GPT-5.6 Sol vs Grok4.5
Wins 7 of 8 areas
Coding · Agents · Reasoning · Facts · Images and charts · Math · Long documents
Wins 0 of 8 areas
—
GPT-5.6 Sol is the stronger all-rounder.Grok4.5 is cheaper.
Scores updated · 40 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 thinking61GPT-5.6 Sol6 of 7 tests
- CodingWriting and fixing software40GPT-5.6 Sol4 of 6 tests · 2 ties
- AgentsCarrying out multi-step tasks on its own30GPT-5.6 Sol3 of 3 tests
- MathCompetition and research-level math30GPT-5.6 Sol3 of 3 tests
- Images and chartsUnderstanding pictures, charts and video20GPT-5.6 Sol2 of 3 tests · 1 tie
- FactsGetting facts right instead of making them up21GPT-5.6 Sol2 of 3 tests
- Long documentsFinding answers in very long texts10GPT-5.6 Sol1 of 1 test
- Following instructionsDoing exactly what it is asked00Even0 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.
Grok4.5 costs 67% 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+58.6points ahead
- Abstract visual puzzles that people can solveARC-AGI-2+39.9points ahead
- Unpublished advanced math problemsFrontierMath Tiers 1-3 (v2)+31.9points ahead
Where Grok4.5 pulls ahead
- Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+38.1points ahead
- Common-sense trick questionsSimpleBench+5.2points ahead
Every test, side by side
All 40 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingGPT-5.6 Sol
- LiveBench · CodingGPT-5.6 Sol by 15.383.968.6+15.3
- LMArena · WebDevGPT-5.6 Sol by 68 rating points16201552+68 rating
- Terminal-Bench 2.1GPT-5.6 Sol by 6.48881.6+6.4
- SciCodeGPT-5.6 Sol by 2.157.155+2.1
- LiveBench · Agentic Codingtie56.256.5tie
- SWE-bench Protie64.664.7tie
AgentsGPT-5.6 Sol
- Terminal-Bench 4.0GPT-5.6 Sol by 29.339.910.6+29.3
- GDPValGPT-5.6 Sol by 11.155.644.5+11.1
- τ-Bench V3 · BankingGPT-5.6 Sol by 2.244.342.1+2.2
ReasoningGPT-5.6 Sol
- ARC-AGI-2GPT-5.6 Sol by 39.992.552.6+39.9
- CritPtGPT-5.6 Sol by 16.932.315.4+16.9
- ARC-AGI-3GPT-5.6 Sol by 7.57.80.3+7.5
- Humanity's Last ExamGPT-5.6 Sol by 6.849.542.7+6.8
- SimpleBenchGrok4.5 by 5.264.870+5.2
- LiveBench · ReasoningGPT-5.6 Sol by 4.591.787.2+4.5
- GPQA DiamondGPT-5.6 Sol by 194.193.1+1
FactsGPT-5.6 Sol
- AA-Omniscience · Non-hallucinationGrok4.5 by 38.17.845.9+38.1
- SimpleQA VerifiedGPT-5.6 Sol by 21.469.748.3+21.4
- AA-Omniscience · AccuracyGPT-5.6 Sol by 7.859.451.5+7.8
Images and chartsGPT-5.6 Sol
- CharXiv (RQ)GPT-5.6 Sol by 4.285.881.6+4.2
- MMMU-ProGPT-5.6 Sol by 383.480.4+3
- LMArena · Visiontie12791288tie
MathGPT-5.6 Sol
- FrontierMath Tier 4GPT-5.6 Sol by 58.68324.4+58.6
- FrontierMath Tiers 1-3 (v2)GPT-5.6 Sol by 31.989.157.2+31.9
- LiveBench · MathematicsGPT-5.6 Sol by 5.496.290.8+5.4
Following instructionsEven
- LiveBench · Instruction Followingtie71.871.5tie
Other results13 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-5.6 Sol by 24.937.312.4+24.9
- DeepSWEGPT-5.6 Sol by 19.772.753+19.7
- DeepSWE 1.1GPT-5.6 Sol by 197354+19
- GDPval-AA v2 EloGPT-5.6 Sol by 175 rating points17101535+175 rating
- SWE-MarathonGPT-5.6 Sol by 13.542.529+13.5
- ARC-AGI-1GPT-5.6 Sol by 10.896.585.7+10.8
- AA Agentic IndexGPT-5.6 Sol by 8.450.542.1+8.4
- AA IntelligenceGPT-5.6 Sol by 8.24738.8+8.2
- livebench_data_analysisGPT-5.6 Sol by 6.879.873+6.8
- Artificial Analysis Coding IndexGPT-5.6 Sol by 577.472.4+5
- livebench_languageGPT-5.6 Sol by 4.987.782.8+4.9
- AA-OmniscienceGrok4.5 by 3.32225.3+3.3
- τ³-Bench Bankingtie3333tie
Questions people ask
Which is better, GPT-5.6 Sol or Grok4.5?
GPT-5.6 Sol wins seven of the eight areas we test: coding, agents, reasoning, facts, images and charts, math and long documents. Grok4.5 wins none, but costs 67% less. They are level on following instructions.
Which is better for coding?
GPT-5.6 Sol. It wins 4 of the 6 coding tests both models report; Grok4.5 wins none, and 2 are ties.
Which is cheaper?
GPT-5.6 Sol costs $4.00 per million input tokens and $20.00 per million output tokens; Grok4.5 costs $2.00 and $6.00. That makes Grok4.5 about 67% cheaper for the same work.
How do you compare the two?
We use the 40 benchmark tests both models have published scores on. The verdict counts the 27 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 13 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.