT-5.6 Sol by 18.654.473+18.6
- DeepSWEGPT-5.6 Sol by 18.354.472.7+18.3
- AA IntelligenceGPT-5.6 Sol by 12.734.347+12.7
- ToolathlonDeepSeek-V4-Flash by 12.370.358+12.3
- SWEBench Pro PublicGPT-5.6 Sol by 1252.664.6+12
- τ³-Bench BankingGPT-5.6 Sol by 10.122.933+10.1
- τ²-Bench Telecom (AA run)DeepSeek-V4-Flash by 9.99585.1+9.9
- AA Agentic IndexGPT-5.6 Sol by 8.841.750.5+8.8
- livebench_languageGPT-5.6 Sol by 8.579.287.7+8.5
- Artificial Analysis Coding IndexGPT-5.6 Sol by 8.369.177.4+8.3
- CyberGymGPT-5.6 Sol by 7.876.784.5+7.8
- ARC-AGI-1GPT-5.6 Sol by 7.58996.5+7.5
- Toolathlon VerifiedGPT-5.6 Sol by 4.670.374.9+4.6
- JobBenchGPT-5.6 Sol by 4.141.345.4+4.1
- StrongREJECTGPT-5.6 Sol by 1.197.498.5+1.1
- livebench_data_analysistie79.379.8tie
Questions people ask
Which is better, DeepSeek-V4-Flash or GPT-5.6 Sol?
GPT-5.6 Sol wins six of the seven areas where both have results: coding, agents, reasoning, facts, math and long documents. DeepSeek-V4-Flash wins none, but costs 93% less. They are level on following instructions.
Which is better for coding?
GPT-5.6 Sol. It wins 7 of the 7 coding tests both models report; DeepSeek-V4-Flash wins none.
Which is cheaper?
DeepSeek-V4-Flash costs $0.44 per million input tokens and $1.32 per million output tokens; GPT-5.6 Sol costs $4.00 and $20.00. That makes DeepSeek-V4-Flash about 93% cheaper for the same work.
How do you compare the two?
We use the 49 benchmark tests both models have published scores on. The verdict counts the 29 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 20 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.