Claude Opus 5.5 vs GPT-5.6 Sol
Wins 6 of 8 areas
Coding · Agents · Reasoning · Facts · Images and charts · Math
Wins 1 of 8 areas
Following instructions
Claude Opus 5.5 is the stronger all-rounder.GPT-5.6 Sol is better at following instructions.
Both rank among the ten best models we track in reasoning, coding, agents and math.
Scores updated · 51 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.
- CodingWriting and fixing software50Claude Opus 5.55 of 5 tests
- FactsGetting facts right instead of making them up40Claude Opus 5.54 of 4 tests
- ReasoningHard problems that need careful thinking20Claude Opus 5.52 of 5 tests · 3 ties
- MathCompetition and research-level math20Claude Opus 5.52 of 3 tests · 1 tie
- Images and chartsUnderstanding pictures, charts and video20Claude Opus 5.52 of 2 tests
- AgentsCarrying out multi-step tasks on its own21Claude Opus 5.52 of 4 tests · 1 tie
- Following instructionsDoing exactly what it is asked01GPT-5.6 Sol1 of 1 test
- 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.
The biggest differences
The tests each model wins by the widest margin, up to three each. Scores are out of 100.
Where Claude Opus 5.5 pulls ahead
- Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+33.6points ahead
- Long, multi-file coding tasks in real codebasesSWE-bench Pro+25.3points ahead
- Common-sense trick questionsSimpleBench+23.6points ahead
Where GPT-5.6 Sol pulls ahead
- Finds the root cause of IT system incidentsAA IT-Bench SRE+18points ahead
- Follows detailed instructions exactlyLiveBench · Instruction Following+6.2points ahead
Every test, side by side
All 51 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingClaude Opus 5.5
- SWE-bench ProClaude Opus 5.5 by 25.389.964.6+25.3
- LMArena · WebDevClaude Opus 5.5 by 199 rating points18141615+199 rating
- LiveBench · Agentic CodingClaude Opus 5.5 by 15.571.756.2+15.5
- SciCodeClaude Opus 5.5 by 9.866.957.1+9.8
- LiveBench · CodingClaude Opus 5.5 by 5.489.383.9+5.4
AgentsClaude Opus 5.5
- Terminal-Bench 4.0Claude Opus 5.5 by 19.759.639.9+19.7
- AA IT-Bench SREGPT-5.6 Sol by 1838.256.2+18
- GDPValClaude Opus 5.5 by 12.968.355.4+12.9
- BrowseComptie90.890.4tie
ReasoningClaude Opus 5.5
- SimpleBenchClaude Opus 5.5 by 23.688.464.8+23.6
- Humanity's Last ExamClaude Opus 5.5 by 11.961.449.5+11.9
- ARC-AGI-2tie91.792.5tie
- CritPttie31.732.3tie
- LiveBench · Reasoningtie92.291.7tie
FactsClaude Opus 5.5
- AA-Omniscience · Non-hallucinationClaude Opus 5.5 by 33.641.47.8+33.6
- AA-Omniscience · AccuracyClaude Opus 5.5 by 6.866.259.4+6.8
- SimpleQA VerifiedClaude Opus 5.5 by 2.572.269.7+2.5
- Vectara HHEM hallucination ratelower is betterClaude Opus 5.5 by 2.59.912.4+2.5
Images and chartsClaude Opus 5.5
- MMMU-ProClaude Opus 5.5 by 4.387.783.4+4.3
- LMArena · VisionClaude Opus 5.5 by 42 rating points13241282+42 rating
MathClaude Opus 5.5
- FrontierMath Tier 4Claude Opus 5.5 by 129583+12
- FrontierMath Tiers 1-3 (v2)Claude Opus 5.5 by 2.191.289.1+2.1
- LiveBench · Mathematicstie97.196.2tie
Following instructionsGPT-5.6 Sol
- LiveBench · Instruction FollowingGPT-5.6 Sol by 6.265.771.8+6.2
Other results26 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.
- Program BenchClaude Opus 5.5 by 68.291.223+68.2
- Terminal-Bench-Science 0.1Claude Opus 5.5 by 36.65922.4+36.6
- Terminal-Bench 4.0Claude Opus 5.5 by 29.166.437.3+29.1
- HiL-Bench (Tools-allowed)Claude Opus 5.5 by 26.75932.3+26.7
- GDPval-AA 2.1Claude Opus 5.5 by 258 rating points18461588+258 rating
- AA-OmniscienceClaude Opus 5.5 by 24.446.422+24.4
- OSWorld 2.0Claude Opus 5.5 by 19.281.862.6+19.2
- OSWorld 2.0 (partial)Claude Opus 5.5 by 19.281.862.6+19.2
- PostTrainBenchClaude Opus 5.5 by 13.149.336.2+13.1
- AA IntelligenceClaude Opus 5.5 by 10.657.647+10.6
- vectara_avg_summary_lengthClaude Opus 5.5 by 61 rating points192.1131.1+61 rating
- charxiv_rq_with_pythonClaude Opus 5.5 by 693.887.8+6
- HealthBench ProfessionalClaude Opus 5.5 by 5.165.660.5+5.1
- ArXivMath without toolsClaude Opus 5.5 by 4.591.286.7+4.5
- OfficeQA ProClaude Opus 5.5 by 4.567.763.2+4.5
- HealthBenchClaude Opus 5.5 by 3.660.657+3.6
- HealthBench length-adjustedClaude Opus 5.5 by 3.660.657+3.6
- HLE (with tools)Claude Opus 5.5 by 3.267.764.5+3.2
- Toolathlon VerifiedClaude Opus 5.5 by 2.977.874.9+2.9
- vectara_factual_consistencyClaude Opus 5.5 by 2.590.187.6+2.5
- LVBenchClaude Opus 5.5 by 1.683.782.1+1.6
- livebench_languageGPT-5.6 Sol by 1.486.387.7+1.4
- DeepSWE 1.1Claude Opus 5.5 by 1.274.273+1.2
- ARC-AGI-1Claude Opus 5.5 by 197.596.5+1
- vectara_answer_ratetie99.799.1tie
- livebench_data_analysistie80.379.8tie
Questions people ask
Which is better, Claude Opus 5.5 or GPT-5.6 Sol?
Claude Opus 5.5 wins six of the eight areas we test: coding, agents, reasoning, facts, images and charts and math. GPT-5.6 Sol wins following instructions. They are level on long documents.
Which is better for coding?
Claude Opus 5.5. It wins 5 of the 5 coding tests both models report; GPT-5.6 Sol wins none.
Which is cheaper?
Claude Opus 5.5 costs $4.00 per million input tokens and $20.00 per million output tokens; GPT-5.6 Sol costs $4.00 and $20.00. For a million tokens read plus a million written, they cost about the same.
How do you compare the two?
We use the 51 benchmark tests both models have published scores on. The verdict counts the 25 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 26 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.