Claude Opus 4.5 vs GPT-5.6 Sol
Wins 0 of 8 areas
—
Wins 7 of 8 areas
Coding · Agents · Reasoning · Images and charts · Math · Long documents · Following instructions
GPT-5.6 Sol is the stronger all-rounder.
Scores updated · 43 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 software06GPT-5.6 Sol6 of 6 tests
- ReasoningHard problems that need careful thinking05GPT-5.6 Sol5 of 5 tests
- AgentsCarrying out multi-step tasks on its own04GPT-5.6 Sol4 of 4 tests
- MathCompetition and research-level math04GPT-5.6 Sol4 of 4 tests
- Images and chartsUnderstanding pictures, charts and video02GPT-5.6 Sol2 of 2 tests
- Following instructionsDoing exactly what it is asked02GPT-5.6 Sol2 of 2 tests
- Long documentsFinding answers in very long texts01GPT-5.6 Sol1 of 1 test
- FactsGetting facts right instead of making them up22Even2 each
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.
GPT-5.6 Sol costs 20% 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
- Extremely hard research-level math problemsFrontierMath Tier 4+78.1points ahead
- Abstract visual puzzles that people can solveARC-AGI-2+54.9points ahead
- Unpublished advanced math problemsFrontierMath Tiers 1-3 (v2)+54.7points ahead
Where Claude Opus 4.5 pulls ahead
- Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+31.2points ahead
Every test, side by side
All 43 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 18.94765.9+18.9
- LiveBench · Agentic CodingGPT-5.6 Sol by 16.539.756.2+16.5
- LMArena · WebDevGPT-5.6 Sol by 149 rating points14691618+149 rating
- SWE-bench ProGPT-5.6 Sol by 12.65264.6+12.6
- SciCodeGPT-5.6 Sol by 7.649.557.1+7.6
- LiveBench · CodingGPT-5.6 Sol by 4.279.783.9+4.2
AgentsGPT-5.6 Sol
- BrowseCompGPT-5.6 Sol by 53.43790.4+53.4
- MCP AtlasGPT-5.6 Sol by 21.362.383.6+21.3
- OSWorld-VerifiedGPT-5.6 Sol by 16.766.383+16.7
- GDPValGPT-5.6 Sol by 8.347.355.6+8.3
ReasoningGPT-5.6 Sol
- ARC-AGI-2GPT-5.6 Sol by 54.937.692.5+54.9
- CritPtGPT-5.6 Sol by 27.74.632.3+27.7
- Humanity's Last ExamGPT-5.6 Sol by 19.430.149.5+19.4
- LiveBench · ReasoningGPT-5.6 Sol by 11.680.191.7+11.6
- GPQA DiamondGPT-5.6 Sol by 7.586.694.1+7.5
FactsEven
- AA-Omniscience · Non-hallucinationClaude Opus 4.5 by 31.2397.8+31.2
- SimpleQA VerifiedGPT-5.6 Sol by 2445.769.7+24
- AA-Omniscience · AccuracyGPT-5.6 Sol by 12.846.659.4+12.8
- Vectara HHEM hallucination ratelower is betterClaude Opus 4.5 by 1.510.912.4+1.5
Images and chartsGPT-5.6 Sol
- CharXiv (RQ)GPT-5.6 Sol by 18.667.285.8+18.6
- MMMU-ProGPT-5.6 Sol by 9.47483.4+9.4
MathGPT-5.6 Sol
- FrontierMath Tier 4GPT-5.6 Sol by 78.14.983+78.1
- FrontierMath Tiers 1-3 (v2)GPT-5.6 Sol by 54.734.489.1+54.7
- LiveBench · MathematicsGPT-5.6 Sol by 5.890.496.2+5.8
- AIME 2026GPT-5.6 Sol by 4.895.199.9+4.8
Following instructionsGPT-5.6 Sol
- IFBenchGPT-5.6 Sol by 14.75872.7+14.7
- LiveBench · Instruction FollowingGPT-5.6 Sol by 9.362.571.8+9.3
Other results15 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.
- CyberGymGPT-5.6 Sol by 33.950.684.5+33.9
- Artificial Analysis Coding IndexGPT-5.6 Sol by 29.647.877.4+29.6
- HLE (with tools)GPT-5.6 Sol by 21.343.264.5+21.3
- AA IntelligenceGPT-5.6 Sol by 17.929.147+17.9
- PaperBenchGPT-5.6 Sol by 17.672.990.5+17.6
- ARC-AGI-1GPT-5.6 Sol by 14.58296.5+14.5
- ToolathlonGPT-5.6 Sol by 14.543.558+14.5
- AA Agentic IndexClaude Opus 4.5 by 9.159.650.5+9.1
- AA-OmniscienceGPT-5.6 Sol by 81422+8
- livebench_languageGPT-5.6 Sol by 6.481.387.7+6.4
- livebench_data_analysisGPT-5.6 Sol by 5.474.479.8+5.4
- τ²-Bench Telecom (AA run)Claude Opus 4.5 by 4.489.585.1+4.4
- vectara_avg_summary_lengthGPT-5.6 Sol by 16.6 rating points114.5131.1+16.6 rating
- vectara_factual_consistencyClaude Opus 4.5 by 1.589.187.6+1.5
- vectara_answer_ratetie98.799.1tie
Questions people ask
Which is better, Claude Opus 4.5 or GPT-5.6 Sol?
GPT-5.6 Sol wins seven of the eight areas we test: coding, agents, reasoning, images and charts, math, long documents and following instructions. Claude Opus 4.5 wins none. They are level on facts.
Which is better for coding?
GPT-5.6 Sol. It wins 6 of the 6 coding tests both models report; Claude Opus 4.5 wins none.
Which is cheaper?
Claude Opus 4.5 costs $5.00 per million input tokens and $25.00 per million output tokens; GPT-5.6 Sol costs $4.00 and $20.00. That makes GPT-5.6 Sol about 20% cheaper for the same work.
How do you compare the two?
We use the 43 benchmark tests both models have published scores on. The verdict counts the 28 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 15 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.