GPT-5.2 vs Grok 4.1 Fast
Wins 8 of 8 areas
Coding · Agents · Reasoning · Facts · Images and charts · Math · Long documents · Following instructions
Wins 0 of 8 areas
—
GPT-5.2 is the stronger all-rounder.Grok 4.1 Fast is cheaper.
Scores updated · 27 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 software30GPT-5.23 of 3 tests
- ReasoningHard problems that need careful thinking31GPT-5.23 of 4 tests
- Images and chartsUnderstanding pictures, charts and video20GPT-5.22 of 2 tests
- MathCompetition and research-level math20GPT-5.22 of 2 tests
- FactsGetting facts right instead of making them up21GPT-5.22 of 3 tests
- AgentsCarrying out multi-step tasks on its own10GPT-5.21 of 1 test
- Long documentsFinding answers in very long texts10GPT-5.21 of 1 test
- Following instructionsDoing exactly what it is asked10GPT-5.21 of 1 test
Agents, 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 4.1 Fast costs 96% 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-5.2 pulls ahead
- Real work tasks from 44 professionsGDPVal+34.2points ahead
- Hard command-line tasks in a real terminalTerminal-Bench Hard+22.8points ahead
- Follows unfamiliar, precisely checkable instructionsIFBench+22.7points ahead
Where Grok 4.1 Fast pulls ahead
- Common-sense trick questionsSimpleBench+10.2points ahead
- Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+7.8points ahead
Every test, side by side
All 27 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingGPT-5.2
- Terminal-Bench HardGPT-5.2 by 22.84724.2+22.8
- LMArena · WebDevGPT-5.2 by 176 rating points14161240+176 rating
- SciCodeGPT-5.2 by 7.952.144.2+7.9
ReasoningGPT-5.2
- Humanity's Last ExamGPT-5.2 by 18.437.719.3+18.4
- SimpleBenchGrok 4.1 Fast by 10.245.856+10.2
- CritPtGPT-5.2 by 8.711.62.9+8.7
- GPQA DiamondGPT-5.2 by 590.385.3+5
FactsGPT-5.2
- AA-Omniscience · AccuracyGPT-5.2 by 19.244.325.1+19.2
- Vectara HHEM hallucination ratelower is betterGPT-5.2 by 8.410.819.2+8.4
- AA-Omniscience · Non-hallucinationGrok 4.1 Fast by 7.818.826.6+7.8
Images and chartsGPT-5.2
- MMMU-ProGPT-5.2 by 11.374.663.3+11.3
- LMArena · VisionGPT-5.2 by 45 rating points12461201+45 rating
MathGPT-5.2
- HMMT Feb. 2026GPT-5.2 by 10.69786.4+10.6
- AIME 2026GPT-5.2 by 4.198.394.2+4.1
Other results10 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.
- Artificial Analysis Coding IndexGPT-5.2 by 29.248.719.5+29.2
- AA-OmniscienceGPT-5.2 by 29-0.9-29.9+29
- AA Agentic IndexGPT-5.2 by 27.360.232.9+27.3
- matharena_visual_math_overallGPT-5.2 by 17.586.569+17.5
- AA IntelligenceGPT-5.2 by 1030.420.4+10
- vectara_avg_summary_lengthGPT-5.2 by 86.8 rating points186.399.5+86.8 rating
- τ²-Bench Telecom (AA run)Grok 4.1 Fast by 8.584.893.3+8.5
- vectara_factual_consistencyGPT-5.2 by 8.489.280.8+8.4
- HMMT Nov. 2025GPT-5.2 by 2.595.893.3+2.5
- vectara_answer_ratetie10099.7tie
Questions people ask
Which is better, GPT-5.2 or Grok 4.1 Fast?
GPT-5.2 wins all eight areas we test: coding, agents, reasoning, facts, images and charts, math, long documents and following instructions. Grok 4.1 Fast wins none, but costs 96% less.
Which is better for coding?
GPT-5.2. It wins 3 of the 3 coding tests both models report; Grok 4.1 Fast wins none.
Which is cheaper?
GPT-5.2 costs $1.75 per million input tokens and $14.00 per million output tokens; Grok 4.1 Fast costs $0.20 and $0.50. That makes Grok 4.1 Fast about 96% cheaper for the same work.
How do you compare the two?
We use the 27 benchmark tests both models have published scores on. The verdict counts the 17 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 10 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.