GPT-5.6 Sol vs Qwen3.5 27B
Wins 6 of 8 areas
Coding · Agents · Reasoning · Images and charts · Math · Long documents
Wins 1 of 8 areas
Following instructions
GPT-5.6 Sol is the stronger all-rounder.Qwen3.5 27B is cheaper and better at following instructions.
Scores updated · 31 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-5.6 Sol5 of 5 tests
- CodingWriting and fixing software40GPT-5.6 Sol4 of 4 tests
- ReasoningHard problems that need careful thinking30GPT-5.6 Sol3 of 3 tests
- Images and chartsUnderstanding pictures, charts and video30GPT-5.6 Sol3 of 3 tests
- MathCompetition and research-level math10GPT-5.6 Sol1 of 1 test
- Long documentsFinding answers in very long texts10GPT-5.6 Sol1 of 1 test
- Following instructionsDoing exactly what it is asked01Qwen3.5 27B1 of 1 test
- FactsGetting facts right instead of making them up11Even1 each · 1 tie
Math, 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 89% 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
- Answers hard knowledge questions correctlyAA-Omniscience · Accuracy+38.7points ahead
- Hard command-line tasks in a real terminalTerminal-Bench Hard+33.3points ahead
- Research-level physics problemsCritPt+31.4points ahead
Where Qwen3.5 27B pulls ahead
- Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+10.7points ahead
- Follows unfamiliar, precisely checkable instructionsIFBench+2.9points ahead
Every test, side by side
All 31 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 33.365.932.6+33.3
- LMArena · WebDevGPT-5.6 Sol by 259 rating points16161357+259 rating
- SciCodeGPT-5.6 Sol by 17.657.139.5+17.6
- SWE-bench ProGPT-5.6 Sol by 13.464.651.2+13.4
AgentsGPT-5.6 Sol
- BrowseCompGPT-5.6 Sol by 29.490.461+29.4
- OSWorld-VerifiedGPT-5.6 Sol by 26.88356.2+26.8
- GDPValGPT-5.6 Sol by 22.455.433+22.4
- AA IT-Bench SREGPT-5.6 Sol by 20.756.235.5+20.7
- MCP AtlasGPT-5.6 Sol by 15.283.668.4+15.2
ReasoningGPT-5.6 Sol
- CritPtGPT-5.6 Sol by 31.432.30.9+31.4
- Humanity's Last ExamGPT-5.6 Sol by 25.649.523.9+25.6
- GPQA DiamondGPT-5.6 Sol by 8.394.185.8+8.3
FactsEven
- AA-Omniscience · AccuracyGPT-5.6 Sol by 38.759.420.7+38.7
- AA-Omniscience · Non-hallucinationQwen3.5 27B by 10.77.818.5+10.7
- Vectara HHEM hallucination ratelower is bettertie12.412.1tie
Images and chartsGPT-5.6 Sol
- MMMU-ProGPT-5.6 Sol by 8.483.475+8.4
- CharXiv (RQ)GPT-5.6 Sol by 6.385.879.5+6.3
- LMArena · VisionGPT-5.6 Sol by 40 rating points12811241+40 rating
Following instructionsQwen3.5 27B
- IFBenchQwen3.5 27B by 2.972.775.6+2.9
Other results10 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 6622-44+66
- BabyVisionGPT-5.6 Sol by 44.388.944.6+44.3
- Artificial Analysis Coding IndexGPT-5.6 Sol by 42.577.434.9+42.5
- AA IntelligenceGPT-5.6 Sol by 24.14722.9+24.1
- τ²-Bench Telecom (AA run)Qwen3.5 27B by 8.885.193.9+8.8
- LVBenchGPT-5.6 Sol by 8.582.173.6+8.5
- AA Agentic IndexQwen3.5 27B by 4.150.554.6+4.1
- vectara_avg_summary_lengthGPT-5.6 Sol by 36.7 rating points131.194.4+36.7 rating
- vectara_answer_ratetie99.199.8tie
- vectara_factual_consistencytie87.687.9tie
Questions people ask
Which is better, GPT-5.6 Sol or Qwen3.5 27B?
GPT-5.6 Sol wins six of the eight areas we test: coding, agents, reasoning, images and charts, math and long documents. Qwen3.5 27B wins following instructions, and costs 89% less. They are level on facts.
Which is better for coding?
GPT-5.6 Sol. It wins 4 of the 4 coding tests both models report; Qwen3.5 27B wins none.
Which is cheaper?
GPT-5.6 Sol costs $4.00 per million input tokens and $20.00 per million output tokens; Qwen3.5 27B costs $0.30 and $2.40. That makes Qwen3.5 27B about 89% cheaper for the same work.
How do you compare the two?
We use the 31 benchmark tests both models have published scores on. The verdict counts the 21 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 10 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.