Claude Opus 4.8 vs GPT-5.6 Sol
Wins 1 of 8 areas
Images and charts
Wins 7 of 8 areas
Coding · Agents · Reasoning · Facts · Math · Long documents · Following instructions
GPT-5.6 Sol is the stronger all-rounder.Claude Opus 4.8 is better at images and charts.
Both rank among the ten best models we track in coding and agents.
Scores updated · 71 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 software16GPT-5.6 Sol6 of 7 tests
- AgentsCarrying out multi-step tasks on its own05GPT-5.6 Sol5 of 7 tests · 2 ties
- ReasoningHard problems that need careful thinking05GPT-5.6 Sol5 of 7 tests · 2 ties
- MathCompetition and research-level math03GPT-5.6 Sol3 of 4 tests · 1 tie
- FactsGetting facts right instead of making them up12GPT-5.6 Sol2 of 3 tests
- Following instructionsDoing exactly what it is asked01GPT-5.6 Sol1 of 2 tests · 1 tie
- Long documentsFinding answers in very long texts01GPT-5.6 Sol1 of 1 test
- Images and chartsUnderstanding pictures, charts and video20Claude Opus 4.82 of 2 tests
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 three tests each model wins by the widest margin. Scores are out of 100.
Where GPT-5.6 Sol pulls ahead
- Extremely hard research-level math problemsFrontierMath Tier 4+26.9points ahead
- Abstract visual puzzles that people can solveARC-AGI-2+20.4points ahead
- Complex command-line tasks across many fieldsTerminal-Bench 4.0+18.2points ahead
Where Claude Opus 4.8 pulls ahead
- Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+52.9points ahead
- Long, multi-file coding tasks in real codebasesSWE-bench Pro+4.6points ahead
- Reasoning about charts from research papersCharXiv (RQ)+4.1points ahead
Every test, side by side
All 71 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 7.658.365.9+7.6
- LMArena · WebDevGPT-5.6 Sol by 62 rating points15561618+62 rating
- LiveBench · Agentic CodingGPT-5.6 Sol by 5.750.556.2+5.7
- SWE-bench ProClaude Opus 4.8 by 4.669.264.6+4.6
- Terminal-Bench 2.1GPT-5.6 Sol by 3.484.688+3.4
- SciCodeGPT-5.6 Sol by 2.754.457.1+2.7
- LiveBench · CodingGPT-5.6 Sol by 2.181.883.9+2.1
AgentsGPT-5.6 Sol
- Terminal-Bench 4.0GPT-5.6 Sol by 18.221.739.9+18.2
- τ-Bench V3 · BankingGPT-5.6 Sol by 10.134.244.3+10.1
- GDPValGPT-5.6 Sol by 7.847.855.6+7.8
- BrowseCompGPT-5.6 Sol by 6.184.390.4+6.1
- MCP AtlasGPT-5.6 Sol by 1.482.283.6+1.4
- AA ApexAgentstie39.439.9tie
- OSWorld-Verifiedtie83.483tie
ReasoningGPT-5.6 Sol
- ARC-AGI-2GPT-5.6 Sol by 20.472.192.5+20.4
- CritPtGPT-5.6 Sol by 11.420.932.3+11.4
- ARC-AGI-3GPT-5.6 Sol by 6.31.57.8+6.3
- LiveBench · ReasoningGPT-5.6 Sol by 2.589.291.7+2.5
- GPQA DiamondGPT-5.6 Sol by 2.19294.1+2.1
- Humanity's Last Examtie48.749.5tie
- SimpleBenchtie64.864.8tie
FactsGPT-5.6 Sol
- AA-Omniscience · Non-hallucinationClaude Opus 4.8 by 52.960.77.8+52.9
- SimpleQA VerifiedGPT-5.6 Sol by 16.75369.7+16.7
- AA-Omniscience · AccuracyGPT-5.6 Sol by 10.648.859.4+10.6
Images and chartsClaude Opus 4.8
- CharXiv (RQ)Claude Opus 4.8 by 4.189.985.8+4.1
- LMArena · VisionClaude Opus 4.8 by 16 rating points12951279+16 rating
MathGPT-5.6 Sol
- FrontierMath Tier 4GPT-5.6 Sol by 26.956.183+26.9
- FrontierMath Tiers 1-3 (v2)GPT-5.6 Sol by 9.18089.1+9.1
- LiveBench · MathematicsGPT-5.6 Sol by 1.994.396.2+1.9
- AIME 2026tie10099.9tie
Following instructionsGPT-5.6 Sol
- IFBenchGPT-5.6 Sol by 10.562.272.7+10.5
- LiveBench · Instruction Followingtie7271.8tie
Other results38 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.
- GDP (Surge AI)Claude Opus 4.8 by 54.184.830.7+54.1
- Program BenchClaude Opus 4.8 by 46.971.925+46.9
- Agents' Last ExamGPT-5.6 Sol by 2725.752.7+27
- MCP Mark VerifiedGPT-5.6 Sol by 16.576.492.9+16.5
- SWE-MarathonGPT-5.6 Sol by 16.52642.5+16.5
- DeepSWEGPT-5.6 Sol by 14.75872.7+14.7
- DeepSWE 1.1GPT-5.6 Sol by 145973+14
- livebench_data_analysisGPT-5.6 Sol by 13.86679.8+13.8
- Terminal-Bench 4.0GPT-5.6 Sol by 13.723.637.3+13.7
- Terminal-bench 3.0GPT-5.6 Sol by 13.321.134.4+13.3
- GDPval-AA v2GPT-5.6 Sol by 118 rating points15931711+118 rating
- GDPval-AA v2 EloGPT-5.6 Sol by 117 rating points15931710+117 rating
- PaperBenchGPT-5.6 Sol by 10.280.390.5+10.2
- τ²-Bench Telecom (AA run)Claude Opus 4.8 by 9.394.485.1+9.3
- Agents' Last Exam (Pass / Score)GPT-5.6 Sol by 8.545.153.6+8.5
- livebench_languageGPT-5.6 Sol by 879.787.7+8
- AA Agentic IndexGPT-5.6 Sol by 7.942.650.5+7.9
- ProgramBench (Almost Solved)GPT-5.6 Sol by 7.515.523+7.5
- OSWorld 2.0GPT-5.6 Sol by 6.955.762.6+6.9
- AA-OmniscienceClaude Opus 4.8 by 6.828.822+6.8
- HLE (with tools)GPT-5.6 Sol by 6.657.964.5+6.6
- CyberGymGPT-5.6 Sol by 5.778.884.5+5.7
- AA IntelligenceGPT-5.6 Sol by 5.241.847+5.2
- Toolathlon VerifiedClaude Opus 4.8 by 579.974.9+5
- HealthBench ProfessionalGPT-5.6 Sol by 4.755.860.5+4.7
- AndroidBenchGPT-5.6 Sol by 4.269.874+4.2
- ARC-AGI-1GPT-5.6 Sol by 492.596.5+4
- MLS Bench Litelower is betterClaude Opus 4.8 by 3.442.846.2+3.4
- Artificial Analysis Coding IndexGPT-5.6 Sol by 3.174.377.4+3.1
- HiL-Bench (Tools-allowed)Claude Opus 4.8 by 335.332.3+3
- JobBenchClaude Opus 4.8 by 348.445.4+3
- OfficeQA ProClaude Opus 4.8 by 366.263.2+3
- Agents' Last Exam (ALE-CLI)GPT-5.6 Sol by 2.925.728.6+2.9
- HealthBenchClaude Opus 4.8 by 2.359.357+2.3
- ToolathlonClaude Opus 4.8 by 1.959.958+1.9
- PostTrainBenchClaude Opus 4.8 by 137.236.2+1
- SpreadsheetBench 2tie31.632.4tie
- ResearchRubricstie73.573.8tie
Questions people ask
Which is better, Claude Opus 4.8 or GPT-5.6 Sol?
GPT-5.6 Sol wins seven of the eight areas we test: coding, agents, reasoning, facts, math, long documents and following instructions. Claude Opus 4.8 wins images and charts.
Which is better for coding?
GPT-5.6 Sol. It wins 6 of the 7 coding tests both models report; Claude Opus 4.8 wins 1.
Which is cheaper?
Claude Opus 4.8 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 71 benchmark tests both models have published scores on. The verdict counts the 33 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 38 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.