GPT-5.5 vs Grok 4.6
Wins 5 of 8 areas
Reasoning · Facts · Images and charts · Math · Long documents
Wins 3 of 8 areas
Coding · Agents · Following instructions
GPT-5.5 is the stronger all-rounder.Grok 4.6 is cheaper and better at agents.
Both rank among the ten best models we track in reasoning.
Scores updated · 33 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.
- MathCompetition and research-level math30GPT-5.53 of 3 tests
- ReasoningHard problems that need careful thinking32GPT-5.53 of 7 tests · 2 ties
- FactsGetting facts right instead of making them up21GPT-5.52 of 3 tests
- Images and chartsUnderstanding pictures, charts and video10GPT-5.51 of 1 test
- Long documentsFinding answers in very long texts10GPT-5.51 of 1 test
- AgentsCarrying out multi-step tasks on its own04Grok 4.64 of 4 tests
- CodingWriting and fixing software23Grok 4.63 of 5 tests
- Following instructionsDoing exactly what it is asked01Grok 4.61 of 1 test
Images and charts, 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.
Grok 4.6 costs 77% 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-5.5 pulls ahead
- Extremely hard research-level math problemsFrontierMath Tier 4+40.8points ahead
- Unpublished advanced math problemsFrontierMath Tiers 1-3 (v2)+19.3points ahead
- Abstract visual puzzles that people can solveARC-AGI-2+17.9points ahead
Where Grok 4.6 pulls ahead
- Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+65points ahead
- Long professional tasks in banking, consulting and lawAA ApexAgents+19.8points ahead
- Real work tasks from 44 professionsGDPVal+14.6points ahead
Every test, side by side
All 33 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingGrok 4.6
- LMArena · WebDevGrok 4.6 by 104 rating points15131617+104 rating
- LiveBench · CodingGPT-5.5 by 5.482.276.8+5.4
- Terminal-Bench 2.1Grok 4.6 by 3.784.388+3.7
- LiveBench · Agentic CodingGrok 4.6 by 35457+3
- SciCodeGPT-5.5 by 2.855.853+2.8
AgentsGrok 4.6
- AA ApexAgentsGrok 4.6 by 19.837.757.5+19.8
- GDPValGrok 4.6 by 14.642.757.3+14.6
- τ-Bench V3 · BankingGrok 4.6 by 4.33943.3+4.3
- Terminal-Bench 4.0Grok 4.6 by 2.614.617.2+2.6
ReasoningGPT-5.5
- ARC-AGI-2GPT-5.5 by 17.98567.1+17.9
- CritPtGPT-5.5 by 7.427.119.7+7.4
- SimpleBenchGrok 4.6 by 6.96975.9+6.9
- ARC-AGI-3Grok 4.6 by 1.70.42.1+1.7
- Humanity's Last ExamGPT-5.5 by 1.745.844.1+1.7
- LiveBench · Reasoningtie89.790.5tie
- GPQA Diamondtie93.593.5tie
FactsGPT-5.5
- AA-Omniscience · Non-hallucinationGrok 4.6 by 651176+65
- AA-Omniscience · AccuracyGPT-5.5 by 155843+15
- SimpleQA VerifiedGPT-5.5 by 14.16348.9+14.1
Images and chartsGPT-5.5
- LMArena · VisionGPT-5.5 by 27 rating points12921265+27 rating
MathGPT-5.5
- FrontierMath Tier 4GPT-5.5 by 40.872.531.7+40.8
- FrontierMath Tiers 1-3 (v2)GPT-5.5 by 19.385.366+19.3
- LiveBench · MathematicsGPT-5.5 by 3.395.992.6+3.3
Following instructionsGrok 4.6
- LiveBench · Instruction FollowingGrok 4.6 by 1.270.771.9+1.2
Other results8 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.
- AA Agentic IndexGrok 4.6 by 15.437.352.7+15.4
- AA-OmniscienceGrok 4.6 by 8.820.529.3+8.8
- ARC-AGI-1GPT-5.5 by 89587+8
- livebench_data_analysisGPT-5.5 by 7.781.673.9+7.7
- AA IntelligenceGrok 4.6 by 5.838.444.2+5.8
- livebench_languageGPT-5.5 by 3.787.483.7+3.7
- DeepSWE 1.1GPT-5.5 by 1.16765.9+1.1
- Artificial Analysis Coding IndexGrok 4.6 by 174.975.9+1
Questions people ask
Which is better, GPT-5.5 or Grok 4.6?
GPT-5.5 wins five of the eight areas we test: reasoning, facts, images and charts, math and long documents. Grok 4.6 wins coding, agents and following instructions, and costs 77% less.
Which is better for coding?
Grok 4.6. It wins 3 of the 5 coding tests both models report; GPT-5.5 wins 2.
Which is cheaper?
GPT-5.5 costs $5.00 per million input tokens and $30.00 per million output tokens; Grok 4.6 costs $2.00 and $6.00. That makes Grok 4.6 about 77% cheaper for the same work.
How do you compare the two?
We use the 33 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 8 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.