GPT-5.5 vs Qwen3.5 27B
Wins 7 of 8 areas
Coding · Agents · Reasoning · Facts · Images and charts · Math · Long documents
Wins 0 of 8 areas
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GPT-5.5 is the stronger all-rounder.Qwen3.5 27B is cheaper.
Scores updated · 41 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.
- AgentsCarrying out multi-step tasks on its own50GPT-5.55 of 5 tests
- CodingWriting and fixing software40GPT-5.54 of 4 tests
- ReasoningHard problems that need careful thinking30GPT-5.53 of 3 tests
- MathCompetition and research-level math20GPT-5.52 of 2 tests
- FactsGetting facts right instead of making them up21GPT-5.52 of 3 tests
- Images and chartsUnderstanding pictures, charts and video21GPT-5.52 of 3 tests
- Long documentsFinding answers in very long texts10GPT-5.51 of 1 test
- Following instructionsDoing exactly what it is asked00Even0 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.
Qwen3.5 27B costs 92% 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
- Answers hard knowledge questions correctlyAA-Omniscience · Accuracy+37.3points ahead
- Hard command-line tasks in a real terminalTerminal-Bench Hard+28points ahead
- Research-level physics problemsCritPt+26.2points ahead
Where Qwen3.5 27B pulls ahead
- Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+7.5points ahead
- Math problems shown in pictures and chartsMathVista+3.6points ahead
Every test, side by side
All 41 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingGPT-5.5
- Terminal-Bench HardGPT-5.5 by 2860.632.6+28
- SciCodeGPT-5.5 by 16.355.839.5+16.3
- LMArena · WebDevGPT-5.5 by 156 rating points15131357+156 rating
- SWE-bench ProGPT-5.5 by 7.458.651.2+7.4
AgentsGPT-5.5
- BrowseCompGPT-5.5 by 23.484.461+23.4
- OSWorld-VerifiedGPT-5.5 by 22.578.756.2+22.5
- AA IT-Bench SREGPT-5.5 by 10.345.835.5+10.3
- GDPValGPT-5.5 by 9.742.733+9.7
- MCP AtlasGPT-5.5 by 6.975.368.4+6.9
ReasoningGPT-5.5
- CritPtGPT-5.5 by 26.227.10.9+26.2
- Humanity's Last ExamGPT-5.5 by 21.945.823.9+21.9
- GPQA DiamondGPT-5.5 by 7.793.585.8+7.7
FactsGPT-5.5
- AA-Omniscience · AccuracyGPT-5.5 by 37.35820.7+37.3
- AA-Omniscience · Non-hallucinationQwen3.5 27B by 7.51118.5+7.5
- Vectara HHEM hallucination ratelower is betterGPT-5.5 by 2.89.312.1+2.8
Images and chartsGPT-5.5
- LMArena · VisionGPT-5.5 by 52 rating points12921240+52 rating
- MMMU-ProGPT-5.5 by 4.979.975+4.9
- MathVistaQwen3.5 27B by 3.684.287.8+3.6
MathGPT-5.5
- HMMT Feb. 2026GPT-5.5 by 17.498.581.1+17.4
- AIME 2026GPT-5.5 by 8.310091.7+8.3
Other results19 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-5.5 by 64.520.5-44+64.5
- Terminal-Bench 2.0GPT-5.5 by 41.182.741.6+41.1
- Artificial Analysis Coding IndexGPT-5.5 by 4074.934.9+40
- Tool-DecathlonGPT-5.5 by 24.155.631.5+24.1
- NL2RepoGPT-5.5 by 23.450.727.3+23.4
- AA Agentic IndexQwen3.5 27B by 17.337.354.6+17.3
- AA IntelligenceGPT-5.5 by 15.538.422.9+15.5
- DynaMathQwen3.5 27B by 11.875.987.7+11.8
- BabyVisionGPT-5.5 by 11.355.944.6+11.3
- SuperGPQAGPT-5.5 by 7.172.765.6+7.1
- HMMT Nov. 2025GPT-5.5 by 6.796.589.8+6.7
- ERQAGPT-5.5 by 464.560.5+4
- vectara_avg_summary_lengthGPT-5.5 by 35.2 rating points129.694.4+35.2 rating
- vectara_factual_consistencyGPT-5.5 by 2.890.787.9+2.8
- EmbSpatial-BenchQwen3.5 27B by 2.681.984.5+2.6
- SimpleVQAGPT-5.5 by 2.658.656+2.6
- RealWorldQAQwen3.5 27B by 1.582.283.7+1.5
- vectara_answer_ratetie10099.8tie
- τ²-Bench Telecom (AA run)tie93.993.9tie
Questions people ask
Which is better, GPT-5.5 or Qwen3.5 27B?
GPT-5.5 wins seven of the eight areas we test: coding, agents, reasoning, facts, images and charts, math and long documents. Qwen3.5 27B wins none, but costs 92% less. They are level on following instructions.
Which is better for coding?
GPT-5.5. It wins 4 of the 4 coding tests both models report; Qwen3.5 27B wins none.
Which is cheaper?
GPT-5.5 costs $5.00 per million input tokens and $30.00 per million output tokens; Qwen3.5 27B costs $0.30 and $2.40. That makes Qwen3.5 27B about 92% cheaper for the same work.
How do you compare the two?
We use the 41 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 19 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.