GPT-5.6 Sol vs GPT-6 Sol
Wins 5 of 8 areas
Coding · Agents · Reasoning · Images and charts · Following instructions
Wins 1 of 8 areas
Math
GPT-5.6 Sol is the stronger all-rounder.GPT-6 Sol is cheaper and better at math.
Both rank among the ten best models we track in math.
Scores updated · 42 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 thinking51GPT-5.6 Sol5 of 6 tests
- CodingWriting and fixing software21GPT-5.6 Sol2 of 4 tests · 1 tie
- AgentsCarrying out multi-step tasks on its own21GPT-5.6 Sol2 of 3 tests
- Images and chartsUnderstanding pictures, charts and video10GPT-5.6 Sol1 of 2 tests · 1 tie
- Following instructionsDoing exactly what it is asked10GPT-5.6 Sol1 of 1 test
- MathCompetition and research-level math01GPT-6 Sol1 of 3 tests · 2 ties
- FactsGetting facts right instead of making them up22Even2 each
- 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.
GPT-6 Sol costs 50% 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
- Short factual questions, answered correctlySimpleQA Verified+9points ahead
- Finds the root cause of IT system incidentsAA IT-Bench SRE+6.8points ahead
- Real work tasks from 44 professionsGDPVal+5points ahead
Where GPT-6 Sol pulls ahead
- Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+32.1points ahead
- Common-sense trick questionsSimpleBench+8.3points ahead
- Extremely hard research-level math problemsFrontierMath Tier 4+7points ahead
Every test, side by side
All 42 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingGPT-5.6 Sol
- LMArena · WebDevGPT-6 Sol by 58 rating points16151673+58 rating
- LiveBench · Agentic CodingGPT-5.6 Sol by 3.356.252.9+3.3
- LiveBench · CodingGPT-5.6 Sol by 2.183.981.8+2.1
- SciCodetie57.157.6tie
AgentsGPT-5.6 Sol
- AA IT-Bench SREGPT-5.6 Sol by 6.856.249.4+6.8
- GDPValGPT-5.6 Sol by 555.450.4+5
- Terminal-Bench 4.0GPT-6 Sol by 439.943.9+4
ReasoningGPT-5.6 Sol
- SimpleBenchGPT-6 Sol by 8.364.873.1+8.3
- ARC-AGI-3GPT-5.6 Sol by 3.27.84.6+3.2
- LiveBench · ReasoningGPT-5.6 Sol by 391.788.7+3
- ARC-AGI-2GPT-5.6 Sol by 2.992.589.6+2.9
- Humanity's Last ExamGPT-5.6 Sol by 1.649.547.9+1.6
- CritPtGPT-5.6 Sol by 1.432.330.9+1.4
FactsEven
- AA-Omniscience · Non-hallucinationGPT-6 Sol by 32.17.839.9+32.1
- SimpleQA VerifiedGPT-5.6 Sol by 969.760.7+9
- Vectara HHEM hallucination ratelower is betterGPT-6 Sol by 5.912.46.5+5.9
- AA-Omniscience · AccuracyGPT-5.6 Sol by 4.959.454.5+4.9
Images and chartsGPT-5.6 Sol
- LMArena · VisionGPT-5.6 Sol by 49 rating points12821233+49 rating
- MMMU-Protie83.482.9tie
MathGPT-6 Sol
- FrontierMath Tier 4GPT-6 Sol by 78390+7
- FrontierMath Tiers 1-3 (v2)tie89.189.8tie
- LiveBench · Mathematicstie96.296.4tie
Following instructionsGPT-5.6 Sol
- LiveBench · Instruction FollowingGPT-5.6 Sol by 3.371.868.6+3.3
Other results18 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.
- Terminal-Bench 4.0GPT-6 Sol by 12.137.349.4+12.1
- GDPval-AA 2.1GPT-5.6 Sol by 101 rating points15881487+101 rating
- vectara_avg_summary_lengthGPT-5.6 Sol by 59.7 rating points131.171.4+59.7 rating
- vectara_factual_consistencyGPT-6 Sol by 5.987.693.5+5.9
- Terminal-Bench-Science 0.1GPT-6 Sol by 5.222.427.6+5.2
- AA-OmniscienceGPT-6 Sol by 5.12227.1+5.1
- DeepSWE 1.1GPT-5.6 Sol by 4.27368.8+4.2
- HealthBench length-adjustedGPT-5.6 Sol by 3.85753.2+3.8
- Agents' Last ExamGPT-6 Sol by 3.752.756.4+3.7
- HealthBench Hard length-adjustedGPT-5.6 Sol by 333.130.1+3
- livebench_languageGPT-5.6 Sol by 2.487.785.3+2.4
- OSWorld 2.0GPT-6 Sol by 1.862.664.4+1.8
- livebench_data_analysisGPT-6 Sol by 1.479.881.2+1.4
- ARC-AGI-1GPT-5.6 Sol by 196.595.5+1
- vectara_answer_ratetie99.1100tie
- HealthBench Consensus length-adjustedtie95.596.2tie
- AA Intelligencetie4747.6tie
- HealthBench Professional length-adjustedtie60.560.8tie
Questions people ask
Which is better, GPT-5.6 Sol or GPT-6 Sol?
GPT-5.6 Sol wins five of the eight areas we test: coding, agents, reasoning, images and charts and following instructions. GPT-6 Sol wins math, and costs 50% less. They are level on facts and long documents.
Which is better for coding?
GPT-5.6 Sol. It wins 2 of the 4 coding tests both models report; GPT-6 Sol wins 1, and 1 is a tie.
Which is cheaper?
GPT-5.6 Sol costs $4.00 per million input tokens and $20.00 per million output tokens; GPT-6 Sol costs $2.00 and $10.00. That makes GPT-6 Sol about 50% cheaper for the same work.
How do you compare the two?
We use the 42 benchmark tests both models have published scores on. The verdict counts the 24 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 18 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.