DeepSeek-V4-Pro vs GPT-5.5
Wins 0 of 7 areas
—
Wins 7 of 7 areas
Coding · Agents · Reasoning · Facts · Math · Long documents · Following instructions
GPT-5.5 is the stronger all-rounder.DeepSeek-V4-Pro is cheaper.
Scores updated · 56 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-5.57 of 7 tests
- AgentsCarrying out multi-step tasks on its own06GPT-5.56 of 7 tests · 1 tie
- MathCompetition and research-level math06GPT-5.56 of 6 tests
- ReasoningHard problems that need careful thinking05GPT-5.55 of 5 tests
- FactsGetting facts right instead of making them up03GPT-5.53 of 4 tests · 1 tie
- Following instructionsDoing exactly what it is asked01GPT-5.51 of 2 tests · 1 tie
- Long documentsFinding answers in very long texts01GPT-5.51 of 1 test
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-Pro costs 96% 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-5.5 pulls ahead
- Extremely hard research-level math problemsFrontierMath Tier 4+70.1points ahead
- Unpublished advanced math problemsFrontierMath Tiers 1-3 (v2)+40points ahead
- Proof problems from the US Math OlympiadUSAMO 2026+37.5points ahead
Where DeepSeek-V4-Pro pulls ahead
No clear win on a test scored out of 100.
Every test, side by side
All 56 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingGPT-5.5
- Terminal-Bench 2.1GPT-5.5 by 20.36484.3+20.3
- Terminal-Bench HardGPT-5.5 by 14.446.260.6+14.4
- LiveBench · CodingGPT-5.5 by 12.27082.2+12.2
- LiveBench · Agentic CodingGPT-5.5 by 11.442.654+11.4
- SciCodeGPT-5.5 by 550.855.8+5
- LMArena · WebDevGPT-5.5 by 49 rating points14641513+49 rating
- SWE-bench ProGPT-5.5 by 3.255.458.6+3.2
AgentsGPT-5.5
- AA ApexAgentsGPT-5.5 by 13.424.337.7+13.4
- GDPValGPT-5.5 by 9.832.942.7+9.8
- τ-Bench V3 · BankingGPT-5.5 by 8.930.139+8.9
- AA IT-Bench SREGPT-5.5 by 7.538.345.8+7.5
- MCP AtlasGPT-5.5 by 1.773.675.3+1.7
- BrowseCompGPT-5.5 by 183.484.4+1
- Terminal-Bench 4.0tie14.614.6tie
ReasoningGPT-5.5
- SimpleBenchGPT-5.5 by 18.150.969+18.1
- CritPtGPT-5.5 by 14.212.927.1+14.2
- Humanity's Last ExamGPT-5.5 by 8.337.545.8+8.3
- LiveBench · ReasoningGPT-5.5 by 782.789.7+7
- GPQA DiamondGPT-5.5 by 4.788.893.5+4.7
FactsGPT-5.5
- SimpleQA VerifiedGPT-5.5 by 16.846.263+16.8
- AA-Omniscience · AccuracyGPT-5.5 by 154358+15
- AA-Omniscience · Non-hallucinationGPT-5.5 by 5.15.911+5.1
- Vectara HHEM hallucination ratelower is bettertie8.69.3tie
MathGPT-5.5
- FrontierMath Tier 4GPT-5.5 by 70.12.472.5+70.1
- FrontierMath Tiers 1-3 (v2)GPT-5.5 by 4045.385.3+40
- USAMO 2026GPT-5.5 by 37.560.798.2+37.5
- LiveBench · MathematicsGPT-5.5 by 5.290.795.9+5.2
- AIME 2026GPT-5.5 by 3.396.7100+3.3
- HMMT Feb. 2026GPT-5.5 by 3.395.298.5+3.3
Following instructionsGPT-5.5
- LiveBench · Instruction FollowingGPT-5.5 by 8.362.470.7+8.3
- IFBenchtie76.575.9tie
Other results24 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.
- DeepSWEGPT-5.5 by 57.212.870+57.2
- AA-OmniscienceGPT-5.5 by 31.2-10.720.5+31.2
- Program BenchGPT-5.5 by 2347.870.8+23
- GDPval-AA (Elo)GPT-5.5 by 215 rating points15541769+215 rating
- GDPval-AA v2GPT-5.5 by 203 rating points13061509+203 rating
- Toolathlon VerifiedGPT-5.5 by 17.655.973.5+17.6
- Artificial Analysis Coding IndexGPT-5.5 by 15.559.474.9+15.5
- Terminal-Bench 2.0GPT-5.5 by 14.867.982.7+14.8
- NL2RepoGPT-5.5 by 12.238.550.7+12.2
- AA Agentic IndexGPT-5.5 by 9.627.737.3+9.6
- livebench_languageGPT-5.5 by 9.378.187.4+9.3
- AA IntelligenceGPT-5.5 by 830.438.4+8
- HLE (with tools)DeepSeek-V4-Pro by 7.86052.2+7.8
- LiveBenchGPT-5.5 by 7.173.680.7+7.1
- livebench_data_analysisGPT-5.5 by 7.174.581.6+7.1
- ToolathlonGPT-5.5 by 3.851.855.6+3.8
- Tool-DecathlonGPT-5.5 by 2.852.855.6+2.8
- vectara_answer_rateGPT-5.5 by 2.897.2100+2.8
- vectara_avg_summary_lengthDeepSeek-V4-Pro by 24.2 rating points153.8129.6+24.2 rating
- τ²-Bench Telecom (AA run)DeepSeek-V4-Pro by 2.396.293.9+2.3
- HMMT Nov. 2025GPT-5.5 by 2.194.496.5+2.1
- CyberGymDeepSeek-V4-Pro by 1.583.381.8+1.5
- Agents' Last Examtie25.726.6tie
- vectara_factual_consistencytie91.490.7tie
Questions people ask
Which is better, DeepSeek-V4-Pro or GPT-5.5?
GPT-5.5 wins all seven areas where both have results: coding, agents, reasoning, facts, math, long documents and following instructions. DeepSeek-V4-Pro wins none, but costs 96% less.
Which is better for coding?
GPT-5.5. It wins 7 of the 7 coding tests both models report; DeepSeek-V4-Pro wins none.
Which is cheaper?
DeepSeek-V4-Pro costs $0.43 per million input tokens and $0.87 per million output tokens; GPT-5.5 costs $5.00 and $30.00. That makes DeepSeek-V4-Pro about 96% cheaper for the same work.
How do you compare the two?
We use the 56 benchmark tests both models have published scores on. The verdict counts the 32 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 24 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.